I am modeling a nonlinear material using bilinear.
It is a plastic material where stress is dropping after yield point and modulus given in the specification is secant modulus NOT tangent modulus (initial best straight line).
I wanted to know for the ANSYS bilinear input below:
Modulus: Should I use tangent modulus or secant modulus (usually use this for linear properties)
Yield Strength: Should I use the stress point at the end of best straight line or yield point (usually use it for linear properties)
Tangent modulus: Should the tangent modulus be calculated based on engineering stress/strain or true stress/strain?