基于结构应变参数的焊接结构高/低周疲劳行为统一分析方法

doi:10.3901/JME.2025.16.102

摘要/Abstract

摘要： 工程焊接结构服役条件日益严苛，导致其在服役周期内往往会承受高/低周疲劳载荷的共同作用。为统一分析高/低周疲劳载荷给焊接结构造成的疲劳损伤，对结构应力参数进行扩展，给出结构应变参数定义。针对工程应用中普遍存在的三种横向约束条件及三种弹塑性本构模型，提出根据截面合力及合力矩计算结构应变参数的具体方法。结构横向约束条件包括平面应力、平面应变和给定三维应力约束因子条件；弹塑性本构关系包括线性强化模型、Ramberg-Osgood硬化模型和自定义应力-应变曲线硬化模型。利用结构应变方法及主E-N曲线对872组不同母材焊接结构的高/低周疲劳数据进行分析。结果表明，等效结构应变参数可以统一分析不同母材焊接接头的高/低周疲劳数据。相对于等效结构应力参数，等效结构应变是用于评估焊接结构疲劳行为的更普适疲劳参数，可以统一分析不同母材、不同接头类型的焊接接头高/低周疲劳行为。

关键词: 高周疲劳, 低周疲劳, 焊接结构, 结构应变, 疲劳参数, 主E-N曲线

Abstract: Welded structures are experiencing increasingly stringent service conditions, enduring a mix of high- and low-cycle fatigue loads throughout their service life. A holistic approach to assess fatigue damage stemming from both load types is presented, expanding structural stress parameters to include the formulation of the structural strain parameter. A numerical technique is introduced, employing through-thickness resultant force and moment and accommodating three common structural lateral constraints： plane stress, plane strain, and predefined stress triaxiality factors. Simultaneously, three types of elastic-plastic hardening model are considered： linear hardening modulus, Ramberg-Osgood equation, and a customized stress-strain curve. Analysis of 872 sets of highand low-cycle fatigue data from welded structures with diverse base materials, utilizing the structural strain method alongside the master E-N curve, reveals the ability of equivalent structural strain parameters to correlate fatigue data across various materials. The equivalent structural strain parameter emerges as a universal fatigue metric, offering an effective foundation for comprehensive analyses on welded joint fatigue performance compared to the equivalent structural stress method.

Key words: low-cycle fatigue, high-cycle fatigue, welded structure, structural strain, fatigue parameter, master E-N curve

中图分类号:

TG406

雷林森, 李向伟, 邢世柱, 刘小超, 李永哲, 裴宪军. 基于结构应变参数的焊接结构高/低周疲劳行为统一分析方法[J]. 机械工程学报, 2025, 61(16): 102-115.

LEI Linsen, LI Xiangwei, XING Shizhu, LIU Xiaochao, LI Yongzhe, PEI Xianjun. Unified Analysis Method for High/Low Cycle Fatigue Behavior of Welded Structures Based on Structural Strain Parameters[J]. Journal of Mechanical Engineering, 2025, 61(16): 102-115.

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