温度与加载应力对双轴取向聚甲基丙烯酸甲酯蠕变行为的影响  

Effects of Temperature and Loading Stress on Creep Behavior of Biaxially Oriented Polymethylmethacrylate

作　　者：丁尧 张晓雯 郑梦瑶 相宁 颜悦 Yao Ding;Xiaowen Zhang;Mengyao Zheng;Ning Xiang;Yue Yan(Beijing Engineering Research Centre of Advanced Structure Transparencies for the Modern Traffic System,Beijing Institute of Aeronautical Materials,Beijing 100095,China)

机构地区：[1]北京航空材料研究院北京市先进运载系统结构透明件工程技术研究中心,北京100095

出　　处：《高分子材料科学与工程》2022年第3期81-88,共8页Polymer Materials Science & Engineering

基　　金：国家重点研发计划(2016YFC0300600,2019YFC0311600)。

摘　　要：考察了不同试验温度下YB-DM-11航空有机玻璃的拉伸性能,基于拉伸性能研究结果,在加载应力不超过对应温度下有机玻璃屈服强度的情况下,研究了蠕变温度和加载应力对有机玻璃蠕变行为的影响。结果表明,温度从25℃升至115℃,有机玻璃的屈服强度从85.69 MPa下降到9.89 MPa,降幅达88%。有机玻璃蠕变行为是温度、应力耦合作用的结果,升高温度或增加加载应力均能较大地提高有机玻璃的蠕变速率;通过降低蠕变温度或减小加载应力能有效地将有机玻璃蠕变过程控制在前2个阶段。采用广义蠕变方程和有效时间理论的蠕变模型对YB-DM-11航空有机玻璃前2个阶段的蠕变曲线进行拟合,所得拟合曲线与实验结果具有较高的重合度。The tensile properties of aeronautic polymethyl methacrylate YB-DM 11PMMA at different temperatures were investigated in this paper.Based on the results of tensile properties,the effects of creep temperature and loading stress on the creep behavior of PMMA were studied when the loading stress did not exceed the yield strength of PMMA at the corresponding temperature.The results show that with the temperature rising from 25℃to 115℃,the yield strength of PMMA decreases from 85.69 MPa to 9.89 MPa,with a decrease of 88%.The creep behavior of PMMA is the result of the coupling action of temperature and stress.Increasing the temperature or loading stress can greatly improve the creep rate of PMMA;and the creep process of PMMA can be effectively controlled at the first and two stages by reducing the creep temperature or loading stress.The creep curves of the first and two stages of PMMA were simulated by the creep model of generalized creep equation and effective time theory.And the fitting curve has a high coincidence with the experimental results.

关 键 词：有机玻璃 蠕变 蠕变阶段 有效时间理论 

分 类 号：V25[一般工业技术—材料科学与工程]