Tensile testing is used to determine the strength and ductility of materials. A specimen is placed in grips and pulled apart under increasing tensile force while measuring elongation. The resulting stress-strain curve provides properties like yield strength, tensile strength, and Young's modulus. Tensile tests are important for engineering design and quality control by ensuring materials can withstand expected loads and comparing new materials. Common applications include testing aircraft components, bolts, and other loaded structures.
The document discusses key concepts related to elastic, homogeneous, and isotropic materials including: limits of proportionality and elasticity, yield limit, ultimate strength, strain hardening, proof stress, and the stress-strain relationships of ductile and brittle materials. It provides definitions and examples for each term and describes the stress-strain graphs for ductile materials like mild steel and brittle materials.
This experiment tested the tensile properties of steel, aluminum, and two polymeric materials. Specimens of each material were pulled apart in a tensile testing machine at a constant strain rate to measure properties like yield strength, tensile strength, and elongation. The engineering stress-strain and true stress-strain curves were plotted and compared for each material. Values for properties like Young's modulus, yield stress, and tensile strength were determined from the curves and compared to literature values. Sources of experimental error were also discussed.
The document discusses how to determine the mechanical properties of a material from a stress-strain curve generated by a uniaxial tensile test. A cylindrical material sample is placed in a tensile testing machine and force is applied to elongate the sample while measuring changes in length. A graph of applied stress versus strain is generated and used to identify properties like proportional limit, elastic limit, yield strength, ultimate strength, and modulus of elasticity. The stress-strain curve also indicates whether a material is brittle or ductile based on its percent elongation. Mechanical properties determined from this process guide material selection based on strength, stiffness, and ductility requirements.
This document discusses the 3-point flexural test, which measures the flexural properties of materials. In a 3-point flexural test, a specimen is placed on two supporting pins and a loading pin is applied in the middle. Calculations are performed to determine flexural stress, strain, and modulus based on the load and deflection measurements. The test provides values for modulus of elasticity in bending, flexural stress, flexural strain, and flexural stress-strain response. It is a common test for evaluating a material's stiffness when flexed.
The document discusses compression and torsion testing. Compression testing involves applying compressive pressure to a test specimen to determine its strength and stiffness under crushing loads. Torsion testing involves twisting a cylindrical specimen to measure its behavior under torsional forces and determine properties like shear modulus. Both tests are useful for obtaining mechanical properties of materials and evaluating their performance under different types of stresses.
Stress strain curve for ductile and brittle materialsHebron Ramesh
1) Hooke's law states that stress is proportional to strain within the elastic limit, with the constant of proportionality being Young's modulus.
2) Young's modulus (E) is typically 210 GPa for steel and describes the relationship between stress and strain in both tension and compression.
3) The stress-strain curve is unique for each material and shows the deformation (strain) at different levels of loading (stress).
Tensile testing is used to determine the strength and ductility of materials. A specimen is placed in grips and pulled apart under increasing tensile force while measuring elongation. The resulting stress-strain curve provides properties like yield strength, tensile strength, and Young's modulus. Tensile tests are important for engineering design and quality control by ensuring materials can withstand expected loads and comparing new materials. Common applications include testing aircraft components, bolts, and other loaded structures.
The document discusses key concepts related to elastic, homogeneous, and isotropic materials including: limits of proportionality and elasticity, yield limit, ultimate strength, strain hardening, proof stress, and the stress-strain relationships of ductile and brittle materials. It provides definitions and examples for each term and describes the stress-strain graphs for ductile materials like mild steel and brittle materials.
This experiment tested the tensile properties of steel, aluminum, and two polymeric materials. Specimens of each material were pulled apart in a tensile testing machine at a constant strain rate to measure properties like yield strength, tensile strength, and elongation. The engineering stress-strain and true stress-strain curves were plotted and compared for each material. Values for properties like Young's modulus, yield stress, and tensile strength were determined from the curves and compared to literature values. Sources of experimental error were also discussed.
The document discusses how to determine the mechanical properties of a material from a stress-strain curve generated by a uniaxial tensile test. A cylindrical material sample is placed in a tensile testing machine and force is applied to elongate the sample while measuring changes in length. A graph of applied stress versus strain is generated and used to identify properties like proportional limit, elastic limit, yield strength, ultimate strength, and modulus of elasticity. The stress-strain curve also indicates whether a material is brittle or ductile based on its percent elongation. Mechanical properties determined from this process guide material selection based on strength, stiffness, and ductility requirements.
This document discusses the 3-point flexural test, which measures the flexural properties of materials. In a 3-point flexural test, a specimen is placed on two supporting pins and a loading pin is applied in the middle. Calculations are performed to determine flexural stress, strain, and modulus based on the load and deflection measurements. The test provides values for modulus of elasticity in bending, flexural stress, flexural strain, and flexural stress-strain response. It is a common test for evaluating a material's stiffness when flexed.
The document discusses compression and torsion testing. Compression testing involves applying compressive pressure to a test specimen to determine its strength and stiffness under crushing loads. Torsion testing involves twisting a cylindrical specimen to measure its behavior under torsional forces and determine properties like shear modulus. Both tests are useful for obtaining mechanical properties of materials and evaluating their performance under different types of stresses.
