带球封头的钛合金耐压结构深海碰撞动屈曲研究

Deep sea collision dynamic buckling of titanium alloy pressure-resistant structure with ball head

钛合金深海装备在水下作业时可能会与海山、礁石等海底固定物发生碰撞,这种在高应力状态下发生的冲击碰撞可能会对钛合金结构稳定性造成很大的影响。目前,学术界对于这种在双重载荷环境下发生的结构稳定性问题并没有太多的研究,也没有可供参考的经验公式。在钛合金材料动态力学性能试验的基础上,结合理论分析和大量数值模拟,建立在碰撞力集中载荷和均布压力共同作用下钛合金球柱组合结构的动屈曲判断准则,所得结果可以为深海装备水下航行安全性提供重要参考。

Titanium alloy deep-sea equipment may collide with seafloor fixed objects of seamounts and reefs during underwater operations,and such impact collisions under high stress conditions may have a significant impact on the stability of titanium alloy structures.At present,there is not much study on this problem of structural stability under dual load environments,and there are no empirical formulas available for reference.Here,on the basis of dynamic mechanical performance tests of titanium alloy materials,combining theoretical analysis and a large number of numerical simulations,a dynamic buckling judgment criterion for titanium alloy ball-column composite structures under combined action of collision force concentrated load and uniformly distributed pressure was established.It was shown that the obtained results can provide important references for underwater navigation safety of deep-sea equipment.