Modeling anisotropic and rate-dependent plasticity in short-fiber reinforced thermoplastics

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Abstract

In this study, an anisotropic viscoelastic-viscoplastic macro-mechanical model is presented for short-fiber reinforced thermoplastics (SFRT). In injection molding of SFRT, the fiber orientation is influenced by the flow velocity profile which varies through- out the mold. The flow-induced orientation in the microstructure leads to anisotropy in the mechanical response. In addition to the mechanical anisotropy, SFRTs show time dependent behavior because of the thermoplastic matrix. The developed model captures the effects of both material orientation and loading rate on the yield behavior. In this study, uniaxial tests are performed at different strain rates and material orientations with samples cut from injection molded plaques. The experimental results show that the effects of loading rate and material orientation on the yield are decoupled. The presented model takes advantage of this observation to simplify material characterization. An implicit integration scheme is used for the numerical implementation of the model as a UMAT in ABAQUS. Multiple relaxation times are used in order to capture the nonlinear pre-yield regime. An efficient method for obtaining the model parameters for different modes is proposed. Experimental results are used for validation of the model and a good agreement is observed for the prediction of viscoelastic and viscoplastic behavior.
Original languageEnglish
Title of host publicationXV International Conference on Computational Plasticity. Fundamentals and Applications. (COMPLAS 2019)
EditorsE. Oñate, D.R.J. Owen, M. Peric, M. Chiumenti, E. de Souza Neto
Place of PublicationBarcelona
PublisherInternational Center for Numerical Methods in Engineering (CIMNE)
Pages385-394
Number of pages10
ISBN (Electronic)978-84-949194-7-3
Publication statusPublished - Sep 2019
EventXV International Conference on
Computational Plasticity.
Fundamentals and Applications
- Barcelona, Spain
Duration: 3 Sep 20195 Sep 2019

Conference

ConferenceXV International Conference on
Computational Plasticity.
Fundamentals and Applications
Abbreviated titleCOMPLAS 2019
CountrySpain
CityBarcelona
Period3/09/195/09/19

Keywords

  • Short-Fiber Composites
  • Rate-Dependent Plasticity
  • Computational Mechanics
  • Constitutive Modeling

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