TY - GEN
T1 - Incorporation of plasticity and damage into an orthotropic three-dimensional model with tabulated input suitable for use in composite impact problems
AU - Goldberg, R. K.
AU - Carney, K. S.
AU - Dubois, P.
AU - Hoffarth, C.
AU - Rajan, Subramaniam
AU - Blankenhorn, G.
N1 - Funding Information:
Authors Hoffarth and Rajan gratefully acknowledge the support of the Federal Aviation Administration through Grant #12-G-001 entitled "Composite Material Model for Impact Analysis", William Emmerling, Technical Monitor.
Publisher Copyright:
Copyright © 2015 by DEStech Publications, Inc. and American Society for Composites. All rights reserved.
PY - 2015
Y1 - 2015
N2 - The 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 industries. While there are several composite material models currently available within commercial transient dynamic finite element codes, several features have been identified as being lacking in the currently available material models that could increase the predictive capability of the impact simulations. A specific desired feature includes the incorporation of both plasticity and damage within the material model. Another desired feature includes using experimentally based tabulated stress-strain input to define the evolution of plasticity and damage as opposed to specifying discrete input parameters (such as modulus and strength) and employing analytical functions to track the response of the material. To begin to address these needs, a combined plasticity and damage model suitable for use with both solid and shell elements is being developed for implementation within the commercial code LS-DYNA. 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. The effective plastic strain is computed by using the non-associative flow rule in combination with appropriate numerical methods. 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 coordinate directions. A specific laminated composite is examined to demonstrate the process of characterizing and analyzing the response of a composite using the developed model.
AB - The 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 industries. While there are several composite material models currently available within commercial transient dynamic finite element codes, several features have been identified as being lacking in the currently available material models that could increase the predictive capability of the impact simulations. A specific desired feature includes the incorporation of both plasticity and damage within the material model. Another desired feature includes using experimentally based tabulated stress-strain input to define the evolution of plasticity and damage as opposed to specifying discrete input parameters (such as modulus and strength) and employing analytical functions to track the response of the material. To begin to address these needs, a combined plasticity and damage model suitable for use with both solid and shell elements is being developed for implementation within the commercial code LS-DYNA. 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. The effective plastic strain is computed by using the non-associative flow rule in combination with appropriate numerical methods. 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 coordinate directions. A specific laminated composite is examined to demonstrate the process of characterizing and analyzing the response of a composite using the developed model.
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M3 - Conference contribution
AN - SCOPUS:84966586698
T3 - Proceedings of the American Society for Composites - 30th Technical Conference, ACS 2015
BT - Proceedings of the American Society for Composites - 30th Technical Conference, ACS 2015
A2 - Xiao, Xinran
A2 - Liu, Dahsin
A2 - Loos, Alfred
PB - DEStech Publications
T2 - 30th Annual Technical Conference of the American Society for Composites, ASC 2015
Y2 - 28 September 2015 through 30 September 2015
ER -