A new interpretation of internal-variable theory in finite thermo-viscoelasticity  

作　　者：HUANG ZhuPing DUI GuanSuo YANG ShengYou 

机构地区：[1]Department of Mechanics and Engineering Science,Peking University [2]Institute of Engineering Mechanics,Beijing Jiaotong University

出　　处：《Science China Chemistry》2013年第3期610-616,共7页中国科学（化学英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 11132003,11172033,11272007 and 10932001);the National Basic Research Program of China (Grant No. 2010CB-7321004)

摘　　要：Based on the non-equilibrium thermodynamics,an internal-variable theory in thermo-viscoelasticity at finite deformation was proposed by Huang in 1999.In this theory,a modified stretch of the molecular chain was introduced,and hence the molecular network model in rubber elasticity was extended to take into account the viscous and thermal effects of the material.The viscous dissipation of the material can then be described by means of these internal variables,which appear in the expression of the modified stretch.In order to give a clearer explanation on the physical implication of the internal variables,a connection between the internal-variable theory and theoretical formulation based on the multiplicative decomposition of the deformation gradient in existing literature is presented in this paper,which allows the above internal-variable theory to be more systematic.Based on the non-equilibrium thermodynamics, an internal- variable theory in thermo-viscoelasticity at finite deformation was proposed by Huang in 1999. In this theory, a modified stretch of the molecular chain was introduced, and hence the molecular network model in rubber elasticity was extended to take into account the viscous and thermal effects of the material. The vis- cous dissipation of the material can then be described by means of these internal variables, which appear in the expression of the modified stretch. In order to give a clearer explanation on the physical implication of the internal variables, a connection between the internal-variable theory and theoretical formulation based on the multiplicative decomposition of the deformation gradient in existing literature is presented in this paper, which allows the above internal-variable theory to be more systematic.

关 键 词：thermo-viscoelasticity internal variables finite deformation multiplicative decomposition of the deformation gradient 

分 类 号：O345[理学—固体力学] O414.14[理学—力学]