SCC Research Guide
•
2 likes•507 views
This research guide summarizes experiments on stress corrosion cracking using an environmental chamber. Crack growth in load chain and compact tension specimens was measured using direct current potential drop testing to avoid temperature and corrosion issues. U-bend samples were also tested to examine the effects of residual stress rather than applied stress, showing surface stress corrosion cracking over 17 days. Graphs displayed results on varying stress corrosion cracking and pitting rates dependent on environmental and material factors, such as increased temperature and an upper threshold for pitting initiation.
Report
Share
Report
Share
Download to read offline
Recommended
Science portfolio Presentation - Conductors
The document summarizes an experimental design lab report that tested how the conductivity of different materials affected the temperature of water. The experiment tested copper, aluminum, plastic and glass and measured the temperature change of water in each material over 20 minutes. The results showed that copper produced the highest temperature change and fastest heat transfer, while plastic produced almost no change, supporting the hypothesis. The conclusion was that materials with smaller specific heat capacity can transfer thermal energy faster.
Perpindahan Panas Pada Dinding Lapis Bola - Operasi Perpindahan Kalor
Presentasi mengenai materi perpindahan panas pada dinding lapis berbentuk bola. Pada presentasi ini memuat contoh-contoh kasus dari textbook dan sumber dari internet.
Temperature
The document discusses temperature and how it relates to the kinetic energy and motion of molecules. It defines temperature and explains that it is a measure of the average kinetic energy of molecules. It discusses different temperature scales including Celsius, Fahrenheit, and Kelvin and provides equations to convert between them. It also explains how temperature changes can cause materials to expand and contract as the molecules move faster or slower, taking up more or less space. Specific equations are provided to calculate the linear expansion and volume expansion of materials based on their coefficient of expansion, original length or volume, and temperature change. Examples are included to demonstrate using these equations.
Como evitar la corrrosion
La corrosión se define como el deterioro de un material debido a un ataque electroquímico por su entorno. Los metales tienden a buscar una forma más estable cuando están expuestos al aire, agua o lluvia. El herrumbre es el color naranja rojizo que se forma en el hierro cuando se corroe. La corrosión puede ocurrir de forma uniforme, galvánica o por picaduras y agrietamiento.
Stress corrosion cracking
The document discusses stress corrosion cracking (SCC), which is the failure of metal due to the combined effect of stress and chemical attack. SCC requires a susceptible metal, a specific corrosive environment, and an applied tensile stress. An example is given of the 1974 Flixborough explosion in the UK caused by SCC in mild steel exposed to hot nitrate solution under stress. SCC can initiate and propagate cracks without visible corrosion and cause sudden catastrophic failure. It commonly occurs at flaws, grain boundaries, or corrosion pits. The mechanisms of SCC include both anodic dissolution due to pre-existing flaws or grain boundary precipitates, as well as rupture of protective films by plastic strain. Prevention methods include choosing non-sus
Stress corrosion cracking
Stress corrosion cracking is the failure of a normally ductile metal caused by the combined effect of tensile stress and a corrosive environment. Three factors are required for stress corrosion cracking to occur: a susceptible material, a tensile stress (either applied or residual), and a corrosive environment. Stress corrosion cracking leads to the formation of cracks that propagate in the material over time and eventually result in sudden brittle fracture.
corrosion en la industria petroquimica
El documento habla sobre la corrosión en la industria petroquímica. Explica que esta industria es muy vulnerable a la corrosión debido a la doble afectación externa e interna en las grandes infraestructuras de acero. También describe algunos métodos para prevenir la corrosión como recubrimientos, protección catódica y el uso de aleaciones de aluminio. Finalmente, identifica algunas de las áreas más afectadas por la corrosión en la industria petroquímica.
Corrosion
El documento trata sobre la corrosión, específicamente la corrosión de armaduras en estructuras de hormigón armado expuestas al mar, la corrosión por cavitación y métodos para prevenirla. También discute inspección y medición de la corrosión, y métodos de protección contra la corrosión como diseño, recubrimientos, selección de materiales, dominio del ambiente e inhibidores de corrosión.
