摘要
为提高航空玻璃双向拉伸质量和拉伸成功率,满足军用战机要求,对航空玻璃双向拉伸进行研究。基于黏弹性材料的热力耦合理论,利用时温等效性方程,以Prony级数形式模拟有机玻璃的黏弹特性。建立双向拉伸有限元模型,对有机玻璃双向拉伸中的加热、冷却过程进行温度场分析;将计算的温度场结果导入双向拉伸分析,根据仿真选取拉伸速度,得到9个夹具处的位移拉伸力曲线,并拟合出位移-拉伸力关系表达式;对拉伸后的有机玻璃进行冷却定型模拟,航空玻璃冷却产生的力达到拉伸力的约2倍,采用拉杆回缩的方式减小收缩力10000 N,防止玻璃破裂或设备损坏。研究结果表明,35 mm厚航空玻璃的双向拉伸试验结果与仿真结果一致,根据仿真结果优化拉伸工艺,提高了拉伸质量与成功率。
This study focuses on enhancing the quality and success rate of biaxial stretching for aviation glass to meet the stringent requirements of military fighter applications.Based on the thermal mechanical coupling theory of viscoelastic materials,the viscoelastic properties of plexiglass are simulated in the form of Prony series by using the principle of WLF time temperature equivalence.The finite element model of biaxial stretching is established,and the temperature field of heating and cooling process in biaxial stretching of plexiglass is analyzed.The calculated temperature field results are introduced into the biaxial stretch dynamic analysis.The displacement and stretch force curves are obtained for 9 fixtures,and the displacement stretch force relationship expression is fitted.The cooling shaping simulation of the stretched plexiglass is carried out.The force generated by the cooling of aviation glass is about twice the stretch force.The retraction of the pull rod is adopted to reduce the shrinkage force of 10000 N to prevent glass breakage or equipment damage.The biaxial stretch test results of 35 mm thick aviation glass are consistent with the simulation results.The stretch process is optimized according to the simulation results,and the tensile quality and success rate are improved.
作者
赵文辉
白士欢
高大勇
李晓巍
段振云
ZHAO Wenhui;BAI Shihuan;GAO Dayong;LI Xiaowei;DUAN Zhenyun(School of Mechanical,Shenyang University of Technology,Shenyang 110870,Liaoning,China;Jinxi Chemical Research Institute Co.,Ltd.,Huludao 125000,Liaoning,China)
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2023年第10期3187-3194,共8页
Acta Armamentarii
基金
国家自然科学基金项目(51975386)
辽宁省工业攻关及产业化指导计划项目(2019JH810100067)。
关键词
航空玻璃
黏弹性
双向拉伸
有限元仿真
aviation glass
viscoelasticity
biaxial stretch
finite element simulation
