摘要
本文采用16节点立体等参元,进行了冲击速度为10～20m/s时的平板动力响应数值分析。程序中考虑了结构的大变形,采用全拉格朗日描述法,时间离散使用了纽马克法。文中分别对LY12CZ和PMMA两种材料平板的动力响应计算结果和试验结果作了比较。提出用Hopkinson Bar装置测定平板在硬撞击下撞击总耦合载荷及撞击点挠度随撞击时间的分布关系。同时文中提供了上述两种材料的动态力学性能参数,由这些参数可以认为PMMA为应变率敏感材料,在高速撞击下呈现“脆化”现象,而LY12CZ则为应变率不相关材料,在冲击载荷下呈现良好的塑性变形特性。
In this paper, the numerical analysis of dynamic response of the plate by cubic isoparametric elements of 16-nodes at 10~ 20 m / s impact rate is carried out. In the program the large deformation are considered by using Total Lagrange described method and time discreteness with Newmark method. A result of dynamic response calculation is compared with that of experiment for the plate of LY12CZ and PMMA respectively. A Hopkinson Bar device for measuring the coupling loads and deflection of impact points with impacting time is employed in this study. In the meantime, dynamic mechanical parameters of two materials mentioned above are provided, from which it shows that PMMA is a sensitive material to strain rate and appears brittleness' phenomenon, and LY12CZ is a material independent of strain rate and appears better plastic deformation behavior at impact loading.
出处
《航空学报》
EI
CAS
CSCD
北大核心
1992年第6期B258-B265,共8页
Acta Aeronautica et Astronautica Sinica
基金
航空科学基金
关键词
冲击载荷
霍普金森杆
应变速率
impact load, Hopkinson bar, strain rate, coupling load