Recommended
Science portfolio Presentation - Conductors
The document summarizes an experimental design lab report that tested how the conductivity of different materials affected the temperature of water. The experiment tested copper, aluminum, plastic and glass and measured the temperature change of water in each material over 20 minutes. The results showed that copper produced the highest temperature change and fastest heat transfer, while plastic produced almost no change, supporting the hypothesis. The conclusion was that materials with smaller specific heat capacity can transfer thermal energy faster.
Perpindahan Panas Pada Dinding Lapis Bola - Operasi Perpindahan Kalor
Presentasi mengenai materi perpindahan panas pada dinding lapis berbentuk bola. Pada presentasi ini memuat contoh-contoh kasus dari textbook dan sumber dari internet.
Temperature
The document discusses temperature and how it relates to the kinetic energy and motion of molecules. It defines temperature and explains that it is a measure of the average kinetic energy of molecules. It discusses different temperature scales including Celsius, Fahrenheit, and Kelvin and provides equations to convert between them. It also explains how temperature changes can cause materials to expand and contract as the molecules move faster or slower, taking up more or less space. Specific equations are provided to calculate the linear expansion and volume expansion of materials based on their coefficient of expansion, original length or volume, and temperature change. Examples are included to demonstrate using these equations.
Como evitar la corrrosion
La corrosión se define como el deterioro de un material debido a un ataque electroquímico por su entorno. Los metales tienden a buscar una forma más estable cuando están expuestos al aire, agua o lluvia. El herrumbre es el color naranja rojizo que se forma en el hierro cuando se corroe. La corrosión puede ocurrir de forma uniforme, galvánica o por picaduras y agrietamiento.
Stress corrosion cracking
The document discusses stress corrosion cracking (SCC), which is the failure of metal due to the combined effect of stress and chemical attack. SCC requires a susceptible metal, a specific corrosive environment, and an applied tensile stress. An example is given of the 1974 Flixborough explosion in the UK caused by SCC in mild steel exposed to hot nitrate solution under stress. SCC can initiate and propagate cracks without visible corrosion and cause sudden catastrophic failure. It commonly occurs at flaws, grain boundaries, or corrosion pits. The mechanisms of SCC include both anodic dissolution due to pre-existing flaws or grain boundary precipitates, as well as rupture of protective films by plastic strain. Prevention methods include choosing non-sus
Stress corrosion cracking
Stress corrosion cracking is the failure of a normally ductile metal caused by the combined effect of tensile stress and a corrosive environment. Three factors are required for stress corrosion cracking to occur: a susceptible material, a tensile stress (either applied or residual), and a corrosive environment. Stress corrosion cracking leads to the formation of cracks that propagate in the material over time and eventually result in sudden brittle fracture.
corrosion en la industria petroquimica
El documento habla sobre la corrosión en la industria petroquímica. Explica que esta industria es muy vulnerable a la corrosión debido a la doble afectación externa e interna en las grandes infraestructuras de acero. También describe algunos métodos para prevenir la corrosión como recubrimientos, protección catódica y el uso de aleaciones de aluminio. Finalmente, identifica algunas de las áreas más afectadas por la corrosión en la industria petroquímica.
Corrosion
El documento trata sobre la corrosión, específicamente la corrosión de armaduras en estructuras de hormigón armado expuestas al mar, la corrosión por cavitación y métodos para prevenirla. También discute inspección y medición de la corrosión, y métodos de protección contra la corrosión como diseño, recubrimientos, selección de materiales, dominio del ambiente e inhibidores de corrosión.
Corrosión por picaduras
La corrosión por picaduras es un tipo de corrosión localizada que ocurre en sitios específicos de la superficie metálica donde la película protectora se rompe, causando la disolución local del metal. Puede presentarse en diversas formas como elíptica, estrecha y profunda. Se evalúa midiendo factores como el tamaño, espacio y profundidad de las picaduras. Existen varios métodos para prevenirla como recubrimientos protectores, protección catódica e inhibidores de corrosión.
