【作者】 姚厚企； 剡小军； 庞跃钊； 鞠殿伟； 曲嘉；

【Author】 Yao Houqi;Yan Xiaojun;Pang Yuezhao;Jun Dianwei;Qu Jia;Harbin Engineering University College of Aerospace and Civil Engineering;

【机构】 哈尔滨工程大学航天与建筑工程学院；

【摘要】 基于二维弹塑性有限元模型,采用LS-DYNA有限元软件模拟系列不同长度子弹以不同速度撞击T2紫铜试样的分离式霍普金森压杆(SHPB)实验,得到了试样的应力-应变关系。与实验结果对比两者基本吻合,在系列子弹长度和冲击速度撞击下,模拟结果表明,试样的塑性变形程度与子弹长度正相关,试样上的应力随冲击速度的增加而增加。常温下紫铜在采用JC本构冲击压缩数值模拟仿真中,较准静态压缩表现出一定的应变率敏感性,但在动态冲击较高应变速率的范围内,发生相同变形时的应力水平基本一致,即T2紫铜在较高应变率区域内对应变率的变化不敏感。更多还原

【Abstract】 Based on the two-dimensional elastoplastic finite element model, the LS-DYNA finite element software was used to simulate the separate Hopkinson pressure bar(SHPB) experiment of different lengths of bullets striking T2 copper samples at different speeds. The stress-strain of the sample was obtained. relationship. Compared with the experimental results, the two models are basically consistent. Under the impact of series bullet length and impact velocity, the simulation results show that the plastic deformation degree of the specimen is positively correlated with the length of the bullet, and the stress on the specimen increases with the increase of the impact velocity. At room temperature, in the numerical simulation of JC constitutive impact compression at room temperature, the quasi-static compression shows a certain strain rate sensitivity, but in the range of high strain rate of dynamic impact, the stress level is the same when the same deformation occurs. That is, T2 copper is insensitive to changes in variability in the region of higher strain rate.更多还原