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49,80 €ISBN 978-3-8440-6974-7Softcover250 pages94 figures325 g21 x 14,8 cmEnglishThesis
October 2019
Marek Fassin
Modeling of gradient-extended anisotropic damage using a second order damage tensor
Numerical simulations are indispensible in many engineering disciplines since they can reduce the number of costly and time-consuming experiments. For the prediction of material and structural failure, damage and fracture models have been developed, which are constantly being further extended to consider more and more effects. State-of-the-art isotropic damage models apply scalar variables to describe damage/degradation of a material. Anisotropic damage models have already been developed for quite a time, but in this research field still pending issues exist. One challenging task concerns the mesh-objective description of anisotropic damage progression in finite element simulations. The present cumulative dissertation consists of three peer-reviewed articles that deal with state-of-the-art isotropic damage as well as anisotropic damage representations. In article 1, an application oriented design study utilizing a local isotropic damage model is presented. The other two articles (article 2 and 3) deal with gradient-extended anisotropic damage, for which a new formulation is established.
Keywords: isotropic damage; anisotropic damage; gradient damage; micromorphic approach; mesh regularization; dissipation potential; crack closure; unilateral effect
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