Corrocion bajo tension mrgm civil
Este documento trata sobre la corrosión bajo tensión. Explica que es un fenómeno sinérgico entre la acción química de un medio corrosivo y las acciones mecánicas sobre un material, lo que puede causar fallas frágiles. También describe los factores que influyen en la corrosión bajo tensión como el material, medio y nivel de esfuerzos, así como formas de prevenirla como modificar cualquiera de estos factores o usar tratamientos superficiales. Incluye varios ejemplos de casos de corrosi
Presentación corrosión
La corrosión es el deterioro químico de un material por su entorno. La velocidad de corrosión depende de factores como la temperatura, concentración de reactivos y productos. Existen diferentes tipos de corrosión como la galvánica, por picaduras, fisuras o intergranular. El control de la corrosión implica modificar el diseño, materiales, protecciones anódicas/catódicas o recubrimientos. Estudiar la corrosión permite predecir el comportamiento a largo plazo de los metales.
Tipos de corrosión
Descripción general de los tipos de corrosión. Fundamentos, mecanismos de reacción, forma de identificar.
TIPOS DE CORROSIÓN
La corrosión es la degradación de un material por reacción química o electroquímica con su entorno. Puede ser de tipo químico, galvánico, por picaduras, en grietas o por erosión. Las formas comunes incluyen la corrosión uniforme, intergranular, selectiva y biológica. La corrosión reduce la vida útil de materiales como metales y puede ocasionar daños considerables si no se controla y previene adecuadamente.
Corrosion
This document discusses various forms of corrosion that can occur in metals. It begins by defining corrosion and explaining the factors that influence it. It then describes several specific types of corrosion: general/uniform corrosion, galvanic corrosion, crevice corrosion, pitting corrosion, intergranular corrosion, dealloying, erosion corrosion, stress corrosion, hydrogen damage including hydrogen blistering and hydrogen embrittlement. For each type of corrosion, the document discusses the mechanism and provides methods for prevention.
3 mecanismos corrosion
describe melicanismos de corrosión (publicacón que encontré en la WEB) que me parece interesante compartirlos
Corrosion
El documento describe los diferentes tipos y factores de la corrosión, el proceso por el cual los metales se oxidan y degradan al interactuar con su ambiente. Define la corrosión como una reacción de oxidación electroquímica entre un metal y su medio, y describe los tipos de corrosión según su proceso, morfología y formas de prevenirla, como el uso de inhibidores y aleaciones resistentes.
Corrosión en metales parte 2
El documento describe las 8 formas principales de corrosión: uniforme, galvánica, por rendija, por picaduras, intergranular, ataque selectivo, erosión y asistida por tensiones. Explica brevemente cada una de estas formas de corrosión, incluyendo sus causas, mecanismos y posibles soluciones.
A fracture mechanics based method for prediction of
The document presents a fracture mechanics-based method for predicting cracking in circular and elliptical concrete rings undergoing restrained shrinkage. It describes an experimental program using different ring geometries and material tests to determine properties. A numerical model is developed using ANSYS to model the restrained shrinkage process and calculate stress intensity factors. The model uses a fictitious temperature field to simulate shrinkage and determines cracking age by comparing driving and resistance curves. It finds cracking occurs earlier in elliptical rings and the method accurately predicts experimental cracking ages.
Pullout test as a nondestructive test method in structural engineering
- The pullout test measures the force required to pull an embedded metal insert from hardened concrete. It has been shown to have good correlation with compressive strength.
- The failure mechanism involves initial cracking around the insert followed by the development of microcracks between the insert and bearing ring. Beyond ultimate load, a circumferential crack forms extracting the failure cone.
- Within-test variability, or repeatability, of pullout tests on the same concrete is typically a coefficient of variation of 4-15%, with an average of 8%. The size of coarse aggregate affects variability.
Desouza2003
The document summarizes research on the erosion-corrosion behavior of WC-Co-Cr cermet coatings applied by thermal spraying. Experiments were conducted exposing the coatings to a liquid-solid jet of 3.5% NaCl solution with silica sand loadings of 200 and 500 mg/l. Electrochemical measurements and surface analysis using SEM were used to understand the corrosion and erosion damage mechanisms. Cathodic protection was applied to isolate the erosion effects. The results showed the WC-Co-Cr coating had higher resistance to erosion-corrosion compared to stainless steel controls. Microstructural characterization revealed the coating had a lamellar structure and composition of WC-12% Co-6% Cr with
Pullout test as nondestructive test method in structural engineering
1. The pullout test measures the force required to pull an embedded metal insert from hardened concrete. It was first described in 1938 and research in the 1960s aimed to optimize the geometry and develop simple field equipment with high correlation to compressive strength.
