scholarly journals Thermodynamic and viscoelastic constitutive model of TPI/HDPE hybrid shape memory polymer

2021 ◽  
Vol 103 ◽  
pp. 107349
Author(s):  
Jianxin Teng ◽  
Benzhi Min ◽  
Zhenqing Wang ◽  
Xiaoyu Sun
Keyword(s):  
Constitutive Model ◽  
Shape Memory ◽  
Shape Memory Polymer ◽  
Viscoelastic Constitutive Model

A macro-mechanical constitutive model for shape memory polymer

2010 ◽  
Vol 53 (12) ◽  
pp. 2266-2273 ◽  
Author(s):  
Bo Zhou ◽  
YanJu Liu ◽  
JinSong Leng
Keyword(s):  
Constitutive Model ◽  
Shape Memory ◽  
Shape Memory Polymer

scholarly journals A thermodynamics viscoelastic constitutive model for shape memory polymers

2017 ◽  
Vol 705 ◽  
pp. 146-155 ◽  
Author(s):  
Jianming Guo ◽  
Jingbiao Liu ◽  
Zhenqing Wang ◽  
Xiaofu He ◽  
Lifeng Hu ◽  
...  
Keyword(s):  
Constitutive Model ◽  
Shape Memory ◽  
Shape Memory Polymers ◽  
Viscoelastic Constitutive Model

Constitutive model for a stress- and thermal-induced phase transition in a shape memory polymer

2014 ◽  
Vol 23 (10) ◽  
pp. 105019 ◽  
Author(s):  
Xiaogang Guo ◽  
Liwu Liu ◽  
Yanju Liu ◽  
Bo Zhou ◽  
Jinsong Leng
Keyword(s):  
Phase Transition ◽  
Constitutive Model ◽  
Shape Memory ◽  
Shape Memory Polymer

A constitutive model for shape memory polymers with application to torsion of prismatic bars

2012 ◽  
Vol 23 (2) ◽  
pp. 107-116 ◽  
Author(s):  
Mostafa Baghani ◽  
Reza Naghdabadi ◽  
Jamal Arghavani ◽  
Saeed Sohrabpour
Keyword(s):  
Heat Transfer ◽  
Constitutive Model ◽  
Shape Memory ◽  
Shape Memory Polymer ◽  
Shape Memory Polymers ◽  
Second Law Of Thermodynamics ◽  
Considerable Effect ◽  
Heat Transfer Analysis ◽  
Internal Variables ◽  
Rate Dependent

In this article, satisfying the second law of thermodynamics, we present a 3D constitutive model for shape memory polymers. The model is based on an additive decomposition of the strain into four parts. Also, evolution laws for internal variables during both cooling and heating processes are proposed. Since temperature has considerable effect on the shape memory polymer behavior, for simulation of a shape memory polymer–based structure, it is required to perform a heat-transfer analysis. Commonly, an experimentally observed temperature rate–dependent behavior of shape memory polymers is justified by a rate-dependent glassy temperature, but using the heat-transfer analysis, it is shown that the glassy temperature could be considered as a constant material parameter. To this end, implementing the constitutive model within a nonlinear finite element code, we simulate torsion of a shape memory polymer rectangular bar and a circular tube. Moreover, we compare the predicted results with experimental data recently reported in the literature, which shows a good agreement.

scholarly journals Nonlinear Finite Element Modelling of Thermo-Visco-Plastic Styrene and Polyurethane Shape Memory Polymer Foams

Actuators ◽  
2021 ◽  
Vol 10 (3) ◽  
pp. 46
Author(s):  
Hamid Reza Jarrah ◽  
Ali Zolfagharian ◽  
Reza Hedayati ◽  
Ahmad Serjouei ◽  
Mahdi Bodaghi
Keyword(s):  
Finite Element ◽  
Constitutive Model ◽  
Shape Memory ◽  
Shape Memory Polymer ◽  
Deformation Gradient ◽  
Nonlinear Finite Element ◽  
Flow Rule ◽  
Fe Modelling ◽  
Yield Strain ◽  
Molecular Rearrangement

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.

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