摘要
基于有限元法研究了典型10 m级直径贮箱箱底焊缝在双面对称补强、内表面补强及外表面补强三种情况下的内压承载性能。数值计算采用二维对称平面模型,考虑了筒段和短壳真实边界条件及焊缝对承载能力的影响,构建的考虑材料塑性的非线性数值分析模型准确地获得了贮箱箱底内外表面经向应力。结果表明:顶盖和瓜瓣焊缝区域是箱底的薄弱位置,使用内压下,双面对称补强的加强区内外表面经向应力差较小,结构均未进入塑性,单面补强的加强区内外表面经向应力差远大于双面对称补强,局部进入塑性,且外表面补强的加强区最大和最小经向应力差相对于内表面补强分别增加了9.7%和27.2%,变形不协调;设计内压下,箱底内外表面均有局部进入塑性,材料塑性对内外表面经向应力差有一定的缓解作用,能够显著缓解内外表面应力差造成的附加弯矩;双面对称补强优于内表面补强,内表面补强优于外表面补强,单面补强易产生附加弯矩,不利于箱底的均匀承载和变形协调。该研究结果指导了大直径贮箱箱底结构的优化设计。
Based on the finite element method,the influence of weld reinforcement methods(double symmetry reinforcement,inner surface reinforcement,outside surface reinforcement)on internal pressure bearing capacity of typical 10 m class diameter tank bottom was studied.The two-dimensional symmetric plane model was used for numerical calculation,and the effects of the real boundary conditions of the tube segment and the short shell and the weld on the bearing capacity were considered.The nonlinear numerical analysis model considering the plasticity of the material was constructed to accurately obtain the meridional stress on the inner and outer surfaces of tank bottom.Results showed that the weld area of the top and melon flap was a weak area of tank bottom.Under operating pressure,meridional stress difference between inner and outside surfaces of double symmetric reinforcement was smallest,and none of them presented plasticity.Meridional stress difference of single-side reinforcement was much larger than double symmetric reinforcement,and local plasticity occurred.Compared with inner surface reinforcement,the maximum and minimum meridional stress differences of outside surface reinforcement increased by 9.7%and 27.2%,and all of them led to uncoordinated deformation.Under design pressure,inner and outside surface meridional stress of tank bottom had local plasticity,and material plasticity had certain coordination effect on the inner and outside surface meridional stress difference,which can significantly alleviate the additional bending moment caused by the inner and outside surface stress difference.Double symmetric reinforcement was better than outside surface reinforcement,and inner surface reinforcement was better than outside surface reinforcement.The single-side reinforcement was easy to generate additional bending moment,which was not conducive to the uniform bearing and deformation coordination of tank bottom.The research results provide a guidance to the optimization design of the bottom structure of large diameter storage tank.
作者
胡正根
湛利华
董曼红
刘观日
李斌
常志龙
HU Zhenggen;ZHAN Lihua;DONG Manhong;LIU Guanri;Ll Bin;CHANG Zhilong(College of Mechanical and Electrical Engineering,Central South University,Changsha 410083,China;Beijing Aerospace Systems Engineering Research Institute,China Academy of Launch Vehicle Technology,China Aerospace Science and Technology Corporation,Beijing 100076,China)
出处
《航空动力学报》
EI
CAS
CSCD
北大核心
2020年第12期2681-2688,共8页
Journal of Aerospace Power
基金
国家重点基础研究发展计划(2017YFB0306300)
装备预先研究项目(305060509)。
关键词
焊缝补强
贮箱箱底
承载性能
内表面补强
外表面补强
双面对称补强
weld reinforcement
tank bottom
bearing performance
inner surface reinforcement
outside surface reinforcement
double symmetry reinforcement
