Effects of friction factors on flat bottom self-pierce riveting joints of AZ31 magnesium alloy

Han, Seungkyu; Tang, Xingrui; Gao, Yuan; Zeng, Qingliang

doi:10.1179/1432891715z.0000000002155

Cited by 8 publications

(7 citation statements)

References 6 publications

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“…Han et al [9] numerically studied the effects of friction coefficients on joint quality using a two-dimensional (2D) FE model of an SPR joint with a flat plate die. The results revealed that the friction coefficient between the blank-holder and top sheet (0.1~0.3) could affect the movements of sheets along the horizontal direction, while the friction coefficient between the rivet and sheets (0.1~0.3) had significant influences on the formation of I 1 and T min .…”

Section: Clampingmentioning

confidence: 99%

“…Variations in surface conditions will directly alter the friction coefficient at the contact interface and influence the magnitude of friction force [8]. As a result, the deformation behaviours of the rivet and sheets will be unavoidably affected [9], and the final joint quality will also be influenced, as shown in Figure 2 [10]. Some efforts have been made to experimentally investigate the effects of surface conditions on SPR joint quality.…”

Section: Introductionmentioning

confidence: 99%

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Experimental and Numerical Investigations on the Impact of Surface Conditions on Self-Piercing Riveted Joint Quality

Zhao

Han²,

Liu

et al. 2023

Coatings

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In this study, experimental and numerical investigations were carried out to achieve a comprehensive understanding of the impact of surface conditions on self-piercing riveting (SPR) joint quality. Oil lubrication and sandpaper grinding were employed in experimental tests to change surface conditions at rivet/top sheet, top/bottom sheets and bottom sheet/die interfaces. A finite element (FE) model for the SPR process was also adopted to numerically assess the impact of surface conditions. Variations in surface conditions were modelled by changing friction coefficients at contact interfaces. The results revealed that the friction coefficient between the rivet and top sheet (μ1) imposed significant influences on the interlock (I1) by affecting the deformation of the rivet shank and top sheet. The friction coefficient between the rivet and bottom sheet (μ2) showed a lower influence on the joint quality because of a smaller contact area and shorter interaction time. The friction coefficient between the top and bottom sheets (μ3) led to opposite changing trends of remaining bottom sheet thickness at the joint centre (tc) and under the rivet tip (ttip). The friction coefficient between the bottom sheet and die (μ4) demonstrated crucial influences on the remaining bottom sheet at the joint centre. The riveting force was significantly influenced throughout the whole riveting process by the μ1, but only affected at the end of the joining process by the other three friction coefficients.

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Section: Clampingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigations on the Impact of Surface Conditions on Self-Piercing Riveted Joint Quality

Zhao

Han²,

Liu

et al. 2023

Coatings

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“…Han et al [61] proposed a flat self-piercing riveting process; 2-mm-thick AZ31 magnesium alloy sheet at 225 °C was used to verify the feasibility of the process, and the DEFORM-2D software was used to investigate the effects of the friction coefficient between the components on the quality of the joint. The optimum friction coefficients were obtained by simulation results, respectively.…”

Section: Hybrid Self-piercing Rivetingmentioning

confidence: 99%

Review on joining processes of magnesium alloy sheets

Han

Wang

et al. 2021

Int J Adv Manuf Technol

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Magnesium alloy sheets have an increasing proportion of applications in automobiles due to their high specific strength. The usability of traditional welding processes and mechanical joining processes is restricted by the characteristic of magnesium alloy sheets. In order to improve the plasticity of magnesium alloy sheets and realize the reliable joining of magnesium alloy sheets with dissimilar sheets, researchers have conducted a lot of research. In this paper, the existing joining processes of friction stir spot welding, friction stir blind riveting, hybrid self-piercing riveting, and friction self-piercing riveting for magnesium alloy sheets are reviewed; the latest advances of joining process are introduced; and the principle, development, advantages, and shortcomings of each process for improving the plasticity of magnesium alloy sheets are systematically described. Several unaddressed issues in the joining of magnesium alloy sheets are identified. The hybrid of mechanical and solid-state joining processes will be a trend in future development.

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“…The Coulomb friction model was chosen to describe the interactions between the contacted surfaces. The friction coefficients between different surfaces have a significant influence on the deformation behaviour of the rivet and sheets [18]. For instance, the friction coefficient between the bottom sheet and the die could directly affect the final thickness distribution of the bottom sheet, while the friction coefficient between the top sheet and the rivet could directly influence the rivet shank flaring distance [19][20].…”

Section: Critical Thicknessmentioning

confidence: 99%