球形弹丸超高速碰撞破碎特性  

Fragmentation properties of spherical projectiles impacting at hypervelocity

作　　者：汪庆桃[1] 吴克刚[1] 李必红[1] 陈志阳[1] 

机构地区：[1]国防科技大学指挥军官基础教育学院,长沙410073

出　　处：《振动与冲击》2014年第22期46-50,共5页Journal of Vibration and Shock

基　　金：国家部委基金资助项目(404030203)

摘　　要：讨论超高速碰撞数值模拟方法,用ANSYS/AUTODYN程序的SPH方法对球形弹丸超高速撞击时弹丸破碎、碎片云形成过程进行数值模拟并与实验结果比较,验证计算方法及模型参数的正确性。在此基础上研究钨合金、轧制均质装甲(Rolled Homogeneous Armor,RHA)两种材料球形弹丸破碎的临界速度随比值(ts/dp,ts为靶板厚,dp为弹丸直径)的变化规律,给出两种材料超高速碰撞时应变率及平均碎片尺寸随撞击速度的变化曲线以及碎片质量分布规律。The numerical simulation method for the process of hypervelocity impact was discussed.The damage mechanism and the process of debris cloud forming were studied with the SPH method in ANSYS /AUTODYN code when spherical projectiles at hypervelocity impact a thin shield.The hypervelocity impact of projectiles made of tungsten alloy and RHA（Rolled Homogeneous Armor）material with the given constitutive models was numerically simulated and the results are in good agreement with the experimental results.The fragmentation-initiation threshold velocity of the projectile,the average fragment size and the distribution of fragment size,together with their variation with the change of impacting velocity were investigated.

关 键 词：超高速碰撞SPH方法 破碎临界速度 尺寸分布规律 

分 类 号：V414.9[航空宇航科学与技术—航空宇航推进理论与工程]