加筋圆柱壳开孔围栏肘板拓扑优化设计

Topological optimization of opening fence brackets on ring-stiffened cylindrical shell

    摘要
  • 摘要:
      目的  在水下耐压圆柱壳结构开孔围栏与环向肋骨连接处，易出现应力集中。
      方法  为此，提出一种开孔围栏与环向肋骨连接肘板拓扑优化设计方法，以有效降低肘板区域的局部高应力。首先，采用子模型技术对连接肘板区域结构进行精细化应力分析；然后，以连接肘板为设计变量，考虑耐压壳板、围栏和肋骨特征点的应力约束，以肘板区域最大应力最小化为目标函数进行拓扑优化，并对拓扑优化结果进行工程化处理，得到最终的肘板形式。
      结果  计算结果表明，面板局部加宽的肘板形式可以有效降低应力集中程度；开孔围栏位置横向偏置时，远离中纵剖面一侧的肘板面板加宽长度较大；连接肘板与开孔围栏中心偏置时，肘板面板关于其腹板对称设计即可。
      结论  所做研究可为类似结构设计提供参考。

     

    Abstract:
      Objectives  Stress concentration is prone to take place at connections between the opening fence and ring ribs of a ring-stiffened cylindrical shell under external pressure.
      Methods  In this paper, a topological optimization method for the brackets that connect the fence to the ring ribs is proposed in order to effectively reduce the local high stress in the brackets. The sub-model technique is used to analyze the stress of the connecting brackets. In the design, the connection brackets are used as design variables and the stress of the shell, fence and ribs are used as constraints. The maximum stress of the bracket is minimized as the objective function. The topology optimization results are engineered to obtain the final form of the brackets.
      Results  The calculation results show that brackets of which the panel is partially widened can effectively reduce the stress concentration position of the opening fence transverse offset if the side of the bracket away from the longitudinal section is longer; the opening fence is offset relative to the brackets, and the symmetrical design of the brackets is feasible.
      Conclusions  This research provides a reference for similar structural design.

     

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