ISRO Scientist or Engineer Civil 2014 Question 27

Question 27

A rod of length L= 500 mm and cross sectional area A = 60 $$mm^{2}$$ is made of an elasto plastic material having a modular of elasticity E = 200 Gpa nits elastic range and yield point $$\sigma y$$=300 Mpa. The rod is subjected to an axial load until it is stretched 7 mm and the load is then removed. What is the resulting permanent set?

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