Multiaxial fatigue model describing crack growth behavior and its application in welded structures of railway frames

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL International Journal of Fatigue Pub Date : 2025-01-20 DOI:10.1016/j.ijfatigue.2025.108831

Zhe Zhang, Bing Yang, Feng Feng, Shiqi Zhou, Long Yang, Shoune Xiao, Guangwu Yang

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引用次数: 0

Abstract

Welded joints are typically key regions for crack initiation and propagation, making it especially important to study their fatigue behavior under different loading conditions. This study extends the classic mode I Christopher-James-Patterson (CJP) model and proposes a multiaxial CJP model tailored for welded structures. The study incorporates parameters that drive and resist crack propagation, defining the equivalent stress intensity factor KCJP-eq for mixed-mode cracks. I + II mixed-mode fatigue crack growth experiments were conducted on as-welded and post-weld heat treatment specimens under different loading angles. Digital image correlation techniques were used to obtain displacement field data at the crack tip, and the improved multiaxial CJP model was applied to accurately calculate the crack propagation driving parameters. The results indicate that the improved multiaxial CJP model effectively accounts for residual stress effects, with the largest deviation in KCJP-eq due to residual stresses in the early stages of crack propagation being 10.89 %. Furthermore, for the as-welded specimens, the maximum error with the theoretical value occurs at a loading angle of 30°, reaching 2.89°.

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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.