平面冲击波压缩下氧化铝陶瓷的动态强度

 简述了一维应变压缩条件下的材料动态强度表征，指出了静水压力和高应变率效应的强度影响。基于Drucker-Prager屈服准则，提出了Hugoniot弹性极限表征的修正形式。进行了氧化铝陶瓷平板撞击实验，采用VISAR测试了氧化铝陶瓷样品的自由面质点速度历程，讨论了氧化铝陶瓷动态压缩强度的测定和存在的问题，对实验现象进行了一定的探讨。结果表明，材料动态强度的表征与实验测定之间存在相当大的差距。

Dynamic Strength of Alumina under Plane Shock Waves

The strength expression of material under shock loading has been reviewed.The effects of the hydrostatic pressure and the high strain rate on the strength,has been discussed.A modified form for the Hugoniot elastic limits was given associated with the Drucker-Prager yield criterion.Free surface velocity histories were measured by VISAR in plate impact experiments on alumina with a light gas gun.The experimental determination of the dynamic strength of alumina was discussed and open problems were clarified.By comparing the strength expressions of ceramic materials with the experimental results,the differences were mentioned.Analysis and discussion were made for the experiment phenomenon.