铝制加筋结构入水冲击模型试验与仿真研究

Experimental and numerical study on water-entry impact of aluminum-plated structure

    摘要
  • 摘要:
    目的 旨在研究铝合金结构的入水砰击弹塑性响应问题。
    方法 根据实船底部结构设计一套铝制加筋板缩比模型，通过开展不同高度的结构水平入水砰击试验，分析铝制加筋结构在入水冲击过程中的砰击压力和结构弹塑性动力响应。采用基于任意拉格朗日−欧拉（ALE）算法的显式有限元技术对入水冲击试验模型进行数值模拟。
    结果 结果表明，平底加筋板砰击时也存在饱和冲量现象，其最终变形量与入水高度之间近似为线性关系，且砰击压力在结构表面具有较好的均匀分布特性。数值预测结果与试验测量结果吻合较好，
    结论 研究证明了ALE耦合算法对铝制加筋结构入水冲击问题研究的可行性。

     

    Abstract:
    Objective This paper aims to study the slamming-induced elasto-plastic response of aluminum structures.
    Methods In this paper, an aluminum scale model based on the hull structure of a real ship is designed, then drop tests of aluminum stiffened plates with a deadrise angle of 0° are conducted from different drop heights to investigate the slamming pressure and structural dynamic elastoplastic response.Finally, the slamming drop tests are validated by adopting explicit finite element technology based on the Arbitrary Lagrangian-Euler (ALE) algorithm.
    Results The test results show that the saturated impulse phenomenon exists, and the final deformation of the stiffened plate is approximately linearly related to the drop height. The slamming pressure acting on the plate can be regarded as uniformly distributed. The numerical predictions are in good agreement with the experimental results.
    Conclusion The study provides experimental data on the aluminum stiffened plate structure design for high-speed aluminum ships and underwater vehicles.

     

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