57. The ultimate tensile strength of a material is 400 MPa and the elongation up to
maximum load is 35%. If the material obeys power law of hardening, then the
true stress-true strain relation (stress in MPa) in the plastic deformation range is:
(A) σ = 540 ε
0.30(B) σ = 775 ε
0.30(C) σ = 540 ε
0.35(D) σ = 775 ε
0.35
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