在船舶服役过程中船体结构经常会受到外部载荷因素产生裂纹，而降低船舶结构的承载能力。一直以来船舶研究者对含裂纹结构的强度研究都很重视。随着船舶设计理念的不断更新和船舶建造材料的突破，有关船舶上裂纹损伤的研究也越来越多。本文使用有限元分析方法以舱段结构为研究对象，考虑结构尺寸和裂纹特征的影响，开展含裂纹损伤的舱段剩余极限强度研究，获得了相关结论。根据得到的有限元结果，基于准牛顿法（BFGS）和通用全局优化法，提出了在弯曲、扭转荷载分别作用下考虑厚度影响的含裂纹损伤下的舱段结构剩余极限强度评估公式，为具有缺陷情况下的舰船用舱段结构剩余极限强度提供评估依据。
During hull service, the hull structure often suffers cracks due to external load, which reduces the ultimate strength of the ship structure. Researchers have always attached great importance to the strength of cracked structures. With the continuous renewal of ship design concepts and breakthroughs in shipbuilding materials, more and more research has been done on crack damage on ships. In this paper, the finite element analysis method is used to study the structure of the tank section. Considering the influence of the structure size and crack characteristics, the residual ultimate strength of the cabin with cracks is studied and relevant conclusions are obtained. Based on the obtained finite element results, with quasi-Newton method (BFGS) and general global optimization method, a formula for estimating the residual ultimate strength of cabin structures under crack under bending and torsional loads. It provides assessment basis for the remaining ultimate strength of the cabin structure with defects.
2019,41(2): 25-30 收稿日期：2018-03-26
DOI：10.3404/j.issn.1672-7649.2019.02.005
分类号：U663.8
基金项目：国家自然科学基金资助项目（51709134）；省自然科学基金资助项目（BK20160559）
作者简介：李晨鹏(1992-),男,硕士研究生,研究方向为船舶与海洋结构物结构强度、基于计算机的船舶结构优化
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