Numerical Implementation of Polymer Viscoplastic Equations for High Strain-Rate Composite Models
Publication: Journal of Aerospace Engineering
Volume 22, Issue 3
Abstract
For polymer matrix composites subjected to large strain rates, it is important to correctly characterize the nonlinear and strain-rate dependent response of polymers. Viscoplastic constitutive material models have been developed to account for the effects of hydrostatic effects and inelastic strains in polymer materials. The effective implementation of such viscoplastic models is important for development of composite models geared toward practical applications. Goldberg’s polymer model numerical implementation into a commercial finite-element code constitutes the main objective of this paper. Special attention is given to the use of effective algorithms for solving the model nonlinear rate dependent viscoplastic equations. Existent experimental data are used to verify the accuracy and robustness of the computational polymer model. A phenomenological fiber model and a simplified iso-strain mixture theory used to obtain the resultant stresses in the composite by averaging the stresses of the individual constituents are also defined. The validation of the simplified mixture theory for the composite model will be presented later on.
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Acknowledgments
Thanks go to Boeing Company and the JDP program for supporting this work. Also special thanks go to Dr. Robert Goldberg for providing the writers with experimental data for the model implementation verification and for the useful comments during the course of this work.
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© 2009 ASCE.
History
Received: Jul 7, 2008
Accepted: Feb 5, 2009
Published online: Jun 15, 2009
Published in print: Jul 2009
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