Journal
THEORETICAL AND APPLIED FRACTURE MECHANICS
Volume 108, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.tafmec.2020.102642
Keywords
Transversal isotropy; Gradient damage; Anisotropic damage; Tension-compression asymmetry; Finite strains; Coupled damage-plasticity
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Funding
- German Science Foundation (DFG) [RE 1057/46-1]
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An anisotropic, in particular transversal isotropic, thermodynamically consistent material model for unidirectional fiber composite layers at finite strain is proposed. To account for the anisotropy, the concept of structural tensors is used. Tension-compression asymmetric fiber damage as well as an elasto-plastic-damage matrix material are discussed, whereas plasticity and damage are modeled by a two-surface approach. Anisotropic damage is modeled by utilizing three scalar, local damage variables. In this context, mesh-independent damage evolution is achieved using the micromorphic approach presented by [34,35], separately for the fiber and the matrix part. Further, an element formulation including the additional micromorphic degrees of freedom and its linearization for the global Newton-Raphson scheme are presented. Numerical examples show the behavior of the presented material model at the Gauss point and structural level.
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