Stress strain curve for ductile and brittle materialsHebron Ramesh
1) Hooke's law states that stress is proportional to strain within the elastic limit, with the constant of proportionality being Young's modulus.
2) Young's modulus (E) is typically 210 GPa for steel and describes the relationship between stress and strain in both tension and compression.
3) The stress-strain curve is unique for each material and shows the deformation (strain) at different levels of loading (stress).
This document discusses tensile testing and universal testing machines. It defines tensile testing as applying opposing tensile forces to a test specimen to measure the specimen's properties. A universal testing machine typically uses a hydraulic cylinder to apply the force. The document lists several material properties that can be determined from tensile tests, including strength, ductility, elasticity, and stiffness. It provides diagrams illustrating how properties like tensile strength, modulus of elasticity, and breaking stress are calculated from the stress-strain graph generated during tensile testing. Finally, it gives some examples of industries that use tensile testing, like aerospace and textiles, and notes benefits like determining batch quality and aiding design.
The document discusses a presentation on a universal testing machine. It describes how the machine is used to apply tensile, compressive, and shear forces to test materials and measure their properties. It explains that the machine uses load cells, crossheads, and columns to grip specimens and apply and measure forces. The document outlines the working principle of the machine and procedures for tensile and compression tests.
This document gives the class notes of Unit 2 stresses in composite sections. Subject: Mechanics of materials.
Syllabus contest is as per VTU, Belagavi, India.
Notes Compiled By: Hareesha N Gowda, Assistant Professor, DSCE, Bengaluru-78.
This document provides an overview of basic concepts in strength of materials including definitions of mass, weight, area, volume, force, and Newton's laws of motion. It defines stress as resistive force per unit area and strain as the ratio of deformation to original dimensions. Examples of basic mechanical properties like elasticity, plasticity, and ductility are described. Stress is defined using the formula of resistive force over cross-sectional area and strain is defined as the change in dimensions over original dimensions. Common stress units like Pascal, kiloPascal, megaPascal, and gigapascal are also outlined.
The document discusses different hardness testing methods including Brinell hardness testing and Rockwell hardness testing. Brinell hardness testing involves pressing an indenter ball into the surface of a metal under a load and measuring the diameter of the indentation. Rockwell hardness testing measures the additional depth of a heavy load indenter beyond the depth of a previously applied light load. Both tests provide standardized hardness values and have advantages such as being simple and quick to perform.
This document discusses impact testing techniques used to evaluate the fracture behavior of materials. It provides background on impact testing and describes the Charpy and Izod impact tests. These tests involve fracturing a notched specimen using a swinging pendulum. The absorbed energy is measured and used to determine the ductile to brittle transition temperature (DBTT) of the material. The DBTT curve shows how absorbed energy and fracture surface morphology change with temperature. Factors that influence the DBTT, such as chemical composition, grain size, and heat treatment are also reviewed. Experimental procedures for conducting impact tests at different temperatures are outlined.
This document provides instructions for conducting a tensile test to determine the mechanical properties of polymers. A tensile test involves gripping a dogbone-shaped polymer specimen at both ends and pulling it at a constant rate until failure. Key points:
- Stress-strain curves are generated from the test, showing properties like elastic modulus, yield point, and toughness.
- Properties depend on factors like crystallinity, molecular weight, and glass transition temperature. Brittle polymers have steeper stress-strain curves.
- The test procedure involves preparing specimens to standards, setting up the tensile testing machine and software to control displacement rate and record data, calibrating load cells, gripping the specimen, and conducting the
This document summarizes various common material testing methods. It discusses tensile, compression, shear, hardness (Brinell, Vickers, Rockwell), impact (Izod, Charpy), fatigue, and creep tests. Destructive tests like tensile and compression change the specimen, while hardness tests are non-destructive. Important properties determined include yield strength, tensile strength, and modulus of elasticity. Hardness is a material's resistance to indentation or scratching. Impact and fatigue tests evaluate a material's ability to withstand sudden loads or repeated loading over time. Creep tests measure increased deformation over time under constant stress and temperature.
Strength of Materials also called mechanics of materials, is a subject which deals with behavior of solid objects subjected to stresses and strains.
The Strength of Materials is subject, which refers to various methods for calculating the stresses and strains in structural members such as beams, columns and shafts. The methods employed to predict the response of structure under loading.
This document discusses various methods for testing materials, including destructive and non-destructive testing. It provides details on hardness testing methods like Rockwell and Brinell, as well as impact testing methods like Izod and Charpy. Specifically, it compares the Izod and Charpy impact testing methods, noting that Izod places the test material vertically and has a single notch type, while Charpy places the material horizontally and uses either a V-notch or U-notch. The document also briefly outlines tensile testing.
The Charpy impact test determines the impact toughness or strength of a material by measuring the energy absorbed when a pendulum strikes a V-notched specimen. Testing was conducted on specimens at room temperature (24.3°C) and -40°C. The room temperature specimen absorbed more energy (17.33J) and was more ductile, while the -40°C specimen absorbed less energy (2.10J) and was more brittle. Impact toughness depends on temperature, with materials becoming more brittle at lower temperatures.
