摘要
激光引起的冲击波可能使得靶材料层裂断裂，这个现象取决于光束的功率密度、脉冲持续时间、靶的厚度和靶材料的性能参数。用气炮驱动的平板撞击实验和概念模拟分析了极短持续时间的三角形压缩应力击波在ＬＹ－１２铝靶中的传播衰减和层裂强度的时间相关性，根据气炮模拟实验结果，估计了厚度小于２ｍｍ的ＬＹ－１２铝靶产生层裂所需的激光功率密度和能量密度的阈值条件。
The occurrence of spall in target caused by laser-driven shock wave depends on thepower density of the beam,the induced pressure pulse duration,the target thickness and the targetmaterial parameters.The propagation attenuation of a triangular compressive wave and the time-dependence of spallation are discussed in this paper.Based on the gas-gun experimental simulationtechnique,an incident laser with power density of 10￣(11)W/cm￣2 and energy density of 10￣3J/cm￣2was proposed as the threshold for causing spallation in LY-12 Al target with a thickness of 2mm.
出处
《高压物理学报》
CAS
CSCD
北大核心
1994年第3期205-212,共8页
Chinese Journal of High Pressure Physics
基金
国家高技术863计划激光技术领域的资助
关键词
应力波
断裂
激光
层裂
propagation and attenuation of a stress wave,dynamic fracture,laser inducedshock.
