摘要
本文考虑单脉冲激光作用于金属靶引起的应力波单次反射导致层裂的阈值条件,包括激光通量与应力波强度的定标关系、应力波传播时的衰减、入射波与反射波相互作用以及不同层裂判据的比较。本文结果指出,对于一定的激光通量和靶板厚度,只有一定范围内的激光脉宽才能造成层裂,最低激光通量则对应于最佳激光脉宽。本文的方法和结论也适合于飞片撞击造成的层裂现象。
The threshold conditions for the spallation in metal targets irradiated by a pulsed laser beam, when the induced streso wave is firstly reflected from the target's rear free surface, is proposed in this paper. The scalling law for laser flux versus streso wave intensity, the laser induced streso wave attenuation, the incident -reflective streso wave interaction, and the comparison of several spallation criteria are also discussed. The results show that for the given laser flux and target thickness, the spallation is possible only for the laser pulse duration within a certain range and , furthermore, the lowest laser flux for spallation corresponds to the optimum laser pulse duration. The method and conclusions herein are basically applicable to the flyer-impact induced spallation.
出处
《强激光与粒子束》
EI
CAS
CSCD
1990年第3期345-352,共8页
High Power Laser and Particle Beams
关键词
激光
金属
靶板
层裂
阈值
断裂
laser-material interaction, dynamic fracture
