An elastoplastic bar is clamped at the left end, and variable loads are applied at the right end, as shown in the table. Plot the stress-strain curve by changing the applied forces by 5 kN increments.
Assume the following material properties with isotropic hardening: E = 70 GPa, H = 10 GPa, σY = 250 MPa. The length of the bar is L = 1 m, and the cross-sectional area is A = 1.0 X 10-4 m2.
| Load Step |
1 |
2 |
3 |
4 |
| Force (kN) |
30 |
20 |
35 |
20 |