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为了在实验室设计激光辐照金属充压柱壳的损伤形态,对壳体损伤形态相关的靶面激光参数估计问题进行了研究。在忽略沿柱壳壁面热传导的条件下,给出了壳壁温度分布的解析表达式;根据随温度变化的材料力学参量和内压载荷,分析了壳体激光加热区内热裂纹的生成、稳定扩展和失稳扩展,推导出了壳体发生三种损伤形态的靶面激光参数估计表达式。针对30CrMnSi钢壳体进行了数值计算分析,数值结果与实验现象基本一致。研究结果表明,在给定目标特性条件下,充压柱壳激光辐照效应的损伤形态可以通过选择激光器参数来实验设计。
In order to design the damage morphology of laser-charged metal-filled cylindrical shell in the laboratory, the problem of estimating the laser parameters of the target surface related to the damage morphology of the shell was studied. The analytical expression of the shell wall temperature distribution is given under the condition of neglecting the heat conduction along the wall of the shell. According to the material mechanical parameters and the internal pressure load with the temperature change, the generation and stable expansion of the thermal crack in the laser heating zone are analyzed. And instability expansion, the expressions of the laser parameters of the target surface under three kinds of damage morphology are deduced. For 30CrMnSi steel shell numerical calculation and analysis, the numerical results and experimental phenomena are basically the same. The results show that under given target characteristics, the damage morphology of the laser beam irradiated by pressurized cylindrical shell can be experimentally designed by choosing the laser parameters.