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Under Stress

Elastic or Plastic
No material is absolutely rigid. Even a concrete floor changes shape as you walk across it. The behaviour
of a material subjected to a tensile (pulling) or compressive (pushing) force can be described as either
elastic or plastic.
a material is elastic if it returns…

Page 2

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Some elastic materials are intended to absorb energy. The more a material is extended, the greater the
force required.
The energy stored as a material is deformed is represented by the area between the curve and the
extension axis.
If a force F produces an extension e below the limit…

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