弹体斜撞击单层金属薄靶的数值仿真  

Numerical Study of the Oblique Perforation of Single Thin Metallic Plates

作　　者：郭子涛 郭钊 张伟[2] GUO Zitao;GUO Zhao;ZHANG Wei(Department of Civil Engineering,Jiujiang University,Jiujiang 332005,China;Hypervelocity Impact Research Center,Harbin Institute of Technology,Harbin 150080,China)

机构地区：[1]九江学院土木工程和城市建设学院,江西九江332005 [2]哈尔滨工业大学高速撞击动力学实验室,黑龙江哈尔滨150080

出　　处：《高压物理学报》2018年第4期113-123,共11页Chinese Journal of High Pressure Physics

基　　金：国家自然科学基金(11072072);江西省青年基金(20161BAB211001)

摘　　要：通过调用ABAQUS子程序引入修正的靶板J-C本构模型和修正的应力三轴度三分段式失效准则,开展了平头、卵形弹0°~60°斜撞击单层Q235钢薄靶的数值仿真计算,分析了弹体头部形状、撞击角度对靶板防护性能及失效模式的影响,同时对弹体击穿靶板后的角度偏转问题进行了分析,并提出了一个改进的角度偏转半理论模型。结果发现:平头弹在各个撞击角度下较卵形弹更容易击穿靶板;靶板的防护性能与弹体造成的靶板损伤及失效模式紧密相关,单层靶板在平头弹以同一角度分别低速和高速斜撞击后具有不同的失效模式,而在卵形弹斜撞击下失效模式相差不大;仿真与实验结果吻合较好。In this study,we conducted numerical simulations of the oblique perforation of single 1 mm-thick Q235 steel plates subjected to flat- and ogive-nosed projectiles at 0°-60° by invoking the ABAQUS subroutine to introduce a modified J-C constitutive model and a modified three-section failure criterion of stress triaxiality,and examined the effects of the projectile nose shape and the obliquity on the ballistic resistance and failure modes of the targets.We also investigated the angle-deflection of the projectiles perforating targets and proposed a modified semi-theoretical model to describe the angle-deflection laws.The results show that the target perforation by flat-nosed projectiles is easier than that by ogive-nosed projectiles at each oblique angles;the ballistic resistance of targets is closely related to the target damages induced by projectile impact;the target has different failure modes as impacted by flat-nosed projectiles at low and high velocities in the same oblique angle respectively,while the failure modes of single target due to impact of ogive-nosed projectiles at different angles do not show much difference.The results of numerical simulation agree well with those of experiments.

关 键 词：失效准则 斜撞击 防护性能 失效模式 角度偏转 数值仿真 

分 类 号：O347.3[理学—固体力学]