A test procedure for separating viscous recovery and accumulated unrecoverable deformation of polymer under cyclic loading

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• 作者：Han Jiang ; Jianwei Zhang ; Guozheng Kang ; Congcong Xi ; Chengkai Jiang ; Yujie Liu
• 关键词：Polymeric material ; Mechanical testing ; Cyclic loading ; Viscous recovery deformation
• 刊名：Polymer Testing
• 出版年：December, 2013
• 年：2013
• 卷：32
• 期：8
• 页码：1445-1451
• 全文大小：1475 K

文摘

After uniaxial tension and creep tests, asymmetric stress cycle tests have been performed on two polycarbonate (PC) materials with different molecular weights at room temperature. The effects of stress level (mean stress and stress amplitude) and time-dependent factors (stress rate and peak hold time) on ratcheting were studied. To separate the contributions of viscous recovery and accumulated unrecoverable deformation, a new test procedure has been proposed and performed on polycarbonate. The results demonstrate that the proposed test procedure is suitable for separating the viscous recovery and accumulated unrecoverable deformation. The study clearly shows that, for PC, both the viscous recovery and the accumulated unrecoverable deformation cannot be neglected for cyclic loading; previous viscous deformation has significant influence on the following cyclic accumulated deformation.