摘要
针对目前数值仿真不能有效预测钽钨合金药型罩聚能装药杆式爆炸成型弹丸(Explosive formed projectile,EFP)的爆炸成型和断裂问题,开展了钽钨合金材料在不同应力、应变率以及温度条件下的力学性能实验,通过实验数据拟合得到了材料的Johnson-Cook失效模型参数。基于LS-DYNA嵌入该套模型参数开展了典型球缺钽钨药型罩EFP的成型仿真,通过同结构聚能装药静爆脉冲X射线摄影实验对仿真形成的EFP形状和速度计算结果进行对比验证。结果表明:将实测Johnson-Cook失效模型参数应用于杆式EFP成型的数值仿真时,各项成型参数的计算结果(形状、速度等)与实验结果的相对误差均小于9%,实现了对杆式EFP成型及断裂的准确预测。
Due to the limitation of current numerical simulation model in predicting the fracture of rodshaped tantalum-tungsten(Ta-W)alloy explosive formed projectile(EFP)during the forming process,the tests of the mechanical properties of Ta-W alloy specimen under different stress,strain rate and temperature conditions were carried out to obtain the parameters of Johnson-Cook failure model.The forming process of Ta-W EFP with typical charge structure was simulated by LS-DYNA software using the Johnson-Cook failure model and adaptive algorithm.X-ray experiment was carried out to verify the effectiveness of the numerical simulation.When the failure model was used in the numerical simulation of rod-shaped EFP molding,the prediction of EFP fracture was better,and the errors between the simulation results and the experiment results were less than 9%.The results revealed that the formation and fracture of rod-shaped EFP can be accurately predicted by the failure model.
作者
门建兵
卢易浩
蒋建伟
付恒
韩伟
MEN Jianbing;LU Yihao;JIANG Jianwei;FU Heng;HAN Wei(State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology,Beijing 100081,China;Unit 32381 of the Chinese People’s Liberation Army,Beijing 100072,China)
出处
《高压物理学报》
EI
CAS
CSCD
北大核心
2020年第6期134-141,共8页
Chinese Journal of High Pressure Physics
基金
国家自然科学基金(1187020967)。
