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Nonlinear finite element modelling of thermo-visco-plastic styrene and polyurethane shape memory polymer foams

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Version 2 2024-06-04, 11:39
Version 1 2021-03-16, 08:30
journal contribution
posted on 2024-06-04, 11:39 authored by HR Jarrah, Ali ZolfagharianAli Zolfagharian, R Hedayati, A Serjouei, M Bodaghi
This paper presents nonlinear finite element (FE) models to predict time- and temperature-dependent responses of shape memory polymer (SMP) foams in the large deformation regime. For the first time, an A SMP foam constitutive model is implemented in the ABAQUS FE package with the aid of a VUMAT subroutine to predict thermo-visco-plastic behaviors. A phenomenological constitutive model is reformulated adopting a multiplicative decomposition of the deformation gradient into thermal and mechanical parts considering visco-plastic SMP matrix and glass microsphere inclusions. The stress split scheme is considered by a Maxwell element in parallel with a hyper-elastic rubbery spring. The Eyring dashpot is used for modelling the isotropic resistance to the local molecular rearrangement such as chain rotation. A viscous flow rule is adopted to prescribe shear viscosity and stress. An evolution rule is also considered for the athermal shear strengths to simulate macroscopic post-yield strain-softening behavior. In order to validate the accuracy of the model as well as the solution procedure, the numerical results are compared to experimental responses of Styrene and Polyurethane SMP foams at different temperatures and under different strain rates. The results show that the introduced FE modelling procedure is capable of capturing the major phenomena observed in experiments such as elastic and elastic-plastic behaviors, softening plateau regime, and densification.

History

Journal

Actuators

Volume

10

Article number

ARTN 46

Pagination

1-20

Location

Basel, Switzerland

Open access

  • Yes

eISSN

2076-0825

Language

English

Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

2021, The Authors

Issue

3

Publisher

MDPI