本文针对交变水压作用下典型环肋圆柱壳结构的疲劳裂纹扩展问题进行研究。首先，设计加工大厚度缩比试验模型，基于模型实测数据的静强度数值仿真结果，制定局部取样、预制裂纹方案；其次，通过开展压力筒静水外压强度试验及内外压差疲劳试验，获得结构应变及预制表面裂纹的扩展情况；最后，根据模型试验数据和经典公式，对肋骨角焊缝壳板预制纵向表面裂纹扩展情况进行预报。研究表明，水下耐压环肋圆柱壳结构虽然受力状态为压应力，在交变水压作用下同样存在疲劳问题。
In this paper, the fatigue crack propagation of typical ring-rib cylindrical shell structures under alternating water pressure is studied. First, a large thickness shrinkage test model is designed. Based on the static strength numerical simulation results of the measured data of the model, a local sampling and prefabrication crack scheme is developed. Secondly, the strain of the structure and crack propagation of the prefabricated surface were obtained by carrying out the hydrostatic external pressure strength test and the fatigue test of internal and external pressure difference. Finally, according to the model test data and the classical formula, the longitudinal surface crack propagation of the prefabricated rib fillet weld shell plate is predicted. The research shows that although the stress state is compressive stress, the fatigue problem also exists under alternating water pressure.
2025,47(11): 42-47 收稿日期：2024-8-21
DOI：10.3404/j.issn.1672-7649.2025.11.008
分类号：U674.941
基金项目：海装预研项目（K6350）
作者简介：谢晓忠(1988-),男,博士,高级工程师,研究方向为水下工程结构强度与稳定性
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