由于高能激光武器破坏目标的瞬时性、反应的复杂性以及测试成本高昂，使得通过实验评估激光武器的毁伤威力具有很大难度，因此，通过数值模拟的方法对其毁伤威力进行建模仿真可以有效评估其攻防性能。在计算温度场时考虑了相变情况下材料导热率的变化以及材料熔化时熔化潜热对温度场的影响，建立了相应的位移场、应力场数理模型并进行模拟。将多物理场模型整合到仿真系统中，对激光武器打击目标的过程进行了系统仿真，模拟出不同工况下高能激光武器对目标的毁伤效果。仿真结果表明，激光辐照Al材料3.01 s时，激光实时功率密度为0.930 8 W/cm2，材料外壁面温度达到600℃，内壁面温度为352.522℃，此时材料表面刚刚达到熔化，但其所受应力已使材料发生脆性断裂，材料已被破坏。
Abstract
Due to the instant destroying process, complexity of the reaction process and high cost of testing, it is very difficult to evaluate laser weapon damage power through experimental approach. Hence, the offensive-defensive performance can be effectively evaluated through numerical simulation of the destructive power. The current work considered the thermal conductivity variation and the melting latent heat when the material phase changed to modify the temperature field. In addition, the corresponding displacement field and stress field model were established and calculated. Finally, multiple physical field models were integrated into a simulation system and the attacking process of target by laser weapon was simulated. Moreover, the damage effect of target on different working conditions was also simulated. The simulation results show that when the laser irradiation of Al material is 3.01 s, the laser real-time power density is 0.930 8 W/cm2, the outer wall temperature of the Al material reaches 600℃, and the inner wall temperature is 352.522℃. At this time, the surface of the Al material is just melting, but its stress has made the material brittlely fractured.
关键词
毁伤 /
传热 /
仿真 /
多物理场 /
高能激光武器
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Key words
high-energy laser weapon /
simulation /
heat transfer /
attacking /
multiple physical fields
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基金
国家自然科学基金(51536001);国家自然科学基金创新研究群体(51421063)
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脚注
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