The document discusses material selection criteria for plastics in specific applications. It outlines the process of selecting plastics which involves defining the product purpose, assessing material properties, and considering factors like strength, temperature resistance, wear resistance, degradation resistance, and special properties. The document provides data on various plastic materials and their properties to guide selection. Key properties discussed include tensile strength, fatigue resistance, toughness, corrosion resistance, coefficient of friction, and electrical and thermal properties. Examples are given of applications suited for different plastics based on required characteristics.
This topic provides an understanding on the purposes of materials testing and deformities in certain materials. It also explains on the definition and principle on mechanical properties of materials, destructive and non-destructive tests.
This topic provides an understanding on the purposes of materials testing and deformities in certain materials. It also explains on the definition and principle on mechanical properties of materials, destructive and non-destructive tests.
Strength of Materials Lecture - 2
Elastic stress and strain of materials (stress-strain diagram)
Mehran University of Engineering and Technology.
Department of Mechanical Engineering.
Metal matrix composites (MMCs) possess significantly improved properties including highspecific strength; specific modulus, damping capacity and good wear resistance compared to unreinforced alloys. There has been an increasing interest in composites containing low density and low cost reinforcements. Among various discontinuous dispersoids used, fly ash is one of the most inexpensive and low density reinforcement available in large quantities as solid waste by-product during combustion of coal in thermal power plants. Hence, composites with fly ash as reinforcement are likely to overcome the cost barrier for wide spread applications in automotive and small engine applications.
FellowBuddy.com is an innovative platform that brings students together to share notes, exam papers, study guides, project reports and presentation for upcoming exams.
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Stress concentrations produced by discontinuities in structures such as holes, notches, and fillets will be introduced in this section. The stress concentration factor will be defined. The concept of fracture toughness will also be introduced.
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Concurrent engineering is a contemporary approach to DFSS. DFX techniques are part of detail design and are ideal approaches to improve life-cycle cost, quality, increased design flexibility, and increased efficiency and productivity using the concurrent design concepts (Maskell 1991). Benefits are usually pinned as competitiveness measures, improved decision-making, and enhanced operational efficiency. The letter “X” in DFX is made up of two parts: life-cycle processes x and performance measure
Strength of Materials Lecture - 2
Elastic stress and strain of materials (stress-strain diagram)
Mehran University of Engineering and Technology.
Department of Mechanical Engineering.
Metal matrix composites (MMCs) possess significantly improved properties including highspecific strength; specific modulus, damping capacity and good wear resistance compared to unreinforced alloys. There has been an increasing interest in composites containing low density and low cost reinforcements. Among various discontinuous dispersoids used, fly ash is one of the most inexpensive and low density reinforcement available in large quantities as solid waste by-product during combustion of coal in thermal power plants. Hence, composites with fly ash as reinforcement are likely to overcome the cost barrier for wide spread applications in automotive and small engine applications.
FellowBuddy.com is an innovative platform that brings students together to share notes, exam papers, study guides, project reports and presentation for upcoming exams.
We connect Students who have an understanding of course material with Students who need help.
Benefits:-
# Students can catch up on notes they missed because of an absence.
# Underachievers can find peer developed notes that break down lecture and study material in a way that they can understand
# Students can earn better grades, save time and study effectively
Our Vision & Mission – Simplifying Students Life
Our Belief – “The great breakthrough in your life comes when you realize it, that you can learn anything you need to learn; to accomplish any goal that you have set for yourself. This means there are no limits on what you can be, have or do.”
Like Us - https://www.facebook.com/FellowBuddycom
Stress concentrations produced by discontinuities in structures such as holes, notches, and fillets will be introduced in this section. The stress concentration factor will be defined. The concept of fracture toughness will also be introduced.
Design for x : Design for Manufacturing,Design for Assembly Naseel Ibnu Azeez
Concurrent engineering is a contemporary approach to DFSS. DFX techniques are part of detail design and are ideal approaches to improve life-cycle cost, quality, increased design flexibility, and increased efficiency and productivity using the concurrent design concepts (Maskell 1991). Benefits are usually pinned as competitiveness measures, improved decision-making, and enhanced operational efficiency. The letter “X” in DFX is made up of two parts: life-cycle processes x and performance measure
There are over 100,000 engineering materials to choose from. The typical design engineer should have ready access to information on 30 to 60 materials, depending on the range of applications he or she deals with.
