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Affiliation of Author(s):航空学院

Title of Paper:A 1D thermomechanical network transition constitutive model coupled with multiple structural relaxation for shape memory polymers

Journal:SMART MATERIALS AND STRUCTURES

Key Words:shape memory polymers nonlinear thermal expansion fractional derivative theory

Abstract:A new thermomechanical network transition constitutive model is proposed in the study to describe the viscoelastic behavior of shape memory polymers (SMPs). Based on the microstructure of semi-crystalline SMPs, a new simplified transformation equation is proposed to describe the transform of transient networks. And the generalized fractional Maxwell model is introduced in the paper to estimate the temperature-dependent storage modulus. In addition, a neo-KAHR theory with multiple discrete relaxation processes is put forward to study the structural relaxation of the nonlinear thermal strain in cooling/heating processes. The evolution equations of the time- and temperature-dependent stress and strain response are developed. In the model, the thermodynamical and mechanical characteristics of SMPs in the typical thermomechanical cycle are described clearly and the irreversible deformation is studied in detail. Finally, the typical thermomechanical cycles are simulated using the present constitutive model, and the simulation results agree well with the experimental results.

ISSN No.:0964-1726

Translation or Not:no

Date of Publication:2018-03-01

Co-author:Zeng, Hao,Xie, Zhimin,Gu, Jianping

Correspondence Author:Xie, Zhimin,孙慧玉,Sun Huiyu