强激光辐照下双层壳体温度场和应力场的数值模拟  

Numerical Simulation on Temperature and Stress Fields of Two-layered Shell Irradiated by the Intensive Laser Beam

作　　者：雷勇军[1] 吴非[2] 

机构地区：[1]国防科技大学航天与材料工程学院,湖南长沙410073 [2]酒泉卫星发射中心,酒泉735000

出　　处：《国防科技大学学报》2011年第6期100-104,共5页Journal of National University of Defense Technology

基　　金：教育部新世纪优秀人才支持计划项目(NCET-080-0148);高等学校博士学科点专项科研基金资助项目(20069998002);国防科技大学科研计划项目(JC10-01-01)

摘　　要：强激光照射下结构的热力学响应是激光应用技术的重要问题。本文采用三维有限元分析模型,对双层圆柱壳在强激光辐照下的温度场、应力场和位移场进行了数值模拟与分析。分析时考虑了材料参数随温度的变化特性,主要探讨了不同光斑直径下双层壳温度场的变化趋势,研究了外层壳厚度、热膨胀系数、弹性模量和泊松比等参数对内层壳光斑中心处温升、应力和变形的影响规律。结论表明,激光光斑直径对内层壳的温度场分布有着重要影响,且内层壳温度分布和外层壳热传导系数相关;所有材料参数中,热膨胀系数对应力场分布的影响最大,厚度次之,弹性模量和泊松比影响最小。本文所得结论可为结构的激光破坏效应分析提供重要参考。The thermal dynamic response of structures irradiated by the intensive laser beam has been an important issue in the area of laser application.Adopting three-dimensional finite element model,numerical simulation and analysis were performed in order to make out the temperature,stress and displacement fields of two-layered cylindrical shell irradiated by intensive laser beam.In the study,the several parameters of materials corresponding to temperature were considered as variables.The influence on distribution of temperature field brought by various laser spot diameters was also studied.And the rules of temperature rise,stress and displacement of inner layer at the spot center were investigated,while the outer layer＇s thickness,expansion factor,the elastic modulus and the Poisson ratio were changing.It is shown that,the diameter of laser spot plays an important role in the temperature field distribution,keeping in touch with conductivities of outer layer;expansion factor is the dominant parameter affecting stress field,thickness is a lesser dominant one,and elastic modulus and Poisson ratio are the least.The conclusion can provide a substantial reference for the laser breakage analysis and anti-laser reinforcing technology.

关 键 词：激光辐照 双层壳体 温度场 热应力 有限元法 

分 类 号：TN246[电子电信—物理电子学]