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Failure analysis of bilge keels and its design improvement

机译：舱底龙骨的失效分析及其设计改进

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Several cracks were detected in the internal structure of the bilge keels used to enhance the transverse stability of ships, as well as on the connection of these to the hull and in some regions of the plating edges of the bilge keels. These cracks compromised the watertight integrity of the bilge keels and, in the long run, could also jeopardize the integrity of the hull. A failure analysis of the structural damages detected was carried out, in order to identify the causes of failure and to propose improvements that could avoid them. Several stress concentration regions were identified in the structure studied, which coincided with the critical areas where the structural failures were found. The influence of the internal reinforcements of the hull (stiffeners) in the increased levels of stress induced in the welded joints of the bilge keels to the hull was also assessed. Improved design geometry for the bilge keel internal structure was proposed, taking into account the longitudinal and transversal structural performance of the bilge keels.
机译：在舱底龙骨的内部结构中发现了一些裂缝，这些裂缝用于增强船舶的横向稳定性，以及在这些与船体的连接处以及舱底龙骨的镀覆边缘的某些区域。这些裂缝损害了舱底龙骨的水密完整性，从长远来看，还可能危及船体的完整性。对检测到的结构损坏进行了故障分析，以便确定故障原因并提出可以避免的方法。在研究的结构中确定了几个应力集中区域，这些区域与发现结构破坏的关键区域一致。还评估了船体内部加强筋（加劲肋）对舱底龙骨与船体的焊接接头所引起的应力增加的影响。考虑到舱底龙骨的纵向和横向结构性能，提出了改进的舱底龙骨内部结构的设计几何形状。

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