TY - CONF

T1 - An invariant-based anisotropic thermo-plastic material model for short fiber reinforced thermoplastics

AU - Dean, A.

AU - Reinoso, J.

AU - Sahraee, S.

AU - Rolfes, R.

N1 - Funding Information: This paper is dedicated to Dr. Abdlatif Dean and Mrs. Dean for their unfailing support and sound advice. Many thanks also go to Dr.-Ing. Matthias Vogler for his helpful comments and discussion. RR and AD would like to acknowledge the German Research Foundation (DFG) for the financial support through the priority program 164 „joining by plastic deformation‟ with contract No. RO 706/6-1. JR gratefully acknowledges the support of the Spanish Ministry of Economy and Competitiveness (DPI2012-37187) and Andalusian Government (Project of Exc. No. TEP-7093). Publisher Copyright: © 2015 International Committee on Composite Materials. All rights reserved.

PY - 2015

Y1 - 2015

N2 - This paper is concerned with the development of a new coupled thermomechanical invariant-based transversely-isotropic elastic-plastic constitutive model for short fibre reinforced composites. The invariant-based character of the developed model under multiaxial loading conditions allows the incorporation of the direction-dependent response of short fibre composites that result from the employed injection molding process. The nonlinear behavior of such composites is regarded using an anisotropic yield surface and non-associative plastic potential functions. From the computational standpoint, this novel coupled thermo-mechanical formulation is incorporated into the FE code FEAP through the user subroutine UEL, i.e. the constitutive model is integrated within a user-defined element. Finally, the model is examined by means of a simple benchmark test that shows the potential capabilities of the present formulation. This application is focused on the short fiber reinforced thermoplastic PA6GF30 that is typically used in a wide set of engineering applications, especially in car bodies and aeronautical constructions.

AB - This paper is concerned with the development of a new coupled thermomechanical invariant-based transversely-isotropic elastic-plastic constitutive model for short fibre reinforced composites. The invariant-based character of the developed model under multiaxial loading conditions allows the incorporation of the direction-dependent response of short fibre composites that result from the employed injection molding process. The nonlinear behavior of such composites is regarded using an anisotropic yield surface and non-associative plastic potential functions. From the computational standpoint, this novel coupled thermo-mechanical formulation is incorporated into the FE code FEAP through the user subroutine UEL, i.e. the constitutive model is integrated within a user-defined element. Finally, the model is examined by means of a simple benchmark test that shows the potential capabilities of the present formulation. This application is focused on the short fiber reinforced thermoplastic PA6GF30 that is typically used in a wide set of engineering applications, especially in car bodies and aeronautical constructions.

KW - Finite element method (FEM)

KW - Short fiber reinforced thermoplastics

KW - Thermo-mechanical coupling

KW - Transversely isotropic thermo-plasticity

UR - http://www.scopus.com/inward/record.url?scp=84994152869&partnerID=8YFLogxK

M3 - Paper

T2 - 20th International Conference on Composite Materials, ICCM 2015

Y2 - 19 July 2015 through 24 July 2015

ER -