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Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2010, Vol. 11 Issue (10): 804-810    DOI: 10.1631/jzus.A1000131
    
Experimental study on uniaxial time-dependent ratcheting of a polyetherimide polymer
Dou-xing Pan, Guo-zheng Kang, Zhi-wu Zhu, Yu-jie Liu
School of Mechanics and Engineering, Southwest Jiaotong University, Chengdu 610031, China
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Abstract  The uniaxial ratcheting behavior of a polyetherimide (PEI) polymer ‘TECAPEI’ was studied using stress-controlled cyclic loading at room temperature, including both cyclic tension-compression with non-zero tensile mean stress and tension-unloading tests. The experimental observations were focused on the time-dependent ratcheting of the PEI polymer revealed in cyclic tests at diverse stress rates and with different peak stress holding times. The results showed that the PEI polymer shows obvious ratcheting deformation; i.e., the ratcheting strain accumulates progressively in the tensile direction during stress-controlled cyclic tests with non-zero mean stress. The ratcheting is highly dependent on the applied mean stress and stress amplitude, and is also characterized by a strong time-dependency during the cyclic stressing at diverse stress rates and with different peak stress holding times. The time-dependent ratcheting of the PEI polymer is caused mainly by its remarkable viscosity. A comparison of the ratcheting occurring before and beyond the ultimate stress point of the PEI polymer showed that the ratcheting beyond the ultimate stress point is more significant than that occurring before that point.

Key wordsPolyetherimide (PEI) polymer      Uniaxial ratcheting      Time-dependence      Cyclic loading      Viscosity     
Received: 29 March 2010      Published: 05 October 2010
CLC:  O344  
Cite this article:

Dou-xing Pan, Guo-zheng Kang, Zhi-wu Zhu, Yu-jie Liu. Experimental study on uniaxial time-dependent ratcheting of a polyetherimide polymer. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2010, 11(10): 804-810.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.A1000131     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2010/V11/I10/804

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