Journal of Shanghai Jiao Tong University

Journal of Shanghai Jiaotong University >

2025 , Vol. 59 >Issue 4: 458 - 465

DOI: https://doi.org/10.16183/j.cnki.jsjtu.2023.307

Naval Architeture, Ocean and Civil Engineering

Fatigue Strength Analysis of Ship’s Welded Structures Based on Method of Notch Stress

  • ZHEN Chunbo ,
  • LIU Shihao ,
  • ZHANG Aifeng ,
  • XING Shizhu ,
  • ZHANG Runze
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  • 1. Naval Architecture and Ocean Engineering College, Dalian Maritime University, Dalian 116026, Liaoning, China
    2. Shanghai Aerospace Electronic Technology Institute, Shanghai 201109, China

Received date: 2023-07-07

  Revised date: 2023-08-31

  Accepted date: 2023-09-07

  Online published: 2023-09-18

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Abstract

To address the fatigue strength problem of ship structures, the notch stress method is applied to typical structural joints focusing on weld toe and weld root. First, the basic principles of notch stress method and the notch fatigue analysis process of ship structure are introduced. Then, six typical joint types are set up for the double bottom structure of a product oil tanker. The local notch stress analysis of the fatigue hot spot is conducted using the finite element sub-modeling technology, allowing the determination of the notch stress concentration factor at the weld toe and weld root. Finally, based on the harmonised common structural rules (HCSR), the fatigue load and load condition of the ship structure are calculated, and the fatigue analysis of six typical joint types is performed. The results show that under the same load conditions, the notch stress concentration factor at the weld toe of each hot spot is smaller than that at the weld root, and the joint type 3 has the lowest fatigue damage value among the joint types, which suggests this type can improve the fatigue resistance of the hull.

Key words： ship structure; fatigue strength; notch stress; sub-model method; harmonised common structural rules (HCSR)

Cite this article

ZHEN Chunbo , LIU Shihao , ZHANG Aifeng , XING Shizhu , ZHANG Runze . Fatigue Strength Analysis of Ship’s Welded Structures Based on Method of Notch Stress[J]. Journal of Shanghai Jiaotong University, 2025 , 59(4) : 458 -465 . DOI: 10.16183/j.cnki.jsjtu.2023.307

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