Stress/Strain vs Plastic Hardening Curve
Stress/Strain vs Plastic Hardening Curve
(OP)
Hi People,
Could you, please, explain me what is the "difference" between these two curves?
When I use one and when I use the other in FEA/FEM studies?
Thanks in Advance.
WPZ
Could you, please, explain me what is the "difference" between these two curves?
When I use one and when I use the other in FEA/FEM studies?
Thanks in Advance.
WPZ





RE: Stress/Strain vs Plastic Hardening Curve
For S355 steel for example, the elastic yield stress is 355N/mm2 depending on plate thickness. Beyond this point it has reached its elastic limit, and in a linear analysis would be inadequate. If we take into account strain hardening, we can use a slightly higher yield stress. Details of a suitable non-linear stress/strain curve are given in BS EN 1993-1-5, which if I recall allows an ultimate strain of 5% with a gradient of E/10 after elastic yield has occured.
The improved yield stress would thus be = sigma_el + (e_max - e_elastic)*E/10. e_elastic = E/sigma_el