摘要
本文从粘度的基本定义出发,导出了冲击波阵面上粘度系数、应变率和粘应力的一种唯象表达式。并以45~#钢和L Y-12铝材料实验测量的冲击波剖面为例,计算出在这些材料中冲击波阵面上的上述参量及平均粘度系数。所得结果与W.C.Moss和张若棋等给出的结果进行了比较和讨论。
The phenomenological expressions of viscous coefficient. strain rate and viscous stress on a shock wave front were derived by using the intial definition of viscousity in this paper. The experssions obtained are the equation (5), (14) ,(17).The average viscous coefficient and the max. value of viscous stress on the shock wave front are given also (Eq. 10. 18).The viscous coefficient and strain rate were calculated by using the experimental results for LY-12AI and 45 steel.,and the max. viscous stress at the same time was obtained.The calculated results show that the viscous coefficient and the strain rate changes very conspicuously at different points on the shock wave front. The average viscous coefficients are 124 Pa·s under 9 GPa and 60 Pa·s under 35GPa for LY-12Al. The results show over are similar to that using dislocation model given by Zhang Ruogi and steady wave model by J.R. Asay.In this paper, we also obtain the relation between ef and e (Eq. 9) which is the strain while the viscous stress reaches the max. value on the shock wave front.From the calculated results using the relation above. we also discover that there is approximately a linear relation between ef for some metals.e=Bef B is a const. B is equal to 0. 53 for LY-12Al. W-alloy and Cu. and also 0. 54 for Fe.
出处
《爆炸与冲击》
EI
CAS
CSCD
北大核心
1989年第1期61-67,共7页
Explosion and Shock Waves
关键词
冲击波
粘度系数
粘度
应变率
viscous coefficient, strain rate, viscous stress.
