Fatigue behaviour of clinched joints in a steel sheet

Kim, J‐B.; Kim, H‐K.

doi:10.1111/ffe.12263

Cited by 15 publications

(5 citation statements)

References 8 publications

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“…Kim's experimental results indicated that both the coach-peel and four-point single-lap type specimens had low fatigue ratios, and the failure mode of the coach-peel specimens was a pull-off failure. Kim and Kim 22 used load amplitude life curves (Δ P = Nf ) as a simple method to calculate fatigue strength. They stated that the fatigue life of the specimen was controlled by many factors, including the load size, load type, and geometric shape of the specimen.…”

Section: Introductionmentioning

confidence: 99%

The fatigue fracture mechanism of Al7075 aluminum alloy clinching joints

Zhang

Yan

Peng

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part L:

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Lightweight aluminum alloys are widely used in automotive structural parts. Clinching (press-joining) is one of the most promising alternatives to welding for joining aluminum alloys, and as the failure of the joint is mainly caused by fatigue, the fatigue properties of the clinched joints directly affect the reliability and safety of the connected specimens. To gain a deeper understanding of this phenomenon, the static mechanical and fatigue properties of Al7075 aluminum alloy single-lap clinched joints were studied using static strength and tensile-tensile fatigue tests. The F–N curves of the joints were fitted using a straight-line and three-parameter power function method. The fractured samples and wear scars were analyzed by scanning electron microscopy and energy-dispersive spectroscopy. The results showed that the neck of the clinched joint and the upper sheet near the joint experienced the highest degree of fatigue fracture, the fretting wear debris consisted mainly of alumina and metallic aluminum, and the fretting wear was of a mode that differed from the two modes identified in the literature that we have dubbed “upper sheet inter-sheet region fretting wear.”

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Section: Introductionmentioning

confidence: 99%

The fatigue fracture mechanism of Al7075 aluminum alloy clinching joints

Zhang

Yan

Peng

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part L:

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“…cyclic loading) and subsequently to failure of the technical component. In the past there have been a number of investigations on fatigue behavior of clinched structures and on the identification of positions of cracks initiating during the clinching process [9,10,11]. However, further knowledge about the fatigue crack growth behavior of clinched structures is essential.…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Fracture Mechanical Investigations of Clinchable Sheet Metals Made of HCT590X

Weiß

Schramm

Kullmer

2021

KEM

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In many areas of product manufacturing constructions consist of individual components and metal sheets that are joined together to form complex structures. A simple and industrial common method for joining dissimilar and coated materials is clinching. During the joining process and due to the service load cracks can occur in the area of the joint, propagate due to cyclic loading and consequently lead to structural failure. For the prevention of these damage cases, first of all knowledge about the fracture mechanical material parameters regarding the original material state of the sheet metals used within the clinching process are essential.Within the scope of this paper experimental and numerical preliminary investigations regarding the fracture mechanical behavior of sheet metals used within the clinching process are presented. Due to the low thickness of 1.5 mm of the material sheets, the development of a new specimen is necessary to determine the crack growth rate curve including the fracture mechanical parameters like the threshold against crack growth ΔKI,th and the fracture toughness KIC of the base material HCT590X. For the experimental determination of the crack growth rate curve the numerical calculation of the geometry factor function as well as the calibration function of this special specimen are essential. After the experimental validation of the numerically determined calibration function, crack growth rate curves are determined for the stress ratios R = 0.1 and R = 0.3 to examine the mean stress sensitivity. In addition, the different rolling directions of 0° and 90° in relation to the initial crack are taken into account in order to investigate the influence of the anisotropy due to rolling.

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“…As the process induces large deformations, cracks potentially occur during the clinching of brittle aluminium alloys [3,9], which might have an effect on the structural integrity of the joint. Hence, the increased attention with respect so fracture and fatigue life of clinched joints [3,10,11]. To improve the formability during the clinch process, heat assisted clinching was proposed [9,12,13,14] in order to improve the ductility of the material during the clinching process.…”

Section: Introductionmentioning

confidence: 99%