Nano Technology & Nano Materials
by Ray Fernando, PHD
California Polytechnic State University
Polymers and Coatings Program
Department of Chemistry and Biochemistry
San Luis Obispo, CA
www.polymerscoatings.calpoly.edu
Delivered 22 June 2009 @ SLINTEC
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5.material selection criteria
1. CENTRAL INSTITUTE OF PLASTICS ENGINEERING & TECHNOLGOY
GUINDY, CHENNAI - 600 032
MATERIAL SELECTION
CRITERIA FOR
SPECIFIC END USE
Dr.T.O. VARGHEESE
CIPET, CHENNAI
2. How do we decide which Plastics, if any,
is best for a particular application?
Material Selection is not as difficult as it might
appear but it does require an awareness of the
general behaviour of plastics as a group , as
well as a familiarity with the special
characteristics of individual plastics.
3. Need Recognition
Functional Specification
Concept Generation and Evaluation
Part Design Process Design
•Layout/drawing •Manufacturing Method Selection
•Constrains •System layout
•Analysis •Integration of system
•Material Choice •Manufacturing procedure
Prototype creation & Verification
Production Implementation
4. First Step – Important
To define clearly the purpose & function of
the proposed product and to identify service
requirements.
Second Step
Assess the suitability of a range of candidate
materials.
5. Most Important characteristics requiring
consideration for most Engineering components.
• Mechanical Properties –
Strength, Stiffness, Fatigue, Toughness and
the influence of high or low temperature.
6. 1.Corrosion susceptibility and degradation
2. Wear resistance & Frictional property
3. Special Property requirement for example:
Thermal, Electrical, Optical, Magnetic &
Damping capacity.
• Moulding and or other method of Fabrication.
• Total cost (material & Manufacturing).
9. Fatigue:
Plastics are susceptible to brittle crack growth
fractures as a result of cyclic stresses. Plastics are
also prone to thermal softening if the cyclic stress
or rate is high. The best plastics are Polypropylene
(PP), Ethylene-Propylene copolymer and PVDF.
(Self Hinge application).
10. Toughness:
By toughness we mean the resistance to fracture.
At room temperature the unreinforced plastics
include Nylon 66, LDPE, LLDPE, EVA and
Polyurethane structural foam. At sub-zero
temperatures it is necessary to consider plastics
such as ABS, Polycarbonate and EVA.
11. Degradation:
Physical or Chemical attack:
Plastics are best corrosion resistance material.
Plastics are susceptible to chemical attack and
degradation. Degradation of plastics is also
caused by heat, stress and radiation. Generally
Crystalline plastics offer better environmental
resistance than Amorphous. Nylon 66, PEEK &
PPS. Noknown solvent at room temperature for
PP, PE, PPS & PEEK.
12. Weathering:
This generally occurs as a result of the combined
effect of water absorption and exposure to Ultra-
Violate radiation.
Oxidation:
This is caused by contact with oxidising acids,
exposure to UV.
13. Wear Resistance and Frictional Properties:
The use of plastics in bearing application and in
situation where there is sliding contact e. g. gears,
piston rings, seals cams etc. The advantage of
plastics are low rates of wear in the absence of
conventional lubricants, low cof. The ability to
absorb shock and vibration with the ability to
operate with low noise and power consumption.
The plastics with the best resistance to wear are
Ultra High Molecular Weight Polyethylene (used in
Hip joint replacement) and PTFE lubricated
Polyamide (Nylon), Acetal & PBT
14. The plastics with the best resistance to wear are Ultra
High Molecular Weight Polyethylene (used in Hip joint
replacement) and PTFE lubricated Polyamide (Nylon),
Acetal & PBT. It is NOT recommended to use the same
plastics for both mating surfaces in applications such as
gear wheels.
16. Special Properties:
Thermal Properties:
Properties of Plastics are Temperature dependent.
Glass Transition Temp. below which the material
behaves like Glass. For example Polystyrene and
Acrylic are below their Tg at room temp. The
material is in Glassy state. Same PE is above its
Tg and hence very Flexible.
17. Special Properties:
Electrical Properties:
PTFE & PE are among the best insulating
materials available.Insulators should have
Resistivity>104Ω.
Local breakdown may occur due to tracking and
PTFE, Acetal, Acrylic & PP/PE copolymers offer
very good resistance.
Plastics can be made conductive for special
applications. (Microwave Oven).