Abstract
This repository contains a UMAT subroutine for modelling orthotropic behaviour with brittle failure for tension in the x-direction, ellipsoid elastoplastic behaviour for compression in grain direction (x-direction), and bilinear elastoplastic behaviour for shear in the xy-, xz-, and yz-planes. A stress interaction is only considered for the three shear components. The UMAT subroutine was developed in the dissertation of Janusch Töpler. For more information see Annex D of the dissertation.
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