The length of a material initially is L i . The material is then put under tensi

Question

The length of a material initially is Li. The material is then put under tension until it reaches < y. The tension is then completely removed and the material is measured to be Lf. How do Li and Lf compare?

a) They are the same because the entire process remains in the elastic region

b) They are the same because the entire process remains in the plastic region

c) They are the same because materials do not deform under tension.

d) The final length will be longer

e) The final length will be shorter

Explanation / Answer

Yield stress is the stress at which deformation is 0.02% plastic. The plastic deformation is permanent deformation. So final length is greater than initial length.

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