2. An embedment depth of 50mm was chosen as it tests beyond the surface while not requiring too much force. Tests established the optimal insert head and bearing ring diameters. Failure involves cracking around the insert and aggregate interlock up to the ultimate load.
3. For field use, a 25mm diameter steel disc on a conical stem is embedded and pulled against a reaction ring using a hydraulic jack, measuring the force. The test estimates concrete strength to determine
Fracture mechanics-based method for prediction of cracking
A fracture mechanics-based method for prediction of cracking
of circular and elliptical concrete rings under restrained
shrinkage
D0413019023
International Journal of Computational Engineering Research(IJCER) is an intentional online Journal in English monthly publishing journal. This Journal publish original research work that contributes significantly to further the scientific knowledge in engineering and Technology
Selection of a_completion_material_for_a
This document describes testing done to select a completion material for an oil field with varying sour conditions. A testing program evaluated corrosion resistance, mechanical properties, and fracture mechanics concepts. Dynamic crack branching (DCB) testing was used to determine stress corrosion cracking resistance by calculating threshold stress intensity (Kissce) values. Testing showed that a 13Cr alloy (Steel C) had the best combination of resistance to general corrosion, localized corrosion, and stress corrosion cracking within the field conditions, making it the most suitable completion material selection.
C04702028039
International Journal of Computational Engineering Research (IJCER) is dedicated to protecting personal information and will make every reasonable effort to handle collected information appropriately. All information collected, as well as related requests, will be handled as carefully and efficiently as possible in accordance with IJCER standards for integrity and objectivity.
1-1 Influence of Multi Extrusion Die Process on Mechanical and Chemical Behav...
1-1 Influence of Multi Extrusion Die Process on Mechanical and Chemical Behav...Ahmed Ibrahim Razooqi
INFLUENCE OF MULTI EXTRUSION DIE PROCESS ON MECHANICAL
AND CHEMICAL BEHAVIOR OF 2024-T3 ALLOY.
Ahmed Ibrahim RAZOOQI
Technical Engineering College - Baghdad, Middle Technical University, Baghdad, IRAQThe Effects of Copper Addition on the compression behavior of Al-Ca Alloy
The Al-Ca-Cu alloys containing varying amount of Cu are used to study the effect of Cu addition on
their deformation behavior at varying strain rate (0.001/s, 0.01/s, 0.1/s, 1/s).The material is prepared using stir
casting technique The yield stress, flow stress and elastic limit are measured from the true stress-strain graph
.The Strain Rate sensitivity and strain hardening exponent are also determined for each material at different
strain rate. The Strain Rate Sensitivity of this alloy is very low. These values strongly demonstrate that
compressive deformation of Al-Ca-Cu alloys almost independent to the strain rate at room temperature
deformation.
Correlation between the Interface Width and the Adhesion Strength of Copper F...
1) The document examines how applying a negative bias voltage to carbon steel substrates during copper film deposition via magnetron sputtering affects the adhesion strength and interface width between the film and substrate.
2) Adhesion strength, measured via scratch testing, increased with higher bias voltage. The critical load reached 18.5g at -600V bias compared to 9.5g for an unbiased substrate.
3) Interface width, measured by Auger electron spectroscopy, also increased with higher bias voltage. The width was 335nm at -600V bias versus 180nm for an unbiased substrate.
4) The results suggest that bias voltage promotes diffusion and mixing at the interface, widening it. This, along
Laser Peening LSP
1. Laser pulses were used to generate shock waves in solids with peak pressures ranging from 5 to 120 kilobars. Peak pressures of around 35 kilobars were achieved at a fluence of 1000 J/cm2, while applying a transparent overlay increased the peak pressure to 120 kilobars.
2. Measurements found that plasma initiation occurred around 8 nanoseconds into a laser pulse when exposing a graphite coating. The resulting shock wave rose sharply at 37 nanoseconds, with only a small precursor pressure seen earlier.
3. Precursor pressures seen with carbon-resin coatings but not with pure graphite coatings, supporting the idea that precursors are due to surface ablation pressures before plasma formation
Fluid Dynamic Simulation and Experimental Study of Honeycomb Seal Structures ...
