United States Department of Transportation
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Development of a Tabulated Material Model for Composite Material Failure, MAT213: Part 1: Theory, Implementation, Verification & Validation
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2020-01-01
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[PDF-3.52 MB]
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Abstract:One of the challenges in building a predictive numerical model for composites is the ability to accurately model the behavior of the structure, especially under impact loading. This report provides details of a newly developed orthotropic material model that has three distinct sub-models for describing deformation, damage, and failure of general composites, and has been implemented in the commercial finite element program, LS-DYNA, as *MAT_213 (*MAT_COMPOSITE_TABULATED_PLASTICITY_DAMAGE). The model is driven by tabulated data that can be generated using laboratory tests or via virtual testing. The yield function is a modified form the Tsai-Wu failure model. A non-associated plastic flow is used. Rate and temperature dependence are supported along with tension-compression asymmetric behavior. The damage sub-model allows for both uncoupled and coupled parameters to be defined. Strain equivalence between the true and the effective stress space permits decoupling the plasticity and damage calculations. The failure modeling is currently being enhanced, and the initial version discussed in this report includes some of the most commonly used failure criteria – principal strain, Tsai-Wu, and a generalized tabulated laminate failure criterion.
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