【作者】 胡海波； 唐小军； 汤铁钢； 唐平； 庞勇；

【Author】 HU Hai-bo,TANG Xiao-jun,TANG Tie-gang,PANG Yong,TANG Ping (Laboratory for Shock Wave and Detonation Physics Research,IFP,CAEP,Mianyang 621900, China)

【机构】 中国工程物理研究院流体物理研究所冲击波和爆轰物理重点实验室；

【摘要】 介绍典型铁基材料冲击相变自由面速度和层裂信号VISAR测试结果,讨论由卸载稀疏冲击波引发的多次层裂现象与非相变断裂的差别;介绍柱壳构形爆炸断裂的不同断裂模式演化、特征应力分析和典型的单旋剪切断裂特征观测结果;介绍大尺度高速穿甲过程中的各类典型断裂模式和断口取向特征。针对各类断裂机制的实验现象分析,对动载高应变率变形和断裂模拟计算的本构方程、断裂判据、计算网格对断裂面发展的适应设计等进行讨论,并就实验观测和模拟计算的相互关系提出看法。更多还原

【Abstract】 Experimental profiles of free surface velocity and spall processes of impacted iron based alloys recorded by VISAR system are presented.Spall phenomena by rarefication shock wave(RSW) are discussed in comparison with normal tension spall without multi-morphological phase transition in tested metals. Dynamic fracture behaviors in explosively loaded metal shells are introduced.Special attention is paid to so-called self-organized shear fracture and possibility for numerical simulation of fracture evolution of this type.Fracture characteristics of large scale projectile penetration of tough targets are described with respect to fracture surface orientation for pluging penetration and penetration of cap and petals type.Based on analysis of experimental observation of fracture mechanisms and fracture behaviors,some questions in numerical simulation concerning constitutive equation considering shock phase transition and fracture modes and fracture thresholds of metals under different dimensional stress conditions,simulation cell dividing method better accommodated to fracture surface formation in 3D space are discussed.It seems that more attention should be paid to tight collaboration between numerical simulation efforts and experimental researches in fracture modeling validation and verification.更多还原