Electrochemical discharge machining (ECDM) is a composite technology that combines electric discharge machining (EDM) with electrochemical machining (ECM). In this study, ECDM was used for the processing of honeycomb seal structures, and fluid dynamic simulation and experimental study were conducted. A vortex effect was observed, hindering the electrolyte flow. Compared to other fluid supply methods, a bilateral fluid supply can reduce vorticity and velocity, weakening the vortex effect. According to the result and the current signals after discrete wavelet transformation (DWT), the higher voltage and flow rate can increase total energy and exacerbate the vortex effect respectively, and strengthen the EDM and ECM effect, resulting in more processing depth, over corrosion depth, and molten product height. However, the higher electrolyte concentration can reduce the EDM effect, and enhance the ECM effect, which leads to more over corrosion depth, less processing depth and molten product height. The research results proved that ECDM has a good effect on processing honeycomb seal structures.
More Related Content
Viewers also liked
Corrosión por picaduras
La corrosión por picaduras es un tipo de corrosión localizada que ocurre en sitios específicos de la superficie metálica donde la película protectora se rompe, causando la disolución local del metal. Puede presentarse en diversas formas como elíptica, estrecha y profunda. Se evalúa midiendo factores como el tamaño, espacio y profundidad de las picaduras. Existen varios métodos para prevenirla como recubrimientos protectores, protección catódica e inhibidores de corrosión.
Corrocion bajo tension mrgm civil
Este documento trata sobre la corrosión bajo tensión. Explica que es un fenómeno sinérgico entre la acción química de un medio corrosivo y las acciones mecánicas sobre un material, lo que puede causar fallas frágiles. También describe los factores que influyen en la corrosión bajo tensión como el material, medio y nivel de esfuerzos, así como formas de prevenirla como modificar cualquiera de estos factores o usar tratamientos superficiales. Incluye varios ejemplos de casos de corrosi
Presentación corrosión
La corrosión es el deterioro químico de un material por su entorno. La velocidad de corrosión depende de factores como la temperatura, concentración de reactivos y productos. Existen diferentes tipos de corrosión como la galvánica, por picaduras, fisuras o intergranular. El control de la corrosión implica modificar el diseño, materiales, protecciones anódicas/catódicas o recubrimientos. Estudiar la corrosión permite predecir el comportamiento a largo plazo de los metales.
Tipos de corrosión
Descripción general de los tipos de corrosión. Fundamentos, mecanismos de reacción, forma de identificar.
TIPOS DE CORROSIÓN
La corrosión es la degradación de un material por reacción química o electroquímica con su entorno. Puede ser de tipo químico, galvánico, por picaduras, en grietas o por erosión. Las formas comunes incluyen la corrosión uniforme, intergranular, selectiva y biológica. La corrosión reduce la vida útil de materiales como metales y puede ocasionar daños considerables si no se controla y previene adecuadamente.
Corrosion
This document discusses various forms of corrosion that can occur in metals. It begins by defining corrosion and explaining the factors that influence it. It then describes several specific types of corrosion: general/uniform corrosion, galvanic corrosion, crevice corrosion, pitting corrosion, intergranular corrosion, dealloying, erosion corrosion, stress corrosion, hydrogen damage including hydrogen blistering and hydrogen embrittlement. For each type of corrosion, the document discusses the mechanism and provides methods for prevention.
3 mecanismos corrosion
describe melicanismos de corrosión (publicacón que encontré en la WEB) que me parece interesante compartirlos
Corrosion
El documento describe los diferentes tipos y factores de la corrosión, el proceso por el cual los metales se oxidan y degradan al interactuar con su ambiente. Define la corrosión como una reacción de oxidación electroquímica entre un metal y su medio, y describe los tipos de corrosión según su proceso, morfología y formas de prevenirla, como el uso de inhibidores y aleaciones resistentes.
Corrosión en metales parte 2
El documento describe las 8 formas principales de corrosión: uniforme, galvánica, por rendija, por picaduras, intergranular, ataque selectivo, erosión y asistida por tensiones. Explica brevemente cada una de estas formas de corrosión, incluyendo sus causas, mecanismos y posibles soluciones.
