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[nishantsinghbme]

While assigning bi-linear isotropic hardening to the material. Is it necessary to assign compressive yield and compressive ultimate strength? I have attached two images for the same, hope it will clarify my question to you all. Is there any effect on solution?

[Saumadeep Choudhury]

Hi @nishantsinghbme
While assigning bi-linear isotropic hardening to the material, the two necessary inputs are - Yield StrengthandTangent Modulus. A bilinear stress-strain curve is generated and the slope of the first segment in the curve is equivalent to Young's modulus of the material while the slope of the second segment is the tangent modulus.
Please refer to - 6.7.1. Bilinear Isotropic Hardening (ansys.com) and 37.4. Material Properties (ansys.com)

Regards, Saumadeep
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[nishantsinghbme]

thanks for your reply. I am trying to evaluate safety factor from the supplied material as given in image above (with bi linear isotropic hardening and without compressive yield strength) and error occurred showing error occurs showing "yield strength is required but not defined" (image attached). In this regard, i tried to give yield strength separately (with same value as given in bi linear isotropic hardening) along with bi-linear isotropic hardening but same error occurred. In third try, I have made a new material model with all parameters given in the above image but again error occurred.
Please suggest me what is the actual problem.
Thanks In advance
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