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ABAQUS SPRINC Function Question


I am writing a UMAT in ABAQUS and I would like to obtain the eigenvalues of a matrix (it is the left Cauchy-Green matrix used for hyperelastic formulations, to be specific.) I know that this is a strain matrix, and the documentation for ABAQUS 6.12 says to call the SPRINC function, which runs fine, but what I am confused about is: why one would need to specify whether the input matrix to that function is a stress or a strain matrix? I tried specifying it as a either type of matrix, and it outputs different results for those two cases. What I want to know is, what is different about the way that ABAQUS calculates the eigenvalues in those two cases. I would appreciate it if someone out there knows and could tell me. Thanks!



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