Talk:Piola-Kirchhoff stress tensor

Definition of the Piola-Kirchhoff tensor in this article seems to be wrong, actually this stress related to the unstressed areas, whereas the Cauchy sress relates to the deformed state.

Message from OTRS: "Please, check that but I am almost sure that the Cauchy stress is related in the current (present configuration) both forces and areas not in reference configuration. "

The definition of the 2nd Piola stress tensor contains factual errors. The Cauchy stress tensor relates forces and areas in the current (or, deformed) configuration!