潜器在航行时有可能与礁石、冰山、其他潜器等发生碰撞事故，碰撞会导致潜器部分结构出现受损、变形、发生屈曲等情况。近年以来，耐压结构在碰撞下的动力屈曲问题引来众多学者的关注与研究。本文利用有限元软件Ansys/Ls-dyna对钛合金耐压壳在碰撞下的动力屈曲展开研究，分析撞击速度对耐压壳动力屈曲的影响。结果表明：在撞击速度达到使耐压壳发生屈曲前，碰撞过程中的最大碰撞力与平均碰撞力的比值可能不变；在不考虑其他因素（耐压壳的厚度，弹性模量，静水压力等）对碰撞力影响的前提下，撞击速度在达到使耐压壳发生动力屈曲前，与最大碰撞力和平均碰撞力近乎呈线性关系。
When the submersible is sailing, it may collide with reefs, icebergs, other submersibles, etc. The collision will cause damage, deformation, and buckling of some submersible structures. In recent years, the dynamic buckling of pressure-resistant structures under collision has attracted the attention and research of many scholars. In this paper, the finite element software Ansys/Ls-dyna is used to study the dynamic buckling of a titanium alloy pressure shell under collision. The result of impact velocity on the dynamic buckling of the pressure shell shows that the ratio of the maximum collision force to the average collision force during the collision may be unchanged before the impact velocity reaches the buckling of the pressure shell；The impact speed is almost linearly related to the maximum collision force and the average collision force before the impact velocity reaches the buckling of the pressure shell，Without considering the influence of other factors (thickness of the pressure shell, elastic modulus, hydrostatic pressure, etc.) on the collision force.
2021,43(12): 55-58 收稿日期：2020-07-03
DOI：10.3404/j.issn.1672-7649.2021.12.010
分类号：U668
作者简介：王林(1963-),男,博士,教授,主要从事结构冲击与结构优化设计方面的教学和研究工作
参考文献：
[1] PAN B B, CUI W C. A comparison of different rules for the spherical pressure hull of deep manned submersible[J]. Journal of Ship Mechanics, 2011, 15(3): 276–85
[2] 马永前. 超椭球体壳在均匀压力作用下的屈曲问题研究[D]. 上海：同济大学, 2009.
[3] 罗凯, 刘铖, 田强, 等. 薄膜结构的后屈曲分析[C]//可展开空间结构学术会议. 2014.
[4] ZHANG J, WANG M, CUI W, et al. Effect of thickness on the buckling strength of egg-shaped pressure hulls[J]. Ships & Offshore Structures, 2017: 1–10
[5] DONNELL L, WAN C C. Effect of imperfections on buckling of thin cylinders and columns under axial compression[J]. Journal of Applied Mechanice-Teanics-Transactions of the ASME, 1950, 17(1): 73–83
[6] CASTRO S G P, ZIMMERMANN R, ARBELO M A, et al. Geometric imperfections and lower-bound methods used to calculate knock-down factors for axially compressed composite cylindrical shells[J]. Thin-Walled Structures, 2014, 74(1): 118–132
[7] CHRISTIAN H, RAIMUND R, JAN T. A new approach for robust design of composite cylindrical shells under axial compression[J]. 2005, 581: 141.
[8] BŁACHUT J, JAISWAL O R. On the choice of initial geometric imperfections in externally pressurized shells[J]. Journal of Pressure Vessel Technology, 1999, 121(1): 71–76
[9] BŁACHUT J. Locally flattened or dented domes under external pressure[J]. Thin-Walled Structures, 2015, 97: 44–52