Viewers also liked (9)
Similar to SCC Research Guide
A fracture mechanics based method for prediction of
The document presents a fracture mechanics-based method for predicting cracking in circular and elliptical concrete rings undergoing restrained shrinkage. It describes an experimental program using different ring geometries and material tests to determine properties. A numerical model is developed using ANSYS to model the restrained shrinkage process and calculate stress intensity factors. The model uses a fictitious temperature field to simulate shrinkage and determines cracking age by comparing driving and resistance curves. It finds cracking occurs earlier in elliptical rings and the method accurately predicts experimental cracking ages.
Pullout test as a nondestructive test method in structural engineering
- The pullout test measures the force required to pull an embedded metal insert from hardened concrete. It has been shown to have good correlation with compressive strength.
- The failure mechanism involves initial cracking around the insert followed by the development of microcracks between the insert and bearing ring. Beyond ultimate load, a circumferential crack forms extracting the failure cone.
- Within-test variability, or repeatability, of pullout tests on the same concrete is typically a coefficient of variation of 4-15%, with an average of 8%. The size of coarse aggregate affects variability.
Desouza2003
The document summarizes research on the erosion-corrosion behavior of WC-Co-Cr cermet coatings applied by thermal spraying. Experiments were conducted exposing the coatings to a liquid-solid jet of 3.5% NaCl solution with silica sand loadings of 200 and 500 mg/l. Electrochemical measurements and surface analysis using SEM were used to understand the corrosion and erosion damage mechanisms. Cathodic protection was applied to isolate the erosion effects. The results showed the WC-Co-Cr coating had higher resistance to erosion-corrosion compared to stainless steel controls. Microstructural characterization revealed the coating had a lamellar structure and composition of WC-12% Co-6% Cr with
Pullout test as nondestructive test method in structural engineering
1. The pullout test measures the force required to pull an embedded metal insert from hardened concrete. It was first described in 1938 and research in the 1960s aimed to optimize the geometry and develop simple field equipment with high correlation to compressive strength.
2. An embedment depth of 50mm was chosen as it tests beyond the surface while not requiring too much force. Tests established the optimal insert head and bearing ring diameters. Failure involves cracking around the insert and aggregate interlock up to the ultimate load.
3. For field use, a 25mm diameter steel disc on a conical stem is embedded and pulled against a reaction ring using a hydraulic jack, measuring the force. The test estimates concrete strength to determine
Fracture mechanics-based method for prediction of cracking
A fracture mechanics-based method for prediction of cracking
of circular and elliptical concrete rings under restrained
shrinkage
D0413019023
International Journal of Computational Engineering Research(IJCER) is an intentional online Journal in English monthly publishing journal. This Journal publish original research work that contributes significantly to further the scientific knowledge in engineering and Technology
Selection of a_completion_material_for_a
This document describes testing done to select a completion material for an oil field with varying sour conditions. A testing program evaluated corrosion resistance, mechanical properties, and fracture mechanics concepts. Dynamic crack branching (DCB) testing was used to determine stress corrosion cracking resistance by calculating threshold stress intensity (Kissce) values. Testing showed that a 13Cr alloy (Steel C) had the best combination of resistance to general corrosion, localized corrosion, and stress corrosion cracking within the field conditions, making it the most suitable completion material selection.
C04702028039
International Journal of Computational Engineering Research (IJCER) is dedicated to protecting personal information and will make every reasonable effort to handle collected information appropriately. All information collected, as well as related requests, will be handled as carefully and efficiently as possible in accordance with IJCER standards for integrity and objectivity.
1-1 Influence of Multi Extrusion Die Process on Mechanical and Chemical Behav...
1-1 Influence of Multi Extrusion Die Process on Mechanical and Chemical Behav...Ahmed Ibrahim Razooqi
INFLUENCE OF MULTI EXTRUSION DIE PROCESS ON MECHANICAL
AND CHEMICAL BEHAVIOR OF 2024-T3 ALLOY.
