Development of a Tabulated Material Model for Composite Material Failure, MAT213 Part 2: Experimental Tests to Characterize the Behavior and Properties of T800-F3900 Toray Composite
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Development of a Tabulated Material Model for Composite Material Failure, MAT213 Part 2: Experimental Tests to Characterize the Behavior and Properties of T800-F3900 Toray Composite

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      One of the challenges in building a predictive numerical model for composites is the ability to model accurately the behavior of the structure, especially under impact loading. This report describes a newly developed orthotropic material model that has three distinct sub-models for deformation, damage, and failure of general composites. This model has been implemented in the commercial finite element program—LS-DYNA—as *MAT_213 (*MAT_COMPOSITE_TABULATED_PLASTICITY _DAMAGE). Tabulated data can be generated for this model using laboratory tests or via virtual testing. The yield function is a modified form of 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 enables uncoupled and coupled parameters to be defined. Strain equivalence between the true and the effective stress space permits decoupling of the plasticity and damage calculations. The failure modeling is currently being enhanced, however, the initial version in this report describes some of the most commonly used failure criteria, including principal strain, Tsai-Wu, and a generalized tabulated laminate failure criterion. Part 1 describes the experimental procedures and results from characterizing a widely used aerospace composite–T800- F3900. Part 2 discusses the theory, implementation, verification, and validation of the MAT213 material model using the T800- F3900 composite as a test case. Verification tests are carried out using single and multiple element models. Validation tests are carried out using data from impact tests carried out at NASA-GRC, which involve T800-F3900 composite panels. Part 3 discusses the probabilistic modeling implementation in LS-DYNA to support MAT213 (via *DEFINE_STOCHASTIC_VARIATION_MAT213) and compares the results from deterministic and probabilistic modeling of impact events.
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