GATE Exam Questions - Engineering

Q1:

A mild steel specimen is under uni-axial tensile stress. Young's modulus and yield stress for mild steel are 2 x 105 MPa and 250 MPa respectively. The maximum amount of strain energy per unit volume that can be stored in this speciment without permanent set, is

A 156 Nmm/mm3

B 15.6 Nmm/mm3

C 1.56 Nmm/mm3

D 0.156 Nmm/mm3

ANS:D - 0.156 Nmm/mm3

P^2/ 2E = (250^2)/(2*2*10^5) = 0.156.