Fatigue limits and crack growth thresholds in cyclic tension and bending of a stainless steel sheet

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue Pub Date : 2024-12-13 DOI:10.1016/j.ijfatigue.2024.108774

Gyoko Oh, Atsushi Umezawa

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引用次数: 0

Abstract

Many parts made of thin steel sheet are subjected to two types of loads: tension and bending. In this study, we define and suggestnovel fatigue failure criteria based on the outcomes of testing specimens with various notch lengths under these two loading modes at constant and different stress ratios. Large cyclic plastic strains occurred near the notch, which were taken into account in the evaluation of the threshold stress intensity range ΔKth. The fatigue limit under tension load was lower than that under plane bending load, and it had an inflection point on the relationship line with notch length. In mode I fracture, ΔKth became a constant value at the notch length corresponding to the boundary between short and long cracks, but no such inflection point was observed in mode IIII fracture. A calculation model for the critical stress intensity range ΔKthc, which is a constant value regardless of the length of the notch or crack, was presented. Using the strength factor to quantify the effect of stress ratio, the change in ΔKth was evaluated. A prediction model for the effective stress intensity range that takes into account the plasticity-induced crack closure effect was also presented.

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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.