What is the difference between "Maximum Principal Stress", "Maximum Principal Back Stress", "Maximum Principal Value of Stress", and "Major Principal Value of Stress"?
Major principal stress is the principal stress with maximum absolute value. For example, at an integration point, Sigma_1=-100, Sigma_2=-200 and Sigma_3=-300, major principal stress is -300. Maximum principal stress is the highest value, in this example -100.
The back stress tensor is relevant to viscoplasticity. Where the yield surface can shift if you use kinematic hardening.
Major principal stress is the principal stress with maximum absolute value. For example, at an integration point, Sigma_1=-100, Sigma_2=-200 and Sigma_3=-300, major principal stress is -300. Maximum principal stress is the highest value, in this example -100.
The back stress tensor is relevant to viscoplasticity. Where the yield surface can shift if you use kinematic hardening.
