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I need to use the 2nd Piola Kirchoff Stress (S) rather than the usual Cauchy stress i(sigma) in a general transport equation of a material. I was wondering if I need to replace the stress tensor (usually denoted by sigma) with S, or do I just write sigma in terms of S using the relationship that exists between S and sigma.

Thanks!

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# Using 2nd-Piola-Kirchoff stress rather than Cauchy

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