所属单位：航空学院
发表刊物：SMART MATERIALS AND STRUCTURES
关键字：shape memory polymers nonlinear thermal expansion fractional derivative theory
摘要：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号：0964-1726
是否译文：否
发表时间：2018-03-01
合写作者：Zeng, Hao,Xie, Zhimin,Gu, Jianping
通讯作者：Xie, Zhimin,孙慧玉,孙慧玉
发表时间：2018-03-01