This document provides an overview of tensile testing. It discusses tensile specimens, testing machines, stress-strain curves, and key mechanical properties measured by tensile tests such as strength, ductility, and elastic modulus. Tensile tests are used to select materials, ensure quality, compare new materials/processes, and predict behavior under other loads. Stress-strain curves are generated by applying tension to a specimen and recording the resulting force and elongation. Important aspects of the curves, like yield strength and plastic deformation, are defined.
Group presentation for tensile testing a4Prajwal Vc
The document describes the methodology, instrumentation, and results of tensile testing experiments on various metal samples. The methodology involved determining sample dimensions, marking intervals on the samples, setting up the tensile testing equipment which includes an extensometer and Hounsfield testing machine, applying and increasing load while recording extension and results. Graphs of stress-strain responses were produced for aluminum, brass, and mild steel samples, showing their different mechanical behaviors under tensile loading. Key properties of each metal were also discussed.
The document discusses two common impact tests: the Charpy and Izod impact tests. The Charpy test involves dropping a pendulum onto a notched sample to measure the energy absorbed during fracture. It is used to evaluate toughness and notch sensitivity, especially of metals. The Izod test also measures energy absorbed during fracture but holds the sample in a cantilevered beam configuration rather than three-point bending. Both tests are useful for determining the strength and ductility of materials, especially their ability to withstand shocks and impacts in applications like forging, rubber products, and plastics.
The document discusses plasticity theory and yield criteria. It introduces Hooke's law and its limitations under large strains. Generalized Hooke's law is presented for isotropic and anisotropic materials. Common stress-strain curves are shown including elastic-plastic and strain hardening responses. Several yield criteria are covered, including maximum principal stress, Tresca, and von Mises criteria. The von Mises criterion uses a second invariant of stress to predict yielding of ductile materials. An example compares predictions of yielding using Tresca and von Mises criteria for a given stress state in aluminum.
1. The document discusses four common failure theories used in engineering: maximum shear stress theory, maximum principal stress theory, maximum normal strain theory, and maximum shear strain theory.
2. It provides details on the maximum shear stress (Tresca) theory, which states that failure occurs when the maximum shear stress equals the yield point stress under simple tension.
3. An example problem is presented involving determining the required diameter of a circular shaft using the maximum shear stress theory with a safety factor of 3, given the material properties and loads on the shaft.
This document provides an introduction and overview of mechanics of materials. It defines key terms like stress, strain, normal stress, shear stress, factor of safety, and allowable stress. It also gives examples of calculating stresses in structural members subjected to various loads. The document is an introductory reading for a mechanics of materials course that will analyze the relationship between external forces and internal stresses and strains in structural elements.
Tensile testing subjects a material sample to controlled tension until failure to determine properties like ultimate tensile strength and elongation. The test uses a universal testing machine to apply tension to a standardized tensile specimen, measuring properties like modulus of elasticity, yield stress, and fracture stress. The test procedure involves securing the specimen in the machine and applying tension until failure while recording the stress-strain curve.
This document summarizes key concepts about fatigue failure from variable loading from Shigley's Mechanical Engineering Design textbook. It discusses that fluctuating stresses over long periods of time can cause failure at stress levels lower than ultimate strength. Fatigue failure occurs in three stages: microcrack development, crack growth, and sudden fracture. Fatigue cracks initiate at locations of stress concentrations like holes or notches. The document presents three methods for predicting fatigue life: the stress-life method, strain-life method, and fracture mechanics method. It also discusses modifying factors for determining endurance limits and fatigue strength values accounting for effects of surface finish, size, temperature, reliability, and stress concentrations.
The document summarizes different mechanical testing methods and non-destructive testing techniques. It discusses various hardness tests including Brinell, Vickers, Rockwell, and Knoop tests. Impact/toughness tests like Izod and Charpy tests are also covered. Non-destructive methods such as liquid penetrant, magnetic particle, ultrasonic, radiographic, and eddy current inspections are described along with their principles and purposes.
This document discusses tensile testing and universal testing machines. It defines tensile testing as applying opposing tensile forces to a test specimen to measure the specimen's properties. A universal testing machine typically uses a hydraulic cylinder to apply the force. The document lists several material properties that can be determined from tensile tests, including strength, ductility, elasticity, and stiffness. It provides diagrams illustrating how properties like tensile strength, modulus of elasticity, and breaking stress are calculated from the stress-strain graph generated during tensile testing. Finally, it gives some examples of industries that use tensile testing, like aerospace and textiles, and notes benefits like determining batch quality and aiding design.
The document discusses a presentation on a universal testing machine. It describes how the machine is used to apply tensile, compressive, and shear forces to test materials and measure their properties. It explains that the machine uses load cells, crossheads, and columns to grip specimens and apply and measure forces. The document outlines the working principle of the machine and procedures for tensile and compression tests.
This document gives the class notes of Unit 2 stresses in composite sections. Subject: Mechanics of materials.
Syllabus contest is as per VTU, Belagavi, India.
Notes Compiled By: Hareesha N Gowda, Assistant Professor, DSCE, Bengaluru-78.
This document provides an overview of basic concepts in strength of materials including definitions of mass, weight, area, volume, force, and Newton's laws of motion. It defines stress as resistive force per unit area and strain as the ratio of deformation to original dimensions. Examples of basic mechanical properties like elasticity, plasticity, and ductility are described. Stress is defined using the formula of resistive force over cross-sectional area and strain is defined as the change in dimensions over original dimensions. Common stress units like Pascal, kiloPascal, megaPascal, and gigapascal are also outlined.
