Experimental study on the ultimate strength of box-type hull girders subjected to extreme cyclic bending moments

IF 5.5 2区工程技术 Q1 ENGINEERING, CIVIL

Ocean Engineering Pub Date : 2025-07-03 DOI:10.1016/j.oceaneng.2025.122044

Kang Hu , Fangji Zhang , Renjie Xu , Huwei Cui , Ping Yang

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引用次数: 0

Abstract

The purpose of this paper is to gain insight into the failure mechanism and ultimate strength behavior of ship hull girder subjected to cyclic bending moments. To this end, experimental study and numerical simulation were performed to investigate the ultimate strength behavior of ship hull girder under cyclic bending, and to analyze the attenuation law of ultimate strength considering the cumulative plasticity and crack propagation in the cracked hull girder. Firstly, a simplified box-type hull girder is selected as the research target and a set of test fixtures is innovatively designed for the ultimate strength assessment of box-type hull girders under bi-directional cyclic bending. Then, six test models including a cracked model are designed and fabricated to make clear the relationship between the ultimate bending moment and the constant/variable amplitude of curvature as well as the number of cycles; and the corresponding relation curves are drawn. Based on test data and simulation results, the rationality and accuracy of numerical simulation are validated by error analysis. Finally, a few new insights are revealed so as to provide a feasible solution for the numerical simulation and experimental investigation on the ultimate strength behavior of hull girder in rough sea conditions.

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极限循环弯矩作用下箱式船体梁极限强度试验研究

本文的目的是了解船体梁在循环弯矩作用下的破坏机理和极限强度特性。为此，通过试验研究和数值模拟，研究了循环弯曲作用下船体梁的极限强度行为，分析了考虑裂纹梁累积塑性和裂纹扩展的极限强度衰减规律。首先，选取一种简化箱式船体梁作为研究对象，创新设计了一套箱式船体梁双向循环弯曲极限强度评估试验夹具；然后，设计和制作了包括裂纹模型在内的6个试验模型，明确了极限弯矩与定/变曲率幅值以及循环次数的关系；并绘制了相应的关系曲线。基于试验数据和仿真结果，通过误差分析验证了数值模拟的合理性和准确性。最后，提出了一些新的见解，为恶劣海况下船体梁极限强度特性的数值模拟和实验研究提供了可行的解决方案。

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来源期刊

Ocean Engineering 工程技术-工程：大洋

CiteScore

7.30

自引率

34.00%

发文量

2379

审稿时长

8.1 months

期刊介绍： Ocean Engineering provides a medium for the publication of original research and development work in the field of ocean engineering. Ocean Engineering seeks papers in the following topics.