激光辐照充压壳体的破坏评价(Ⅰ)——破坏概率分析

Evaluation of pressurized cylindrical shell damage induced by high energy laser irradiation(Ⅰ)——Analysis of rupture probability

对激光辐照充压壳体破坏(失效)的结果进行评价时,对有关物理参量的不确定性进行定量分析是必要的。以充压壳体破坏(失效)的断裂机理为基础,讨论了如何建立壳体结构破坏(失效)的评价方法,问题的核心是建立壳体结构破坏(失效)的概率模型。该模型中,将影响结构破坏的各个物理参量划分为驱动力和抗力两种类型,通过计算驱动力和抗力的均值和标准差,可得到结构的破坏概率。在此基础上,给出了数值算例,得到了不同加载条件下模型壳体的破坏概率。

In the process of evaluating the pressurized cylindrical shell rupture effects induced by high energy laser irradiation, it is necessary to make a quantitative analysis of the uncertainties of physical parameters. Based on the rupture mechanism of the pressurized cylindrical shell subjected laser irradiation, the evaluation method was discussed and the mathematic model of rupture probability was proposed. The influence of physical parameters on structure is divided into two sorts i. e drive force and resist force in this model. The rupture probabilities could be gained from the mean and the standard deviation of resist force were calculation. And a calculation example of the rupture probabilities of the shell in different load conditions is provided.