Greetings,
Im writting the the umat coding, and would like call the principal stress by using CALL SPRIND(S.......), im applied my loading with uniaxial compresssion in the x-axis (can be consider in direction 1), and im try to print out the result of S11 and results shows that the bigger value (as experimental results) BUT in the print out principal stress it shows that the compression stress become in the PS(2)?
May i know how i can define the exact ps(1), PS(2) and PS(3) exactly as i want to define my yield criterion by using principal stress (1), (2) and (3).
Your help highly appreciate it. Thank you.
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