The document discusses different hardness testing methods including Brinell hardness testing and Rockwell hardness testing. Brinell hardness testing involves pressing an indenter ball into the surface of a metal under a load and measuring the diameter of the indentation. Rockwell hardness testing measures the additional depth of a heavy load indenter beyond the depth of a previously applied light load. Both tests provide standardized hardness values and have advantages such as being simple and quick to perform.
This document discusses impact testing techniques used to evaluate the fracture behavior of materials. It provides background on impact testing and describes the Charpy and Izod impact tests. These tests involve fracturing a notched specimen using a swinging pendulum. The absorbed energy is measured and used to determine the ductile to brittle transition temperature (DBTT) of the material. The DBTT curve shows how absorbed energy and fracture surface morphology change with temperature. Factors that influence the DBTT, such as chemical composition, grain size, and heat treatment are also reviewed. Experimental procedures for conducting impact tests at different temperatures are outlined.
This document provides instructions for conducting a tensile test to determine the mechanical properties of polymers. A tensile test involves gripping a dogbone-shaped polymer specimen at both ends and pulling it at a constant rate until failure. Key points:
- Stress-strain curves are generated from the test, showing properties like elastic modulus, yield point, and toughness.
- Properties depend on factors like crystallinity, molecular weight, and glass transition temperature. Brittle polymers have steeper stress-strain curves.
- The test procedure involves preparing specimens to standards, setting up the tensile testing machine and software to control displacement rate and record data, calibrating load cells, gripping the specimen, and conducting the
This document summarizes various common material testing methods. It discusses tensile, compression, shear, hardness (Brinell, Vickers, Rockwell), impact (Izod, Charpy), fatigue, and creep tests. Destructive tests like tensile and compression change the specimen, while hardness tests are non-destructive. Important properties determined include yield strength, tensile strength, and modulus of elasticity. Hardness is a material's resistance to indentation or scratching. Impact and fatigue tests evaluate a material's ability to withstand sudden loads or repeated loading over time. Creep tests measure increased deformation over time under constant stress and temperature.
Strength of Materials also called mechanics of materials, is a subject which deals with behavior of solid objects subjected to stresses and strains.
The Strength of Materials is subject, which refers to various methods for calculating the stresses and strains in structural members such as beams, columns and shafts. The methods employed to predict the response of structure under loading.
This document discusses various methods for testing materials, including destructive and non-destructive testing. It provides details on hardness testing methods like Rockwell and Brinell, as well as impact testing methods like Izod and Charpy. Specifically, it compares the Izod and Charpy impact testing methods, noting that Izod places the test material vertically and has a single notch type, while Charpy places the material horizontally and uses either a V-notch or U-notch. The document also briefly outlines tensile testing.
The Charpy impact test determines the impact toughness or strength of a material by measuring the energy absorbed when a pendulum strikes a V-notched specimen. Testing was conducted on specimens at room temperature (24.3°C) and -40°C. The room temperature specimen absorbed more energy (17.33J) and was more ductile, while the -40°C specimen absorbed less energy (2.10J) and was more brittle. Impact toughness depends on temperature, with materials becoming more brittle at lower temperatures.
This document provides an overview of tensile testing. It discusses tensile specimens, testing machines, stress-strain curves, and key mechanical properties measured by tensile tests such as strength, ductility, and elastic modulus. Tensile tests are used to select materials, ensure quality, compare new materials/processes, and predict behavior under other loads. Stress-strain curves are generated by applying tension to a specimen and recording the resulting force and elongation. Important aspects of the curves, like yield strength and plastic deformation, are defined.
Group presentation for tensile testing a4Prajwal Vc
The document describes the methodology, instrumentation, and results of tensile testing experiments on various metal samples. The methodology involved determining sample dimensions, marking intervals on the samples, setting up the tensile testing equipment which includes an extensometer and Hounsfield testing machine, applying and increasing load while recording extension and results. Graphs of stress-strain responses were produced for aluminum, brass, and mild steel samples, showing their different mechanical behaviors under tensile loading. Key properties of each metal were also discussed.
The document discusses two common impact tests: the Charpy and Izod impact tests. The Charpy test involves dropping a pendulum onto a notched sample to measure the energy absorbed during fracture. It is used to evaluate toughness and notch sensitivity, especially of metals. The Izod test also measures energy absorbed during fracture but holds the sample in a cantilevered beam configuration rather than three-point bending. Both tests are useful for determining the strength and ductility of materials, especially their ability to withstand shocks and impacts in applications like forging, rubber products, and plastics.
The document discusses plasticity theory and yield criteria. It introduces Hooke's law and its limitations under large strains. Generalized Hooke's law is presented for isotropic and anisotropic materials. Common stress-strain curves are shown including elastic-plastic and strain hardening responses. Several yield criteria are covered, including maximum principal stress, Tresca, and von Mises criteria. The von Mises criterion uses a second invariant of stress to predict yielding of ductile materials. An example compares predictions of yielding using Tresca and von Mises criteria for a given stress state in aluminum.
