Comparison of structural design and future trends in composite hulls: A regulatory review

Han, Zhiqiang; Jang, Jaewon; Souppez, Jean-Baptiste R.G.; Seo, Hyoung-Seock; Oh, Daekyun

doi:10.1016/j.ijnaoe.2023.100558

Cited by 2 publications

(1 citation statement)

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“…The relevance of standardization with respect to composite material choice has been reviewed recentl. ISO 12215 has been revised after 2008, becoming less optimistic regarding the increase of tensile strength with respect to fiber volumetric fraction [26]. Composite structures in marine engineering are regulated by appropriate documents of classification societies, such as ISO 12215-5 [13] and DNVGL-RU-HSLC [27].…”

Section: Introductionmentioning

confidence: 99%

Structural Analysis of Deck Reinforcement on Composite Yacht for Crane Installation

Dragatogiannis,

Zaverdinos,

Galanis

2024

JMSE

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The crane installation on the deck of a yacht redistributes the stress field and affects the local structural integrity and performance. The safe operation of the yacht is associated with the optimal placement of the crane on the deck and the proper local structural reinforcement. Here, the structural analysis of the bow part of a yacht made of composite materials is studied, considering the retrofit installation of a crane, in three different cases of reinforcing the deck: (a) without any reinforcement, (b) with a T-type reinforcement, and finally, (c) with a longitudinal beam. The T-type connects the longitudinal bulkhead and the deck, reinforced locally with overlamination skin and adhesive-filler. The longitudinal beam works as a local longitudinal stiffener attached to the deck and connects the second, third, and fourth transverse frames. The structural analysis is performed using the finite element method following the classification societies’ rules. The local reinforcements are made from the same composite materials as the unreinforced deck. The maximum deformations, the principal stresses, and the safety factors following Tsai-Wu and Hashin criteria are calculated and compared for the three different cases. The T-type and longitudinal reinforcements reduce deck stresses by 33%, with longitudinal reinforcement reducing deck deformation by 17%. Composite failure analysis shows the structure was near failure, and the reinforcements enhance safety; T-type is better for multiaxial loads (Tsai-Wu), and longitudinal is superior for micromechanical failure (Hashin). By considering the structural performance and safety aspects, designers and engineers can make optimal decisions regarding yacht crane installation and proper reinforcement, leading to safer and more efficient structures.

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Section: Introductionmentioning

confidence: 99%