Study on the effects of hole diameter and sheet thickness on quasi-static and fatigue behaviors of pre-holed self-piercing riveted steel-aluminium joints

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL International Journal of Fatigue Pub Date : 2024-12-07 DOI:10.1016/j.ijfatigue.2024.108761

Chao Wang, Wanyuan Yu, Aiguo Cheng, Zhicheng He

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Abstract

This study aims to systematically investigate the effects of hole diameter and sheet thickness on the quasi-static and fatigue behaviors of PH-SPR joints of high-strength steel and aluminum alloy. Quasi-static shear and fatigue tests, full-field strain measurements, numerical simulations, and microscopic observations are conducted to analyze the mechanical properties, failure behavior, failure mechanism, and fatigue life. The results indicate that the undercut and bottom thickness decrease with an increase in hole diameter, while the top sheet thickness has a relatively small effect on the undercut and bottom thickness. The mechanical properties of PH-SPR joints decrease with an increase in hole diameter and increase with an increase in sheet thickness. The J16-5.5 joint exhibits the highest fatigue performance, the fatigue life of J16-5.5 joints is 5.3 times, 7.8 times, and 3.98 times higher than that of J12-5.5, J12-6.0, and J16-60 joints under a load level of 5.0 kN. This indicates that increasing the hole diameter reduces the fatigue life while increasing the sheet thickness can enhance the fatigue life. The localized stress concentration and fretting wear on the top and bottom sheets contribute to the fatigue fracture of both sheets.

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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.