高速/超高速侵彻的尺度效应及相似规律

Scale effects and similarity laws on high/hypervelocity impact penetration

基于量纲理论建立了高速/超高速侵彻相似律的一般形式,研究了不同速度下撞击缩比试验与原型试验的尺度效应及起因,通过对国内外已有试验数据进行分析,揭示了尺度效应对高速/超高速侵彻的影响规律,认为材料的率相关性、破坏的发生和发展、热传导、转动和重力等因素影响了几何相似律的应用.其中,热传导与重力对侵彻过程的几何相似律影响较小.如果严格控制实验条件,在不改变弹靶材料的条件下,使应变率的影响、弹体破坏和转动不起主要作用,高速/超高速侵彻过程的几何相似律近似成立.

Based on dimension theory,a general form of penetration similarity is established.And the existing test data at home and abroad are analyzed.The influence law of penetration on the scale effects is revealed.It is considered that the strain-rate effect of materials,occurrence and evolution of damage,heat conduction,rotation,and gravity affect the geometric similarity laws.Among them,the effect of heat conduction and gravity on the geometric similarity law of the penetration process is less significant.If the experimental conditions are strictly controlled and the influence of strain rate,damage,and rotation of projectile materials is considered insignificant without changing the projectile materials and targets,the geometric similarity law of the high/hypervelocity penetration process can be approximately established.