A visco-elastoplastic constitutive model of aircraft polymethylmethacrylate related to strain rate and temperature  

作　　者：Bo ZHANG Yanke LIU Haoyu YU Yuansong ZENG Lihui LANG Yong LI 

机构地区：[1]School of Mechanical Engineering and Automation,Beihang University,Beijing 100191,China [2]Departmentof Material Application Researching,AVIC Manufacturing Technology Institute,Beijing 00024,China

出　　处：《Chinese Journal of Aeronautics》2023年第6期435-445,共11页中国航空学报（英文版）

摘　　要：The visco-elastoplastic mechanical behavior related to the applied strain rate and temperature around the glass transition temperature of Polymethylmethacrylate(PMMA)has been systematically investigated.The uniaxial tensile test was performed at strain rate and temperature rangs 1.0×10^(-4)-1.0×10^(-2)s^(-1)and 363-393 K,respectively,and the Dynamic Mechanical Analysis(DMA)test was carried out between 363 K and 413 K at various frequencies.Moreover,the robust complex constitutive model considering the temperature and strain rate effect is proposed.A nonlinear viscoelastic model is established to describe the viscoelastic response on the basis of the Zhu-Wang-Tang(ZWT)model and the time temperature equivalence principle,including the dependence of strain rate and temperature.Considering the yield stress,the cooperative model is adopted.The viscoplastic mechanical response is manifested as the competition performance of the softening deformation and hardening behavior.The predicted mechanical responses maintain good consistency with the experimental results,indicating that the visco-elastoplastic constitutive model proposed can accurately predict the mechanical behavior of PMMA materials within the imposed strain rate and near the glass transition temperature range.

关 键 词：Constitutive model Mechanical response POLYMETHYLMETHACRYLATE VISCOELASTIC VISCOPLASTIC 

分 类 号：V255[一般工业技术—材料科学与工程]