Deformable continua in an Euclidean space are characterized by the first Piola-Kirchhoff stress tensor. In doing so it is assumed that the continuum forms a connected, smooth and oriented Riemannian submanifold M of IR n with boundary M. Taking (covariant) divergence of the tensor a (assumed to be smooth) yields the internal force density on M. The internal force density caused on M is (n) with n the oriented unit normal of M in M. (Fortsetzung s. Original-Dokument)
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