Chinese Journal of Ship Research, Volume. 19, Issue 5, 107(2024)

Strength test of sandwich composite structure and fatigue life study of typical bolted joints

Gongrong LI1... Wei SHEN2, Yu QIU2, Jiajing LEI1 and Qijian HE1 |Show fewer author(s)
Author Affiliations
  • 1China Ship Development and Design Center, Wuhan 430064, China
  • 2School of Naval Architecture, Ocean and Energy Power Engineering, Wuhan University of Technology, Wuhan 430063, China
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    Objectives

    In the application of sandwich composite materials in ship structures, to ensure the structural strength characteristics, bolt connections are usually used between the sandwich composite structure and steel main hull. However, due to local stress concentration around the holes and the boundary effects at the connection locations, the bolt connection position is often becomes the most critical area of the structure, necessitating strength and fatigue assessments.

    Methods

    For a full-scale steel-sandwich composite panel structure, the strength characteristics of the plate frame under a 0.1 MPa uniform load are studied using experimental and finite element methods. The accuracy of the finite element method is then verified by comparing its results with those from the experimental method. Subsequently, based on the finite element method, fatigue tests for two equivalent bolted joints are designed through structural stress equivalence, and the fatigue life of the steel-sandwich composite structure is evaluated and verified.

    Results

    It is determined that the fatigue life of the panel structure under the design load meets the design requirement of 5 million cycles.

    Conclusions

    Regarding the fatigue problem of large bolted connections, equivalent joints can be designed for fatigue testing, and load equivalence can be achieved through structural stress equivalence.

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    Gongrong LI, Wei SHEN, Yu QIU, Jiajing LEI, Qijian HE. Strength test of sandwich composite structure and fatigue life study of typical bolted joints[J]. Chinese Journal of Ship Research, 2024, 19(5): 107

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    Paper Information

    Category: Ship Structure and Fittings

    Received: Jul. 4, 2023

    Accepted: --

    Published Online: Mar. 14, 2025

    The Author Email:

    DOI:10.19693/j.issn.1673-3185.03441

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