Engineering Materials
Thermoplastic materials are those materials which

Are formed into shape under heat and pressure and results in a permanently hard product
Are used as a friction lining for clutches and brakes
Are flexible and can withstand considerable wear under suitable conditions
Do not become hard with the application of heat and pressure and no chemical change occurs

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Engineering Materials
Stress relaxation is the phenomenon

In which deformation tends to loosen the joint and produces a stress reduced
In which stress remains constant on increasing load
Stress reduces on increasing load
In which parts are not loaded

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