A relaxation-based approach to damage modeling

Klaus Hackl, Ruhr-Universit├Ąt Bochum, Bochum, Germany

Material models exhibiting softening effects due to, for example, damage and localization, share the problem of leading to ill-posed boundary value problems. It is thus necessary to apply regularization techniques that couple local behavior described, for example, by internal variables at a spatial level. This can be done taking into account higher gradients of the internal variables. In this talk, we present a new approach to damage modeling that does not use common field functions, inclusion of gradients or complex integration techniques but appropriate modifications of the relaxed (condensed) energy. It possesses the same advantages as other methods, but with much less numerical effort.We start with the theoretical derivation and then discuss the numerical treatment. Finally, we present finite element results that prove empirically how the new approach works.

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Session M2: Moday, 25 June 2018

Start: 03:45 p.m.
End: 04:00 p.m.