Ta-Hf-Nb-Zr体系高熵合金J-C模型及应用试验  

J-C model of high-entropy alloy Ta-Hf-Nb-Zr system and its application test

作　　者：李海峰 门建兵[1,2] 金文 刘旭东 LI Haifeng;MEN Jianbing;JIN Wen;LIU Xudong(State Key Laboratory of Explosion Science and Safety Protection,Beijing Institute of Technology,Beijing 100081,China;Tangshan Research Institute,Beijing Institute of Technology,Tangshan 063000,Hebei,China;School of Materials Science and Engineering,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]北京理工大学爆炸科学与安全防护全国重点实验室,北京100081 [2]北京理工大学唐山研究院,河北唐山063000 [3]北京理工大学材料学院,北京100081

出　　处：《爆炸与冲击》2025年第3期53-63,共11页Explosion and Shock Waves

基　　金：“叶企孙”科学基金(U2241234)。

摘　　要：针对包含高密度、高热值元素的高熵合金材料在聚能战斗部药型罩上的应用问题,选取Ta-Hf-Nb-Zr体系高熵合金为研究对象,采用INSTRON材料试验机、分离式霍普金森压杆试验平台,探寻该高熵合金在应变率为10^(-3)~10^(3)s^(-1)、温度为25~900℃以及应力三轴度为0.33~0.89条件下的力学响应规律,基于静动态力学性能试验结果,获取该合金的Johnson-Cook(J-C)本构方程参数及损伤失效模型参数,并建立爆炸加载下高熵合金爆炸成型弹丸(explosively formed projectile,EFP)数值模型。开展EFP成型脉冲X射线验证试验,结果显示:117μs时,高熵合金EFP成型较为完整,EFP长度为51.1 mm,直径为12.27 mm;187μs时,EFP尾部产生3处断裂,头部长度为24.3 mm,直径为12.27 mm,EFP速度为2496.3 m/s。模拟与试验的EFP长度、直径以及速度的误差均小于8.2%,模拟的断裂形态与试验结果基本一致,J-C模型有效预测了爆炸加载条件下高熵合金EFP的成型状态。In relation to the application of high-entropy alloy systems containing high-density and high-calorific value elements in the liner of shaped charge warheads,the Ta-Hf-Nb-Zr high-entropy alloy system is investigated.The study employed an INSTRON material testing machine and a split Hopkinson pressure bar testing platform to explore the mechanical response of this high-entropy alloy across a wide range of strain rates from 10^(-3) to 10^(3) s^(-1),temperatures ranging from 25 to 900℃,and stress triaxiality values ranging from 0.33 to 0.89.Yield strength and failure strain data were obtained from static round bar tensile tests and dynamic compression tests conducted under these varying conditions.By using least squares fitting,the parameters of the Johnson-Cook(J-C)constitutive equation as well as the damage failure model parameters,are derived.Subsequently,a simulation model for explosively formed projectile(EFP)made from high-entropy alloys under explosive loading conditions was developed.Pulse X-ray tests of the EFP formation were performed,and numerical simulations of the EFP formation process are conducted using LS-DYNA software.The results show that at 117μs,the high-entropy alloy EFP remains largely intact,with a length of 51.1 mm and a diameter of 12.27 mm.At 187μs,three fractures are observed at the tail of the EFP,with the head length measuring 24.3 mm,the diameter at 12.27 mm,and the EFP speed recorded at 2496.3 m/s.The numerical simulations demonstrate that the EFP length,diameter,and velocity at these time instants match the test data with errors of less than 8.2%.Moreover,the fracture patterns observed experimentally align closely with those predicted by the simulations.This consistency indicates that the J-C model effectively predicts the formation characteristics of high-entropy alloy EFPs under explosive loading conditions,confirming its utility in accurately simulating the EFP formation process.

关 键 词：高熵合金 Johnson-Cook模型 爆炸成型弹丸 脉冲X射线 

分 类 号：O389[理学—流体力学] TJ410.4[理学—力学]