基于缺口应力法的船舶焊接结构疲劳强度分析  

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

作　　者：甄春博 刘世豪 张爱锋 邢世柱 张润泽 ZHEN Chunbo;LIU Shihao;ZHANG Aifeng;XING Shizhu;ZHANG Runze(Naval Architecture and Ocean Engineering College,Dalian Maritime University,Dalian 116026,Liaoning,China;Shanghai Aerospace Electronic Technology Institute,Shanghai 201109,China)

机构地区：[1]大连海事大学船舶与海洋工程学院,辽宁大连116026 [2]上海航天电子技术研究所,上海201109

出　　处：《上海交通大学学报》2025年第4期458-465,共8页Journal of Shanghai Jiaotong University

基　　金：国家重点研发计划重点专项(2016YFC0301500);中央高校基本科研业务费专项资金(3132023516)资助项目。

摘　　要：针对船舶结构疲劳强度问题,利用缺口应力法对典型结构节点的焊趾和焊根部位进行疲劳强度分析.首先,介绍缺口应力法和船舶结构缺口疲劳分析流程.然后,针对成品油船双层底结构设置6种典型节点型式,采用有限元子模型技术,进行疲劳热点部位的局部缺口应力分析,得到了焊趾和焊根部位的缺口应力集中系数.最后基于协调共同结构规范(HCSR)计算船舶结构疲劳载荷及工况,对6种典型节点型式进行疲劳分析.结果表明,相同工况下各热点部位焊趾处的缺口应力集中系数均小于焊根处,节点型式3具有较小的疲劳损伤值,该节点型式可提高船体的抗疲劳性能.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.

关 键 词：船舶结构 疲劳强度 缺口应力 子模型 协调共同结构规范 

分 类 号：U661.43[交通运输工程—船舶及航道工程]