A stress integration algorithm for phase transforming steels


Perdahcioglu, E.S. and Geijselaers, H.J.M. and Huetink, J. (2007) A stress integration algorithm for phase transforming steels. In: IX international conference on computational plasticity COMPLAS, 2007, Barcelona.

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Abstract:A new stress integration algorithm for the constitutive models of materials that
undergo strain-induced phase transformation is presented. The most common materials that
fall into this category are metastable austenitic stainless (TRIP) steels. These materials can
be classi¯ed as metal-matrix composites which comprise a soft and a hard metallic phase. A
homogenization algorithm is presented that can estimate the evolution of state variables in each
phase for a given strain increment. The elastic-plastic behavior of the phases are calculated
individually using large deformation theory and the calculated algorithmic tangent moduli are
used in different homogenization schemes. Furthermore, the phase transformation process in
austenitic stainless steels involves a volumetric expansion and an inelastic shape change collinear
with the deviatoric stress. This transformation plasticity is approximated by a phenomenological
model and incorporated in the stress update algorithm.
Item Type:Conference or Workshop Item
Copyright:(c) UT Universiteit Twente, 2007
Engineering Technology (CTW)
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Link to this item:http://purl.utwente.nl/publications/69670
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