1. The document discusses four common failure theories used in engineering: maximum shear stress theory, maximum principal stress theory, maximum normal strain theory, and maximum shear strain theory.
2. It provides details on the maximum shear stress (Tresca) theory, which states that failure occurs when the maximum shear stress equals the yield point stress under simple tension.
3. An example problem is presented involving determining the required diameter of a circular shaft using the maximum shear stress theory with a safety factor of 3, given the material properties and loads on the shaft.
This document provides an introduction and overview of mechanics of materials. It defines key terms like stress, strain, normal stress, shear stress, factor of safety, and allowable stress. It also gives examples of calculating stresses in structural members subjected to various loads. The document is an introductory reading for a mechanics of materials course that will analyze the relationship between external forces and internal stresses and strains in structural elements.
Tensile testing subjects a material sample to controlled tension until failure to determine properties like ultimate tensile strength and elongation. The test uses a universal testing machine to apply tension to a standardized tensile specimen, measuring properties like modulus of elasticity, yield stress, and fracture stress. The test procedure involves securing the specimen in the machine and applying tension until failure while recording the stress-strain curve.
This document summarizes key concepts about fatigue failure from variable loading from Shigley's Mechanical Engineering Design textbook. It discusses that fluctuating stresses over long periods of time can cause failure at stress levels lower than ultimate strength. Fatigue failure occurs in three stages: microcrack development, crack growth, and sudden fracture. Fatigue cracks initiate at locations of stress concentrations like holes or notches. The document presents three methods for predicting fatigue life: the stress-life method, strain-life method, and fracture mechanics method. It also discusses modifying factors for determining endurance limits and fatigue strength values accounting for effects of surface finish, size, temperature, reliability, and stress concentrations.
The document summarizes different mechanical testing methods and non-destructive testing techniques. It discusses various hardness tests including Brinell, Vickers, Rockwell, and Knoop tests. Impact/toughness tests like Izod and Charpy tests are also covered. Non-destructive methods such as liquid penetrant, magnetic particle, ultrasonic, radiographic, and eddy current inspections are described along with their principles and purposes.
This document describes an experiment on tensile testing of materials. It discusses preparing dog-bone shaped samples according to ASTM D638 standards. Tensile testing is done using a Shimadzu tensile testing machine to measure properties like stress and strain. Careful sample preparation and dimensions matching standards are needed to obtain accurate property values from the experiment. The conclusions emphasize getting the right sample dimension values according to standards to determine material properties correctly.
This document describes an experiment on tensile testing of materials. It discusses preparing dog-bone shaped samples according to ASTM D638 standards. Tensile testing is done using a Shimadzu tensile testing machine to measure properties like stress and strain. Careful sample preparation and dimensions matching standards are needed to obtain accurate property values from the experiment. The conclusions emphasize getting the right sample dimension values according to standards to determine material properties correctly.
This is my Lab Report of Tensile Test when I was conducting engineering material lab in Sampoerna University. Feel free to download for a reference.
I know it is not a good report, but I hope this share might help you to find something you need.
Thank you.
This lab report summarizes a compression test experiment conducted to determine the mechanical properties of a metal alloy sample. The experiment involved compressing the sample between two plates using a universal testing machine while measuring stress and strain. The results showed the stress-strain curve for the material and identified its maximum compression strength. The objective was to learn how materials behave under compressive loads and determine properties like elastic modulus, yield point, and ultimate strength.
This lab report summarizes a compression test experiment conducted to determine the mechanical properties of a metal alloy sample. The experiment involved compressing the sample between two plates using a universal testing machine while measuring stress and strain. The results showed the stress-strain curve for the material and identified its maximum compression strength. The objective was to learn how materials behave under compressive loads and determine properties like elastic modulus, yield point, and ultimate strength.
Hammad Shoaib submitted a lab report for the Mechanics of Solids course to determine various mechanical properties of materials through tensile and bend tests. The report describes procedures to develop a stress-strain curve for steel rebar and determine its yield strength, ultimate strength, modulus of elasticity, and percentage elongation. Additional experiments include a bend test to examine ductility and a tensile test on wood to find compressive strengths parallel and perpendicular to the grain.
This document describes an experiment to determine the deflection and bending stress of a cantilever beam. A cantilever beam is clamped at one end and free at the other. Deflection measurements are taken at the free end as loads are applied. The deflection values are used to calculate the beam's Young's modulus and bending strength based on equations that relate deflection to the beam's properties and loading. Proper measurement techniques and safety precautions are outlined to ensure accurate results. The experiment is designed to analyze beam behavior under bending loads.
This document summarizes a laboratory report on testing the elastic behavior of steel beams. Strain gauges were attached to steel beams and they were loaded at their center point to induce stress. The strain readings from the gauges and load levels were recorded. Stress-strain curves were plotted and the modulus of elasticity was calculated from the slope of the linear elastic region. The experimentally determined modulus was found to be 29.96*106 psi, close to the accepted value of 29*106 psi, demonstrating steel's predictable elastic behavior.
Experiment 4 - Testing of Materials in Tension Object .docxSANSKAR20
Experiment 4 - Testing of Materials in Tension
Object: The object of this experiment is to measure the tensile properties of two polymeric
materials, steel and aluminum at a constant strain rate on the Tension testing machine.
