Question

The table below lists stress range and strain range values for several stabilized hysteresis loops for a stainless steel. From these data determine the cyclic strength coefficient k' and cyclic strain hardening exponent n'. The modulus of elasticity for the material is 200 gpa. Δε δσ (mpa) δε δσ (mpa) δε δσ (mpa) 0.0008 168 0.008 578 0.016 698 0.002 350 0.01 610 0.018 736 0.004 500 0.012 634 0.020 768 0.006 560 0.014 666 sy (0.2 % offset) = 325 mpa, su = 650 mpa, n = 0.19. Did it harden or soften?

Answer 1

no idea . by the way which class ?