Define strain energy.

1.	Define strain energy.
A.	It refers to external work done on a bar.
B.	It refers to change in length of a bar.
C.	It is the potential energy stored by an elastic body when deformed.
D.	It is the energy released by a bar during loading process.
Answer» D. It is the energy released by a bar during loading process.

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Define strain energy.

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