Background: For structural applications of materials such as bridges, pressure vessels, ships,
and automobiles, the tensile properties of the metal material set the criteria for a safe design.
Polymeric materials are being used more and more in structural applications, particularly in
automobiles and pressure vessels. New applications emerge as designers become aware of
the differences in the properties of metals and polymers and take full advantage of them. The
analyses of structures using metals or plastics require that the data be available.
Stress-Strain: The tensile properties of a material are obtained by pulling a specimen of
known geometry apart at a fixed rate of straining until it breaks or stretches to the machines
limit. It is useful to define the load per unit area (stress) as a parameter rather than load to
avoid the confusion that would arise from the fact that the load and the change in length are
dependent on the cross-sectional area and original length of the specimen. The stress,
however, changes during the test for two reasons: the load increases and the cross-sectional
area decreases as the specimen gets longer.
Therefore, the stress can be calculated by two formulae which are distinguished as
engineering stress and true stress, respectively.
(1) = P/Ao= Engineering Stress (lbs/in
2 or psi)
P = load (lbs)
Ao= original cross-sectional area (in
2)
(2) T= P/Ai = True Stress
Ai = instantaneous cross-sectional area (in
2)
Likewise, the elongation is normalized per unit length of specimen and is called strain. The
strain may be based on the original length or the instantaneous length such that
(3) =(lf - lo)/ lo = l / lo = Engineering Strain, where
lf= final gage length (in)
lo= original gage length (in)
(4) T= ln ( li / lo ) = ln (1 +) = True Strain, where
li = instantaneous gage length (in)
ln = natural logarithm
For a small elongation the engineering strain is very close to the true strain when l=1.2 lo,
then = 0.2 and T= ln 1.2 = 0.182. The engineering stress is related to the true stress by
(5) T= (1 + )
The true stress would be 20% higher in the case above where the specimen is 20% longer
than the original length. As the relative elongation increases, the true strain will become
significantly less than the engineering strain while the true stress becomes much greater than
the engineering stress. When l= 4.0 lo then = 3.0 but the true strain =ln 4.0 = 1.39.
Therefore, the true strain is less than 1/2 of the engineering strain. The true stress (T) = (1+
3.0) = 4, or the true stress is 4 times the engineering stress.
Tensile Test Nom ...
The document describes a tensile test experiment conducted to determine the mechanical properties of mild steel. The experiment involved applying a tensile load to a mild steel specimen and measuring its elongation. Key results were:
1) The specimen necked at a load of just over 8kN, exceeding its elastic limit.
2) The maximum load of 12kN caused necking in the specimen.
3) The specimen fractured at a load of 8.9kN after continued elongation beyond the maximum load.
4) Results from the experiment matched the expected mechanical behavior of mild steel under tension, validating the initial hypothesis.
Strength of material lab, Exp 3&4: Compression and impact testsOsaid Qasim
- Utilization the UTM machine and know the different
ways that could test the material’s properties.
2- Knowing the different types of failure in the compression.
3- Determining Young's modulus “E” and Passion’s ratio
“υ” and Yield/Proof stress σ y.
1. Finding the impact load effect on the materials.
2. Finding the relative toughness of the different materials.
3. Distinguish between static and dynamic loads and how differently they
effect in the material.
4.Knowing the different methods to preform the impact test (Charpy,
IZOD, Impact tensile).
Uniaxial tension test is used to determine yield strength, Young’s modulus, Poisson’s ratio, true stress-strain. Finite element analysis, Kartik Srinivas
Thesis - Design a Planar Simple Shear Test for Characterizing Large Strange B...Marshal Fulford
This document presents the results of a finite element analysis of a tensile loaded shear sample used to characterize the large strain behavior of sheet metals. The analysis validated that the gauge section experiences a state of simple shear. Additional simulations examined the effects of mesh sensitivity, fillets in the gauge section corners to reduce stress concentrations, and a smaller gauge section aspect ratio. The tensile loaded shear sample was concluded to produce a simple shear state in the gauge section.
Finite Element Analysis and Natural Modes InvestigationStasik Nemirovsky
Mechanical Vibrations - MECH 315.
In this project, a structural I-Beam was analyzed in order to find it's natural frequencies and modes. The analysis was performed using the the FEA software ABAQUS.
1) Tensile tests were conducted on four materials: A-36 steel, 6061-T6 aluminum, polycarbonate, and PMMA. The tests determined properties like ultimate tensile strength, modulus of elasticity, and yield strength.
2) A-36 steel had the highest ultimate tensile strength and true fracture strength, while 6061-T6 aluminum had a higher yield strength than steel. Polycarbonate was the most ductile.
3) Engineering stress-strain curves were plotted from the test data and used to calculate material properties like modulus of resilience and toughness.
Tensile, Impact and Hardness Testing of Mild SteelGulfam Hussain
The main purpose of this report is to study the mechanical properties and
failure mode of mild steel. Three types of standard tests i.e. tensile test, impact
test, and hardness test were conducted on the standard specimens of mild steel.
From the tests, results were obtained; Tensile strength, Impact strength, and
hardness were calculated. It was observed that Tensile Strength, Impact Strength
and Hardness of MS specimen were 1450.833 N/mm², 29.5 J & 59.25 HRB.
