1.
Introduction
When a force is applied on a body it suffers a
change in shape, that is, it deforms. A force
to resist the deformation is also set up simultaneously
within the body and it increases as the deformation
continues.
The process of
deformation stops when the internal resisting
force equals the externally applied force. If
the body is unable to put up full resistance to
external action, the process of deformation continues
until failure takes place. The deformation of
a body under external action and accompanying
resistance to deform are referred to by the terms
strain and stress respectively.
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