Notch structural stress theory: Part Ⅲ surface roughness effect on fatigue lives

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue Pub Date : 2025-03-17 DOI:10.1016/j.ijfatigue.2025.108938

Yifei Yu , Wenchun Jang , Bingying Wang , Fuxiao Hu , Hongge Li , Zhiqiang Ding

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Abstract

The dispersion of fatigue data is largely attributed to the effects of surface roughness, which are often overlooked in current structural fatigue assessment methodologies. This study examines the influence of surface roughness on the fatigue life of aluminum alloy notched specimens using our previously established Theory of Notch Structural Stress (TNSS). Results demonstrate a strong correlation between the IR describing the influence from structure factors and p_i related to fatigue life prediction, when the maximum valley depth of the surface profile is employed as an appropriate parameter. Consequently, TNSS enables accurate fatigue life predictions across varying notch geometries and surface roughness conditions.

While surface roughness is commonly regarded as having minimal impact on fatigue performance in the presence of sharp notches, the definition of notch sharpness remains ambiguous. In respect of this point, TNSS quantifies roughness sensitivity across different notch forms within a unified physical framework, providing a generalized understanding of roughness effects on fatigue lives without disregarding the crack initiation stage.

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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.