Similar to 0 exp no.4 bending test experiment (20)
This document describes an experiment conducted to demonstrate and measure fluid flow rates using different flow meter types. The experiment utilized a hydraulic bench unit with various components like a volumetric measuring tank and submersible pump. Three common flow meters - a rotameter, venture meter, and orifice plate - were used to measure the flow rate of water. The procedure involved taking readings from the flow meters and hydraulic bench at different flow rates. These readings were then used to calculate the actual flow rates and discharge coefficients for each meter. Graphs were made to analyze the relationships between actual and indicated flow rates and how the venture meter's discharge coefficient changed with actual flow rate.
1. The experiment aimed to dilute a drilling mud from 8.65 ppg to 8.45 ppg by adding 666.66 cc of water incrementally and measuring the mud weight each time.
2. Errors in the experiment likely contributed to the measured mud density being 8.45 ppg instead of the target 8.5 ppg, including impurities in the water, inaccurate measurements, and bentonite losses during mixing and weighing.
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0 exp no.4 bending test experiment
1. 1
Faculty of Engineering Petroleum
Engineering Department
Mechanics of Material Laboratory, 2nd stage
Experiment Name: Bending test experiment
Prepared by: Muhammed Fuad Rashid
Ahmad Jalal Hassan
Muhammad Hassan Aziz
Safwan Tofiq Ameen
Group: A
Supervised by: Dr.Diyar
2. 2
Contents
1.Introduction.............................................................................................................................3
2. Aim of the test ........................................................................................................................5
3. Methodology...........................................................................................................................6
3.1. Sample preparation..........................................................................................................6
3.2. test machine.....................................................................................................................7
3.3. Test proceeding................................................................................................................8
4.Results and discussion............................................................................................................10
4.1. data obtained (from the graph) ......................................................................................12
4.2. Data obtained (from calculations)...................................................................................14
4.3. Discussion.......................................................................................................................15
6.References:............................................................................................................................17
3. 3
1.Introduction
Bend testing, sometimes called flexure testing or transverse beam
testing, measures the behavior of materials subjected to simple
beam loading. It is commonly performed on relatively flexible
materials such as polymers, wood, and composites. At its most
basic level a bend test is performed by placing a specimen on two
support anvils, which is bent through applied force on 1 or 2 loading
anvils. The force is applied with either a single upper anvil at the
midpoint, which is a 3-point bend test, or two upper anvils
equidistant from the center, a 4-point bend test.
In a 3-point test the area of uniform stress is quite small and
concentrated under the center loading point. In a 4-point test, the
area of uniform stress exists between the inner span loading points
(typically half the length of the outer span). Depending on the type
of material being tested, there are many different flex fixtures that
may be appropriate.
5. 5
2. Aim of the test
Engineers often want to understand various aspects of material’s
behavior, but a simple uniaxial tension or compression test may not
provide all necessary information. As the specimen bends or flexes,
it is subjected to a complex combination of forces including
tension, compression, and shear. For this reason, bend testing is
commonly used to evaluate the reaction of materials to realistic
loading situations. Flexural test data can be particularly useful
when a material is to be used as a support structure. For example,
a plastic chair needs to give support in many directions. While the
legs are in compression when in use, the seat will need to
withstand flexural forces applied from the person seated. Not only
do manufacturers want to provide a product that can hold
expected loads, the material also needs to return to its original
shape if any bending occurs. Precisely we can say the objective is ;
1. To study and examine the flexural properties of materials.
2. To investigate how the dimension and shape of materials affect
the flexural.
3. To develop an understanding about the flexural properties of
materials
6. 6
3. Methodology
3.1. Sample preparation
Bend tests are generally performed on a universal testing
machine using a 3 or 4 point bend fixture. Variables like test speed
and specimen dimensions are determined by the ASTM or ISO
standard being used. Specimens are generally rigid and can be
made of various materials such as plastic, metal, wood, and
ceramics. The most common shapes are rectangular bars and
cylindrical-shaped specimens.
To perform a bending test a specimen of the material is
made into a “standard” shape as it mentioned above.., The sample
preparation of a bending test is just like a tensile test but it differs
from the tensile test from some things for example in bending test
the gage-length of the sample should be subtracted from its end
which is out of the two roller supports that supports the specimen
because the load acts on the load which is between the two
supports till the edge of the supports , thus to obtain the right
values . then we should measure the cross-sectional area of the
sample that means we measure the width and thickness of the
specimen, also the length is necessary and needs to be measured
for the calculations.
our specimen was a steel and had both side cross sectional of
rectangular shape. And the specimen’s composition was(steel) and
its dimension’s is right below, so finally The sample was already
machined to the proper dimensions required for the bending test
experiment, according to ASTM standards.
