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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