内压载荷金属壳体激光效应的相似性模拟准则  

Simulation Criteria of Similarity for Pressurized Metal Shells Irradiated by Laser Beams

作　　者：刘峰[1,2] 张相华[1] 王玉恒[1] 韦成华[1,2] 丁升[1] 王立君[1,2] 

机构地区：[1]西北核技术研究所,西安710024 [2]西北核技术研究所激光与物质相互作用国家重点实验室,西安710024

出　　处：《现代应用物理》2013年第3期263-270,共8页Modern Applied Physics

基　　金：激光与物质相互作用国家重点实验室基金资助项目(SKLLIM1001-01)

摘　　要：为了将模拟结果应用于评价动态内压载荷壳体的激光辐照效应,采用理论分析方法研究了模拟中的相似性问题,给出了飞行动态环境的模拟相似性原则、激光参数的模拟相似性原则和试件大小的模拟相似性原则.对飞行环境效应的模拟,要考虑壳壁气动加热和氧化效应;对光斑半径的模拟,若满足／πkt＜r0≤0.5R条件,则壳壁最高温度近似与光斑半径无关,并且对爆裂破坏模式,光斑半径还要满足热裂纹失稳扩展条件;对壳体试件的模拟,采用近几何相似缩比(大小缩比而壁厚不变),缩比率在1/5～1时可以用非线性拟合表征损伤关系.Modeling similarity problems have been studied by theoretical analysis for evalua- ting laser radiation effects on pressurized shells.The similarity criteria for the simulations of flight environment,laser beam dimensions and specimen dimensions have been developed.In the simulation of flight environment effects,it should be considered that the shell tempera- ture will rise with aerodynamic heating and thermal oxidation.In the simulation of laser beam dimensions,the peak temperature will barely change if the spot size satisfies the condi-tion of √πkt<r0≤0.5R,and if shell burst is included,the condition of thermal crack desta- bilization should be satisfied as well.In the simulation of prototype shell with sub-scaled specimen,the non-geometrical similarity,which means changing the sub-scaling shell's size but keeping its thickness unchanged,can be used,because the damage correlations can be characterized by a non-linear fitting curve in the scale factor range of 1/5~1.

关 键 词：激光应用 相似性模拟准则 内压载荷柱壳 飞行环境 光斑尺寸 缩比试件 

分 类 号：TN249[电子电信—物理电子学] O343.6[理学—固体力学]