Piola-Kirchhoff stress tensors
= Piola-Kirchhoff stress tensors
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{wiki=Piola–Kirchhoff_stress_tensors}
= Piola-Kirchhoff stress tensor
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These <stress> measures refer force or area to the <reference configuration>. Different index-order conventions distinguish a <first Piola-Kirchhoff stress tensor> from its transposed <nominal stress tensor>. The <second Piola-Kirchhoff stress tensor> has two material indices.