A microcrack evolution-based fatigue damage model for assessment of laser-arc hybrid welded joints in TC4 titanium alloy

IF 6.8 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue Pub Date : 2025-08-10 DOI:10.1016/j.ijfatigue.2025.109231

Shengbo Li , Qianli Liu , Haizhou Li , Wantong Wang , Rui Lu , Xingyi Ruan , Yaofu Wang , Yunfei Meng , Hui Chen

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引用次数: 0

Abstract

High cycle fatigue (HCF) failure in titanium alloy welded structures is predominantly caused by microcrack initiation and propagation induced by microscopic defects during fatigue loading. In this work, an idealized microcrack density-balanced evolution system was employed to characterize microcrack evolution during fatigue loading, and a fatigue damage evolution model was proposed to assess damage progression and predict the fatigue life of TC4 laser-arc hybrid welded joints. Microcrack number density was selected as the damage characterization parameter. A finite element model of the welded joint was developed in ABAQUS, and the fatigue damage evolution process was simulated through the implementation of a user material subroutine (UMAT). The cycle jumping technique was simultaneously employed to substantially decrease computational cost while preserving accuracy. This work adopted the aforementioned method to propose a HCF damage model for welded joints featuring parallel macro-microscale development. Fatigue experimental validation demonstrated good agreement between experimental data and simulation results, with the experimental fatigue life data predominantly lying within the twofold error band of the predicted values.

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基于微裂纹演化的TC4钛合金激光电弧复合焊接接头疲劳损伤评估模型

钛合金焊接结构的高周疲劳破坏主要是由疲劳加载过程中微观缺陷引起的微裂纹萌生和扩展引起的。采用理想微裂纹密度平衡演化系统表征疲劳加载过程中微裂纹演化特征，建立了TC4激光-电弧复合焊接接头疲劳损伤演化模型，用于损伤演化评估和疲劳寿命预测。选取微裂纹数密度作为损伤表征参数。在ABAQUS中建立了焊接接头的有限元模型，并通过用户材料子程序（UMAT）对焊接接头的疲劳损伤演化过程进行了仿真。同时采用循环跳跃技术，在保证精度的同时大大降低了计算成本。本文采用上述方法，提出了一种宏微观并行发展的焊接接头HCF损伤模型。疲劳试验验证表明，试验数据与仿真结果吻合较好，试验疲劳寿命数据主要处于预测值的两倍误差范围内。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Fatigue 工程技术-材料科学：综合

CiteScore

10.70

自引率

21.70%

发文量

619

审稿时长

58 days

期刊介绍： Typical subjects discussed in International Journal of Fatigue address: Novel fatigue testing and characterization methods (new kinds of fatigue tests, critical evaluation of existing methods, in situ measurement of fatigue degradation, non-contact field measurements) Multiaxial fatigue and complex loading effects of materials and structures, exploring state-of-the-art concepts in degradation under cyclic loading Fatigue in the very high cycle regime, including failure mode transitions from surface to subsurface, effects of surface treatment, processing, and loading conditions Modeling (including degradation processes and related driving forces, multiscale/multi-resolution methods, computational hierarchical and concurrent methods for coupled component and material responses, novel methods for notch root analysis, fracture mechanics, damage mechanics, crack growth kinetics, life prediction and durability, and prediction of stochastic fatigue behavior reflecting microstructure and service conditions) Models for early stages of fatigue crack formation and growth that explicitly consider microstructure and relevant materials science aspects Understanding the influence or manufacturing and processing route on fatigue degradation, and embedding this understanding in more predictive schemes for mitigation and design against fatigue Prognosis and damage state awareness (including sensors, monitoring, methodology, interactive control, accelerated methods, data interpretation) Applications of technologies associated with fatigue and their implications for structural integrity and reliability. This includes issues related to design, operation and maintenance, i.e., life cycle engineering Smart materials and structures that can sense and mitigate fatigue degradation Fatigue of devices and structures at small scales, including effects of process route and surfaces/interfaces.