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Analysis and Characterization of Damage Utilizing an Orthotropic 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 usage in the aerospace and automotive communities. In order to address a series of issues identified by the aerospace community as being desirable to include in a next generation composite impact model, an orthotropic, macroscopic constitutive model incorporating both plasticity and damage suitable for implementation within the commercial LS-DYNA computer code is being developed. The plasticity model is based on extending the Tsai-Wu composite failure model into a strain hardening-based orthotropic plasticity model with a non-associative flow rule. The evolution of the yield surface is determined based on tabulated stress-strain curves in the various normal and shear directions and is tracked using the effective plastic strain. To compute the evolution of damage, a strain equivalent semi-coupled formulation is used in which a load in one direction results in a stiffness reduction in multiple material coordinate directions. A detailed analysis is carried out to ensure that the strain equivalence assumption is appropriate for the derived plasticity and damage formulations that are employed in the current model. Procedures to develop the appropriate input curves for the damage model are presented and the process required to develop an appropriate characterization test matrix is discussed.
Document ID
20160002089
Acquisition Source
Glenn Research Center
Document Type
Technical Memorandum (TM)
Authors
Goldberg, Robert K. (NASA Glenn Research Center Cleveland, OH United States)
Carney, Kelly S. (NASA Glenn Research Center Cleveland, OH United States)
DuBois, Paul (George Mason Univ. Fairfax, VA, United States)
Hoffarth, Canio (Arizona State Univ. Tempe, AZ, United States)
Rajan, Subramaniam (Arizona State Univ. Tempe, AZ, United States)
Blankenhorn, Gunther (Livermore Software Technology Corp. CA, United States)
Date Acquired
February 19, 2016
Publication Date
February 1, 2016
Subject Category
Structural Mechanics
Composite Materials
Report/Patent Number
NASA/TM-2016-218959
E-19196
GRC-E-DAA-TN29072
Meeting Information
Meeting: Earth and Space Conference
Location: Orlando, FL
Country: United States
Start Date: April 11, 2016
End Date: April 15, 2016
Sponsors: American Society of Civil Engineers
Funding Number(s)
WBS: WBS 826611.04.03.01
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
Impact
Polymer Matrix Composites
Finite Element Method

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