Ahmed Ibrahim RAZOOQI
Technical Engineering College - Baghdad, Middle Technical University, Baghdad, IRAQThe Effects of Copper Addition on the compression behavior of Al-Ca Alloy
The Al-Ca-Cu alloys containing varying amount of Cu are used to study the effect of Cu addition on
their deformation behavior at varying strain rate (0.001/s, 0.01/s, 0.1/s, 1/s).The material is prepared using stir
casting technique The yield stress, flow stress and elastic limit are measured from the true stress-strain graph
.The Strain Rate sensitivity and strain hardening exponent are also determined for each material at different
strain rate. The Strain Rate Sensitivity of this alloy is very low. These values strongly demonstrate that
compressive deformation of Al-Ca-Cu alloys almost independent to the strain rate at room temperature
deformation.
Correlation between the Interface Width and the Adhesion Strength of Copper F...
1) The document examines how applying a negative bias voltage to carbon steel substrates during copper film deposition via magnetron sputtering affects the adhesion strength and interface width between the film and substrate.
2) Adhesion strength, measured via scratch testing, increased with higher bias voltage. The critical load reached 18.5g at -600V bias compared to 9.5g for an unbiased substrate.
3) Interface width, measured by Auger electron spectroscopy, also increased with higher bias voltage. The width was 335nm at -600V bias versus 180nm for an unbiased substrate.
4) The results suggest that bias voltage promotes diffusion and mixing at the interface, widening it. This, along
Laser Peening LSP
1. Laser pulses were used to generate shock waves in solids with peak pressures ranging from 5 to 120 kilobars. Peak pressures of around 35 kilobars were achieved at a fluence of 1000 J/cm2, while applying a transparent overlay increased the peak pressure to 120 kilobars.
2. Measurements found that plasma initiation occurred around 8 nanoseconds into a laser pulse when exposing a graphite coating. The resulting shock wave rose sharply at 37 nanoseconds, with only a small precursor pressure seen earlier.
3. Precursor pressures seen with carbon-resin coatings but not with pure graphite coatings, supporting the idea that precursors are due to surface ablation pressures before plasma formation
Fluid Dynamic Simulation and Experimental Study of Honeycomb Seal Structures ...
Electrochemical discharge machining (ECDM) is a composite technology that combines electric discharge machining (EDM) with electrochemical machining (ECM). In this study, ECDM was used for the processing of honeycomb seal structures, and fluid dynamic simulation and experimental study were conducted. A vortex effect was observed, hindering the electrolyte flow. Compared to other fluid supply methods, a bilateral fluid supply can reduce vorticity and velocity, weakening the vortex effect. According to the result and the current signals after discrete wavelet transformation (DWT), the higher voltage and flow rate can increase total energy and exacerbate the vortex effect respectively, and strengthen the EDM and ECM effect, resulting in more processing depth, over corrosion depth, and molten product height. However, the higher electrolyte concentration can reduce the EDM effect, and enhance the ECM effect, which leads to more over corrosion depth, less processing depth and molten product height. The research results proved that ECDM has a good effect on processing honeycomb seal structures.
Evaluating Concrete Quality using Nondestructive In-situ Testing Methods
Evaluating Concrete Quality using Nondestructive In-situ Testing MethodsKhalid Abdel Naser Abdel Rahim
This document discusses non-destructive in-situ testing methods to evaluate concrete quality, including rebound hammer testing, ultrasonic pulse velocity testing, initial surface absorption testing, and the Figg air test. It describes the procedures for each test and discusses their advantages and limitations. The document presents results of these tests on concrete specimens with varying water-cement ratios and analyzes how the strength and quality of concrete are affected by the water-cement ratio.IMPACT TEST REPORT ...
In the material testing laboratory, a Charpy impact test was performed on three different types (hot,cold,and steel alloy)of steels testing each variety at four different temperatures (32°C(RT), 100°C,0°C and -22°C ). From results (shown below), we determined that the a transition is from ductile failures to brittle failures
Study and Experimental Modelling of Welding Parameters on Hardness of Hot Air...
