Three-phase 2D model of long-rod penetrating semi-infinite metal targets considering variation in nose shape  

考虑弹头形状变化的长杆弹侵彻半无限金属靶的三阶段2D理论模型

作　　者：Yangcun Liu Yongjun Deng Xiaowei Chenn Yong Yao 刘洋村;邓勇军;陈小伟;姚勇(School of Civil Engineering and Architecture,Southwest University of Science and Technology,Mianyang 621010,China;Shock and Vibration of Engineering Materials and Structures Key Lab of Sichuan Province,Mianyang 621010,China;Advanced Research Institute of Multidisciplinary Science,Bejing Institute of Technology,Beijing 100081,China;The State Key Lab of Explosion Science and Technology,Bejing Institute of Technology,Beijing 100081,China)

机构地区：[1]School of Civil Engineering and Architecture,Southwest University of Science and Technology,Mianyang 621010,China [2]Shock and Vibration of Engineering Materials and Structures Key Lab of Sichuan Province,Mianyang 621010,China [3]Advanced Research Institute of Multidisciplinary Science,Bejing Institute of Technology,Beijing 100081,China [4]The State Key Lab of Explosion Science and Technology,Bejing Institute of Technology,Beijing 100081,China

出　　处：《Acta Mechanica Sinica》2022年第12期1-14,共14页力学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.11872118 and 12002293).

摘　　要：The nose shape effect on long-rod penetration was investigated by establishing numerical 2D models with different original nose shapes.The variations in nose shapes and the mass erosion rate of the rods in the transient phase,primary penetration phase,and secondary penetration phase were adequately analyzed by two dimensionless parameters,i.e.,the nose shape factor N* and the diameter ratio of the rod nose and shank n.In general,N*,η and the mass erosion rate of the rod vary distinctly in different phases,i.e.,unsteady in the initial transient and the secondary penetration phases,and quasi-steady in the primary penetration phase.Furthermore,a relationship between the mass erosion of the rod and the variation in the nose shape was established.A three-phase 2D model of long-rod penetration was further constructed by considering the variations in nose shape.This research may provide a reference to improve the theoretical model of long-rod penetration.本文借助数值模拟手段,通过建立不同初始弹头形状的长杆弹侵彻计算模型,分析了弹头形状对长杆弹高速侵彻的影响,结合头形因子和头杆径比两个无量纲参数,定量地描述了弹体头形在初始瞬态阶段、准定常侵彻阶段以及次级侵彻阶段的变化规律,分析了弹头质量在各阶段的侵蚀速率.研究表明:弹体头形因子、头杆径比及弹体质量侵蚀速率在不同阶段表现出明显的区别,即初始瞬态阶段及次级侵彻阶段为非定常变化、准定常侵彻阶段为定常变化;同时指出了弹体质量损失与弹体头形变化之间的联系,借助于各阶段的不同弹体头形因子和头杆径比,进一步建立了钨合金长杆弹高速侵彻钢靶的三阶段2D理论模型,研究结果可为长杆高速侵彻理论模型的完善提供参考.

关 键 词：Long-rod penetration Nose shape 2D model Initial transient phase Secondary penetration phase 

分 类 号：O35[理学—流体力学]