An internal state variable thermodynamic model for determining the Taylor-Quinney coefficient of glassy polymers

作者：Shao, Guojian; Zhu, Shengxin; Wang, Yana^*; Zhao, Qilin^*

来源：International Journal of Mechanical Sciences, 2017, 126: 261-269.

DOI：10.1016/j.ijmecsci.2017.03.026

• Thermodynamic
• Glassy polymer
• Taylor-Quinney coefficient
• Strain softening
• Strain hardening
• One-parameter method

In this study, a theoretical model was established for predicting the evolution of the Taylor-Quinney coefficient (beta) for glassy polymers, according to the internal state variables thermodynamic framework. The proposed model considers both the strain -softening and the strain-hardening processes simultaneously, making it different from and more complex than previous models. It was found that beta depends on both the strain and the strain rate. The Taylor-Quinney coefficient first increases to the maximum value and then decreases with increasing strain, which accords with the experimental results for different strain rates. The evolution of the Taylor-Quinney coefficient was caused by the competition mechanism between the strain -softening part and the strain-hardening part. A simple one-parameter method for predicting the temperature increase at different strain rates was proposed, which fits well with the experimental data and can be applied in practice.

• 出版日期2017-6
• 单位河海大学; 北京理工大学