考虑划伤缺陷和结构几何特征综合影响的TC4构件损伤力学疲劳寿命预测方法

IF 6.8 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue Pub Date : 2025-10-03 DOI:10.1016/j.ijfatigue.2025.109319

Xulong Chen , Weiping Hu , Yicun Zeng , Jian Li , Di Zhang , Zhixin Zhan , Qingchun Meng

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引用次数: 0

摘要

飞机结构部件在制造或服务过程中可能遭受表面划伤。本研究对具有划痕缺陷的TC4钛合金试样进行疲劳试验，研究划痕深度对疲劳寿命的影响。基于连续损伤力学和无划伤材料的疲劳损伤演化规律，建立了考虑表面划伤影响的等效疲劳损伤模型，避免了复杂的有限元模拟，大大减少了计算量。为了考虑划痕缺陷和局部几何特征的综合影响，该模型通过加入应力梯度效应和多轴等效应力进一步增强。对TC4钛合金开截面划伤管进行了多轴疲劳试验验证，预测结果与实验数据吻合较好。该方法可以根据无划痕部件的应力分析直接估计划痕部件的疲劳寿命，从而消除了对划痕周围复杂的局部应力场分析的需要，并在工程应用中展示了显著的优势。

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A damage mechanics-based fatigue life prediction method for TC4 components considering combined influence of scratch defects and structural geometric features

Aircraft structural components may suffer surface scratches during manufacturing or service. In this study, fatigue tests were conducted on TC4 titanium alloy specimens with scratch defects to investigate the influence of scratch depth on fatigue life. Based on continuum damage mechanics and the fatigue damage evolution law of scratch-free materials, an equivalent fatigue damage model was developed, which incorporates the effect of surface scratches while avoiding complex finite element simulations and significantly reducing computational effort. To account for the combined influence of scratch defects and local geometric features, the model was further enhanced by incorporating stress gradient effects and multiaxial equivalent stress. Multiaxial fatigue tests on open-section scratched TC4 titanium alloy tubes were conducted to validate the enhanced model, and the predicted results show good agreement with the experimental data. The methodology enables direct fatigue life estimation of scratched components based on stress analysis of scratch-free counterparts, eliminating the need for complex local stress field analysis around scratches and demonstrating significant advantages for engineering applications.

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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.