MATEC Web Conf.
Volume 300, 2019ICMFF12 - 12th International Conference on Multiaxial Fatigue and Fracture
|Number of page(s)||8|
|Section||LCF or Cyclic Behaviour|
|Published online||02 December 2019|
Regularizational approach for modeling ductile damage
Institute of Mechanics, TU Dortmund University, D-44227 Dortmund, Germany
2 Department of Materials Test Engineering, TU Dortmund University, D-44227 Dortmund, Germany
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It is well known, that modeling of material softening behavior can lead to ill-posed boundary value problems. This, in turn, leads to meshdependent results as far as the finite-element-method is concerned . Several solution strategies in order to regularize the aforementioned problem have been proposed in the literature, cf. . However, these strategies often involve high implementational effort. An approach which is very efficient froman implementational point of view is the so-called micromorphic approach by [3, 4]. This regularization technique includes gradients of internal variables implicitly into the framework, while preserving the original structure of the underlying local constitutive model. However, it is shown that a straightforward implementation of the micromorphic approach does not work for single-surface ductile damage models. By analyzing the respective equations, a modification of the micromorphic approach is proposed – first for a scalar internal variable, i.e., isotropic damage. Subsequently, the novel regularization method is extended to tensor valued damage, i.e., anisotropic material degradation.
© The Authors, published by EDP Sciences, 2019
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