An overview of different types of composite material system
architectures and a brief review of progressive failure material
modeling methods used for structural analysis including failure
initiation and material degradation are presented. Different
failure initiation criteria and material degradation models are
described that define progressive failure formulations. These
progressive failure formulations are implemented in a user-defined
material model (or UMAT) for use with the ABAQUS/Standard1
nonlinear finite element analysis tool. The failure initiation
criteria include the maximum stress criteria, maximum strain
criteria, the Tsai-Wu failure polynomial, and the Hashin criteria.
The material degradation model is based on the ply-discounting
approach where the local material constitutive coefficients are
degraded. Applications and extensions of the progressive failure
analysis material model address two-dimensional plate and shell
finite elements and three-dimensional solid finite elements.
Implementation details and use of the UMAT subroutine are described
in the present paper. Parametric studies for composite structures
are discussed to illustrate the features of the progressive failure
modeling methods that have been implemented.
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