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《Acta Mechanica Solida Sinica》 2001-03
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TIME-TEMPERATURE-STRESS EQUIVALENCE AND ITS APPLICATION TO NONLINEAR VISCOELASTIC MATERIALS

Luo Wenbo 1,2 Yang Tingqing 1 An Qunli 1 ( 1 Department of Mechanics, Huazhong University of Science and Technology, Wuhan, 430074) ( 2 Institute of Fundamental Mechanics and Material Engineering, Xiangtan University, Xiangtan, 411105)  
Stress dependence of the characteristic time of viscoelastic materials was investigated. The influence of stress level on the characteristic time is considered to be similar to those of temperature, pressure, solvent concentration, damage and physical aging. The time temperature stress equivalence principle is presented. By using the equivalence principle, the creep curves under different temperature and stress levels can be shifted into a master curve at reference temperature and stress state. Thus the long-term creep behavior of viscoelastic materials under lower temperature and stress can be predicted from the short term one under higher temperature and stress. As an example, the nonlinear creep behavior of high density polyethylene (HDPE) under room temperature was studied using the presented time stress equivalence principle.
【Fund】: 国家自然科学基金 (196 32 0 30 );; 湖南省教委高等学校科研项目 (99C12 2 )资助
【CateGory Index】: TB301
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