I want to calculate the torsional stiffness of a cross member and compare two different materials. So i put Steel as material and enter the values:
Material 1
Tensile Yield Stress: 460 MPa
Tensile Ultimate Stress: 670 MPa
Material 2
Tensile Yield Stress: 550 MPa
Tensile Ultimate Stress: 760 MPa
After this, I do two simulations, one for each material. When I later open the Measures dialog box it shows that the "max_rot_x" is the same on both crossmembers (the rotation is in x-direction). This doesn't make any sense to me. The cross member with the better material quality should have a higher torsional stiffness than the exact same cross member with less quality, right?
Is there any other way to calculate the torsional stiffness?
See the pictures below