强激光干扰下运动目标热损伤效应的有限元研究

为对空中飞行目标实施合理有效的强激光干扰,需要综合考虑采用的干扰方式、干扰效果以及考虑光斑偏移对干扰效果的影响。以热传导理论为基础,建立了激光辐照下移动目标温度场模型,采用伽辽金法建立了有限元分析模型,采用了等效比热容的方法处理材料的相变过程;并以Ansys软件为仿真平台,对目标在高斯分布的强激光作用下的温度场和热应力进行了综合仿真分析。结果表明,光斑与目标辐照区域的相对偏移对目标表面温度影响较大,对目标纵深破坏效应相对较小,应力变化主要发生在激光辐照区域,应力最大处也会随热源的移动而变化。

Finite element study on heat damage of moving target under the high energy laser irradiating

In order to carry out high energy laser irradiating effectively, the means of the interference, the influence of flare excursion and the effects of interference are considered synthetically. A model of moving target under laser irradiating based on heat conduction theory is established. An analyses model of finite element is established by taking Galerkin method. And the method of equivalent specific heat capacity is used to deal with the process of material phase changing. Besides, the simulation analysis is conducted towards the temperature distribute and heat stress of moving target under the Gaussian laser by using Ansys software as the simulation tool. The results show that, it has important influences on surface temperature of a moving target and has a little effect on depth damage relatively when the flare excursion exists. The heat stress changing mainly appears at the area of laser irradiating, and the location of max stress varies with the heat resource.