论层裂强度(英文)

On Spall Strength

讨论了层裂强度的理论预估及经验确定.指出,平面冲击波致层裂试验的试件自由面速度或界面应力历史的实验最小值与损伤演化过程有关.数值模拟揭示,层裂面上的损伤演化严重影响层裂碎片中的波剖面传播.因此,平面层裂试验的“拉回”信号必须赋予新的解释。层裂强度的实验确定必须涉及层裂过程中的损伤演化.

Theoretical prediction and empirical determination of spall strength are discussed. It is noted that the experimental minimum of free surface velocity or interface stress history of a sample loaded by a plane shock wave is connected with the damage evolution process. It is revealed that the propagation of wave profile in the spall scab is affected seriously by the damage evolution on the spall plane. Therefore, it appears that a new interpretation of the origin of the pull-back signal in planar spall experiments is required and the instrumental determination of spall strength should be involved in the damage evolution in the spall process.