7. 7
3.2. test machine
A machine is used in bending test experiments to perform the
experiment and our labs machine for bending test have the
specifications and its description below;
Model No. 5982
System ID /SN 5982L33117
Configuration E1-F1-G1
capacity 100KN(2500Ib)
weight 784kg(1732Ib)
Date of manufacture March,21,2012
voltage 220 Volts
frequency 47-63 Hz
Maximum power 3500 VA
Circuit breaker 20Amp
Short circuit current
8. 8
3.3. Test proceeding
First of all after that our specimen was prepared which its
mentioned how prepared in preparation of sample section with its
specification of its dimensions, now the first should be done The
Blue Hill data acquisition software was started and in the final
proceeding of the software’s procedure The load cell acts on the
specimen was zeroed to ensure that the software only measures
the right data that will be obtained from the specimen after that
we sat our specimen on the two supports of the machine which
were both roller supports but with a little distance away from the
edges of the specimen which must be equal from both sides
because the material was longer the place of the two roller
supports (supports the specimen only in one direction) and this was
all done so as to obtain the right values and properties of the
sample, also prevent damage to the machine.
After the sample was connected to the machine the blue hill
software was set to the right options for the specimen’s property
and proceeding the software to prepare for the test but there’s
some need to be mentioned for example, the strain ratio (defined
at definition section) ;
Strain ratio=2mm/minute
And its very important to set the strain ration in a small ratio to
ensure the accurate results and not directly rapture the specimen
.if not then our curve will not give the whole details about the test.
Then, the test was started, and the specimen was load Applied
from the cell, resulting in a measureable readings of the specimen
according to the software after that the load was applied we waited
nearly for 8 minutes and till the sample was fractured and got to
rapture ,what we observed meanwhile was the sample was going
9. 9
to bending position and the sample got to bend(like curve) after a
moments later ,as the axial load increases on the sample finally the
sample at a specific load got to fracture in its bellow part of the
specimen , and that was the final steps of proceeding the
experiment.
10. 10
4.Results and discussion
After the test was produced ,the data was gathered from the
software and obtained the right values on a graph(software’s
proceeding) ,from the graph of the bending stress and strain
diagram,
Figure 1stress strain bending diagram
According to the figure number 1 .we can determine lot of the
specimen’s properties which is the aim of our experiment which
are to determine the following properties of the specimen;
maximum stress
yield strength
-50
0
50
100
150
200
250
1 226 451 676 901 11261351157618012026225124762701292631513376360138264051
flexurestress(MPA)
flexure strain(mm)
stress starin bending diagram
Series1
Series2
12. 12
4.1. data obtained (from the graph)
1-maximum stress; which is the maximum value of stress acted on
the specimen which located on the top or pick of the stress strain
diagram .
Maximum stress= 213.018𝑀𝑃𝑎
2-yield strength; this property of the material can be determined
as the point comes after the elastic limit which means the material
can no longer back to its original shape from the stress strain
diagram .
Yield strength= 182.273𝑀𝑃𝑎
4-modulds of elasticity; the modulus of the specimen can be
obtained from the stress strain diagram by taking the average of
the slopes of the points are in proportional limit from the curve.
First modules of elasticity= 48.89105𝐺𝑃𝑎
Second modules of elasticity= 48.50245𝐺𝑃𝑎
Third modules of elasticity= 48.66540𝐺𝑃𝑎
Average youngs modules=(48.89105 + 48.50245 + 48.66540)/3
= 48.68630𝐺𝑃𝑎
5-Maximum load; can be defined as the maximum load which
applied ay the load cell to the specimen
14. 14
4.2. Data obtained (from calculations)
Maximum stress which we determined it from graph(which was
the top of the curve )
Maximum stress(by calculating)=
3𝑓𝑙
2𝑏𝑑2
𝑙=170𝑚𝑚
𝑏=34𝑚𝑚
𝑑=1.75𝑚𝑚
𝑓(from plot)=91𝑁
𝜎𝑓 = 222.857𝑀𝑃𝑎
15. 15
4.3. Discussion
So as we can see the results are determining the behavior of the
material as it should be to a specimen like steel, the maximum
stress and the young’s modulus determine for us that steels is very
powerful material also has large amount of ductility as result it
resists a larger amount of bending stress than a for example a wood
does , for example they used in making wings of plains because
they bend with out to fracture ,.our specimen in lab nearly it didn’t
fractured at all which means the steel has a good property of
bending that bends at a large distance with out fracturing ,also the
material made of plastic or rubber have also large amount of
flexibility .
16. 16
5.0. Conclusion
And finally the aim of the experiment was successfully done which was to
determine a number of the specimen properties such as maximum stress and
young’s modulus an so on The system functions by using metal bending bars
of varying thickness and stiffness to deform the test specimen. The force
applied is measured by use of a built-in calibration and calculation system , a
data was gathered from performing the experiments which helped us in
many ways to determine the materials properties and to benefits from in our
life in manufacturing of equipments and tools and many more to be used in
our life , so finally I would say bending experiments helps us to understand
more about material and to benefit from them in many ways.
17. 17
6.References:
Instron.us. (2019). What is Bend Testing? - Instron. [online] Available
at: https://www.instron.us/our-company/library/test-types/flexure-
test [Accessed 12 Dec. 2019].
Gilbert, J. A and C. L. Carmen. "Chapter 8 –Flexure Test." MAE/CE 370
–Mechanics of Materials Laboratory Manual. June 2000
Dowling, N.E., Mechanical behaviour of materials: Engineering
methods for deformation, fracture and fatigue, 2nd edition, 1999,
Prentice Hall,ISBN-0-13-010989-4.
Hibbleler,R.C., Mechanics of Materials, SI second edition, 2005,
Prentice Hall, ISBN
0-13-186-638-9