摘要
为研究有机玻璃(polymethyl methacrylate,PMMA)耗散能随预应变增加的演化规律及其与应变率的关系,进行了不同应变率下的循环加卸载压缩试验,分析了相应的应力应变曲线;讨论了不同应变率下每次循环耗散能密度的变化规律,提出了一个幂指数模型,并在这些耗散能密度的基础上拟合该模型的参数,研究拟合参数的变化趋势及其影响因素。结果表明,预应变与黏性呈负相关,应变率与应变软化呈正相关。拟合曲线与试验数据吻合良好,该模型可以有效预测有机玻璃耗散能的变化趋势。
In order to research on the evolution law of dissipation energy of polymethyl methacrylate(PMMA)with increasing pre-strain and its relationship with strain rate,cyclic loading and unloading compression tests with different strain rates were carried out.The variation law of dissipation energy density of each cycle under different strain rates was discussed,a power exponential model was proposed,and the parameters of the model were fitted on the basis of these dissipation energy densities.The trend of the fitting parameters and its influencing factors were studied.The results show that the pre-strain is negatively correlated with viscosity and the strain rate is positively correlated with strain softening.The fitting curve agrees well with the experimental data,the model can effectively predict the variation trend of PMMA dissipative energy.
作者
杨海庆
邱吉
金涛
树学峰
YANG Hai-qing;QIU Ji;JIN Tao;SHU Xue-feng(Institute of Applied Mechanics,College of Mechanical and Vehicle Engineering,Taiyuan University of Technology,Taiyuan 030024,China)
出处
《科学技术与工程》
北大核心
2019年第30期16-20,共5页
Science Technology and Engineering
基金
国家自然科学基金(11772217)资助
关键词
有机玻璃
循环加卸载
耗散能密度
幂指数模型
应变率
PMMA
cyclic loading and unloading
dissipated energy density
power exponential model
strain rate
