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总览 评价 张瑞娟 , 赵隆茂 * ( 太原理工大学 应用力学与生物医学工程研究所; ) 摘要: 分离式Hopkinson压杆(SHPB)实验技术被广泛应用于脆性材料的动态压缩特性的实验研究,为了提高试件有效加载阶段的应力均匀性和保持一个近似恒应变率加载过程,通常应
张瑞娟, 赵隆茂*
(
太原理工大学 应用力学与生物医学工程研究所; )
摘要:
分离式Hopkinson压杆(SHPB)实验技术被广泛应用于脆性材料的动态压缩特性的实验研究,为了提高试件有效加载阶段的应力均匀性和保持一个近似恒应变率加载过程,通常应用脉冲整形辅助技术。本文采用数值模拟方法,研究了脉冲整形的优化参数。同时评价了在SHPB试验中脉冲整形技术对脆性试件的作用。研究发现:即使经过整形的入射脉冲产生一个近似恒应变率的反射脉冲,但在试件里,其不同位置的轴向应变变化趋势仍不相同。这表明: 在SHPB实验里,通过反射脉冲获得的“近似恒应变率”,可能并不是试件中“近似恒应变率”的表征。
关键词:
脆性材料;SHPB;数值模拟;脉冲整形器;恒应变率
Zhang Ruijuan, Zhao Longmao*
(
Institute of Applied Mechanics and Biomedical Engineering, Taiyuan University of Technology; )
Abstract:
Split Hopkinson pressure bar experimental technique has been frequently used to research dynamic compressed property of brittle materials where pulse shaping technique is employed to improve the stress uniformity and maintain a nearly constant strain-rate in the specimen during the effective loading period. Numerical simulations was employed to research optimal parameters of pulse shaper and the effect of the pulse shaping technique on the SHPB tests of brittle material in the paper . It is found that axial strain-rate in different place of specimens is different even though the shaped incident stress pulse generates a nearly constant strain-rate in the reflected pulse in the SHPB test. It implies that the achievement of a nearly constant strain-rate in the reflected pulse in the SHPB test may not be equivalent to a nearly constant strain-rate in the SHPB specimen.
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