The present work has been carried out to study the effect of some input parameters on the desired responses in the Poly Vinyl Chloride (PVC) plastic welding by hot air technique. The effect of hot air temperature, welding speed and air flow rate has been evaluated on the Hardness of the welded joints. These responses have been analysed using the analysis of variance (ANOVA) and experimental modeling. Plots of significant factors and experimental modeling have been used to determine the best fit relationship between the responses and the model parameters using MINITAB 17. This has been used to determine the most influencing parameter.
mechanical failure.pptx
This document summarizes key concepts related to mechanical failure of materials. It discusses how cracks form and propagate, leading to brittle or ductile failure. Factors like stress concentration, loading rate, temperature and microstructure affect failure behavior. The main failure modes covered are fracture, fatigue and creep. Fracture toughness and impact testing help quantify a material's resistance to failure when cracks are present. The ductile to brittle transition temperature is also explained.
mechanical failure.pptx
This document discusses various failure modes in materials including cracks, fracture, fatigue, and the ductile to brittle transition. It addresses how cracks form and propagate, how fracture resistance is quantified, and factors that influence failure such as loading rate, temperature, and stress concentration. Ductile fracture involves plastic deformation while brittle fracture does not. Fatigue failure can occur at stresses lower than the material strength from cyclic loading. The ductile to brittle transition temperature depends on the material. Fracture toughness measures resistance to crack propagation.
Approach to simultaneous improvement of strength, ductility
In this presentation , i have mentioned various methods to improve strength ,ductility and toughness of low carbon steel
Ijsea04031008
Corrosion fatigue crack growth experiment was conducted on ESE(T) (Eccentrically-loaded Single Edge notch Tension) specimen made of IS 2062 steel in salt water environment. The specimen was placed in a transparent chamber made of perspex sheet containing 3.5% NaCl solution which acted as corrosion environment. The corrosion process was accelerated by applying constant direct current of 0.2 A which was supplied by means of a regulated power supply. The test was conducted using a ±250 kN capacity computer controlled servo-hydraulic fatigue rated Universal Testing Machine. The maximum and minimum load values were 15 kN and 1.5 kN. The test frequency was 0.375 Hz and the stress ratio was 0.1. Number of cycles to crack initiation was determined. Crack growth data were recorded at regular intervals. Crack growth curves were plotted and material constants C and m were found. Analytical studies were carried out and the results were compared with experimental results. Details of the analytical and experimental studies and the results are presented in this paper.
Similar to SCC Research Guide (20)
A fracture mechanics based method for prediction of
A fracture mechanics based method for prediction of
Pullout test as a nondestructive test method in structural engineering
Pullout test as a nondestructive test method in structural engineering
Pullout test as nondestructive test method in structural engineering
Pullout test as nondestructive test method in structural engineering
Fracture mechanics-based method for prediction of cracking
Fracture mechanics-based method for prediction of cracking
1-1 Influence of Multi Extrusion Die Process on Mechanical and Chemical Behav...
1-1 Influence of Multi Extrusion Die Process on Mechanical and Chemical Behav...
The Effects of Copper Addition on the compression behavior of Al-Ca Alloy
The Effects of Copper Addition on the compression behavior of Al-Ca Alloy
Correlation between the Interface Width and the Adhesion Strength of Copper F...
Correlation between the Interface Width and the Adhesion Strength of Copper F...
Fluid Dynamic Simulation and Experimental Study of Honeycomb Seal Structures ...
Fluid Dynamic Simulation and Experimental Study of Honeycomb Seal Structures ...
Evaluating Concrete Quality using Nondestructive In-situ Testing Methods
Evaluating Concrete Quality using Nondestructive In-situ Testing Methods
Study and Experimental Modelling of Welding Parameters on Hardness of Hot Air...
Study and Experimental Modelling of Welding Parameters on Hardness of Hot Air...
Approach to simultaneous improvement of strength, ductility
Approach to simultaneous improvement of strength, ductility
SCC Research Guide
- 1. Stress Corrosion Cracking Research Guide This page depicts the environmental chamber created to surround the actuator arm
- 2. The load chain and CT specimens were designed to meet ASTM E647 Crack growth was measured using the direct current potential drop (DCPD) method to circumvent temperature and corrosion affecting the strain gauges U-bend samples were also tested to examine the effects of residual stress rather than applied stress U-bend surface SCC over 17 days U-bend test sample Compact Tension sample
- 3. Stress Corrosion Cracking Research Results This graph shows varying SCC rates dependent on environmental and material factors. Increased temperature had a large effect on SCC acceleration This graph shows SCC pitting rates dependent on environmental and material factors. There was an upper threshold to pitting initiation due to ion consumption from neighboring pits