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Implementation of a Tabulated Failure Model Into a Generalized Composite Material Model Suitable for Use in Impact ProblemsThe need for accurate material models to simulate the deformation, damage and failure of polymer matrix composites under impact conditions is becoming critical as these materials are gaining increased use in the aerospace and automotive communities. The aerospace community has identified several key capabilities which are currently lacking in the available material models in commercial transient dynamic finite element codes. To attempt to improve the predictive capability of composite impact simulations, a next generation material model is being developed for incorporation within the commercial transient dynamic finite element code LS-DYNA. The material model, which incorporates plasticity, damage and failure, utilizes experimentally based tabulated input to define the evolution of plasticity and damage and the initiation of failure as opposed to specifying discrete input parameters such as modulus and strength. The plasticity portion of the orthotropic, three-dimensional, macroscopic composite constitutive model is based on an extension of the Tsai-Wu composite failure model into a generalized yield function with a non-associative flow rule. For the damage model, a strain equivalent formulation is used to allow for the uncoupling of the deformation and damage analyses. For the failure model, a tabulated approach is utilized in which a stress or strain based invariant is defined as a function of the location of the current stress state in stress space to define the initiation of failure. Failure surfaces can be defined with any arbitrary shape, unlike traditional failure models where the mathematical functions used to define the failure surface impose a specific shape on the failure surface. In the current paper, the complete development of the failure model is described and the generation of a tabulated failure surface for a representative composite material is discussed.
Document ID
20170008799
Acquisition Source
Glenn Research Center
Document Type
Conference Paper
Authors
Goldberg, Robert K. (NASA Glenn Research Center Cleveland, OH United States)
Carney, Kelly S. (George Mason Univ. Fairfax, VA, United States)
Dubois, Paul (George Mason Univ. Fairfax, VA, United States)
Hoffarth, Canio (Arizona State Univ. Tempe, AZ, United States)
Khaled, Bilal (Arizona State Univ. Tempe, AZ, United States)
Shyamsunder, Loukham (Arizona State Univ. Tempe, AZ, United States)
Rajan, Subramaniam (Arizona State Univ. Tempe, AZ, United States)
Blankenhorn, Gunther (Livermore Software Technology)
Date Acquired
September 14, 2017
Publication Date
October 23, 2017
Subject Category
Structural Mechanics
Report/Patent Number
Paper Number 51
GRC-E-DAA-TN44724
Meeting Information
Meeting: American Society for Composites (ASC) Technical Conference
Location: West Lafayette, IN
Country: United States
Start Date: October 23, 2017
End Date: October 25, 2017
Sponsors: American Society for Composites
Funding Number(s)
WBS: WBS 826611.04.03.01
CONTRACT_GRANT: NN15CA32C
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
polymer matrix composites
finite element method
impact

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