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Thermo-Mechanically Coupled Thermo-Elasto-Visco-Plastic Modeling of Thermo-Induced Shape Memory Polyurethane at Finite Deformation

查看全文 作　　者：Jian [1]Li;Qian-hua [1]Kan;Ze-bin [2]Zhang;Guo-zheng [1]Kang;Wenyi [3]Yan 高影响力作者 机构地区：[1]State Key Laboratory of Traction Power,Southwest Jiaotong University;[2]Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province,School of Mechanics and Engineering,Southwest Jiaotong University;[3]Department of Mechanical and Aerospace Engineering,Monash University高影响力机构 出　　处：《Acta Mechanica Solida Sinica》索引2018年第31卷第2期,共20页高影响力期刊 基　　金：Financial supports by National Natural Science Foundation of China (11572265,11202171);Excellent Youth Found of Sichuan Province (2017JQ0019);Open Project of Traction Power State Key Laboratory(TPL1606);Exploration Project of Traction Power State Key Laboratory (2017TPL_T04) 摘　　要：A series of mono tonic tensile experiments of thermo-induced shape memory polyurethane(TSMPU) at different loading rates were carried out to investigate the interaction between the internal heat production and the mechanical deformation. It is shown that the temperature variation on the surfaces of the specimens due to the internal heat production affects the mechanical properties of TSMPU remarkably. Then, based on irreversible thermodynamics, the Helmholtz free energy was decomposed into three parts, i.e., the instantaneous elastic free energy,visco-plastic free energy and heat free energy. The total deformation gradient was decomposed into the mechanical and thermal parts, and the mechanical deformation gradient was further divided into the elastic and visco-plastic components. The Hencky's logarithmic strain was used in the current configuration. The heat equilibrium equation of internal heat production and heat exchange was derived in accordance with the first and second thermodynamics laws. The temperature of specimens was contributed by the internal heat, production and the ambient temperature simultaneously, and a thermo-mechanic ally coupled thermo-elas to-visco-plastic model was established. The effect of temperature variation of specimens on the mechanical properties of the material was considered in this work. Finally, the capability of the proposed model was validated by comparing the simulated results with the corresponding experimental data of TSMPU. 关 键 词：形状记忆聚氨酯 机械性质 模特儿 Hencky 温度变化 相互作用 热力学 生产
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