Experimental characterization and thermoviscoelastic modeling of strain and stress recoveries of an amorphous polymer network

Abstract

is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. AbstractAn acrylate polymer network was submitted to thermomechanical shape memory cycles. The set of experiments characterized the material stress-free strain recovery and the strain-constrained stress recovery in uniaxial tension. Experimental parameters like temperature of strain fixation, amount of strain and heating rate, were varied in order to provide a relatively complete set of experimental data. A model combining the amorphous polymer viscoelasticity and its time-temperature superposition property was used to predict the shape memory behavior of the acrylate polymer network. All the model parameters were characterized using classical tests for mechanical characterization of polymers, which do not include shape memory tests. Model predictions obtained by finite element simulations compared very well to the experimental data and therefore the model relevance for computer assisted application design was assessed.

Effect of the Network Structure and Programming Temperature on the Shape-Memory Response of Thiol-Epoxy “Click” Systems

“…In structural and aerospace applications [12,13] the capability to perform a mechanical work and the control of the shape-recovery process are highly demanded to properly tailor materials for specific conditions. However, one of the major drawbacks is to fulfil both, high ultimate strength and strain.…”

A unified modeling approach for amorphous shape memory polymers and shape memory polymer based syntactic foam

“…The viscoelasticity parameters are determined from the curve of the storage modulus values as a function of frequencies by using the method of nonlinear regularization. Arrieta et al extended the modeling approach to describe the large‐strain uniaxial tension SME of SMP . The simulations show good agreement with both the torsion and tension experimental shape memory thermomechanical cycle data.…”

Shape memory polymer S-shaped mandrel for composite air duct manufacturing

“…Yu et al predicted the free recovery behavior and multi-shape recovery behavior using a series of springs and dashpots in parallel and series, as the standard approach in linear viscoelasticity [35,36]. Diani et al have also analyzed the free recovery behavior of SMP materials under large torsion and tensile deformation using the viscoelastic approach [37,38]. The phase transition theory states that the SMP material can be described as a combination of an active and a frozen phase.…”

“…The phase transition model was developed by Liu et al and investigated the free and constraint recovery behavior of pure SMPs and SMP composites [39,40], Guo et al also investigated the change of volume fraction of the frozen phase under stress for a thermally-induced SMP material [41]. Based on Diani work [38], the general Maxwell model is applied in this work to express the viscoelastic properties with 8 time-temperature superposition properties [38,42]. The resultant relaxation modulus and time are implemented into the ABAQUS software during the shape deformation simulation.…”