LONG-TERM CREEP ASSESSMENT OF VISCOELASTIC POLYMER BY TIME-TEMPERATURE-STRESS SUPERPOSITION  

作　　者：Wenbo Luo Chuhong Wang Xiaoling Hu Tingqing Yang 

机构地区：[1]College of Civil Engineering and Mechanics, Xiangtan University [2]Department of Mechanics, Huazhong University of Science and Technology

出　　处：《Acta Mechanica Solida Sinica》2012年第6期571-578,共8页固体力学学报（英文版）

基　　金：supported by NSFC(No. 11172256);NCET (No. NCET-08-0685);Key Project of Chinese Ministry of Education (No. 209085);Aid Program for Science and Technology Innovative Research Team in Higher Educational Institutions of Hunan Province

摘　　要：Nonlinear viscoelastic creep properties of poly （methyl methacrylate） at various temperatures and stress levels were measured in short-term tests to check the applicability of time-temperature-stress superposition principle, which is the combined form of time-temperature superposition principle and time-stress superposition principle. A unified master creep compli- ance curve was constructed from the short-term tests by joint application of time-temperature superposition and time-stress superposition. The unified master curve establishes the creep com- pliance over two years, which is 4.2 decades longer than the test duration. Moreover, it is verified that in nonlinear viscoelastic cases, the time-temperature shift factors are dependent on stresses at which the shifts are applied, while the time-stress shift factors are dependent on temperatures.Nonlinear viscoelastic creep properties of poly （methyl methacrylate） at various temperatures and stress levels were measured in short-term tests to check the applicability of time-temperature-stress superposition principle, which is the combined form of time-temperature superposition principle and time-stress superposition principle. A unified master creep compli- ance curve was constructed from the short-term tests by joint application of time-temperature superposition and time-stress superposition. The unified master curve establishes the creep com- pliance over two years, which is 4.2 decades longer than the test duration. Moreover, it is verified that in nonlinear viscoelastic cases, the time-temperature shift factors are dependent on stresses at which the shifts are applied, while the time-stress shift factors are dependent on temperatures.

关 键 词：TIME-DEPENDENT POLYMER VISCOELASTIC CREEP time-temperature-stress superposi-tion master curve pair-shift 

分 类 号：O344.6[理学—固体力学]