Technical Brief

Effect of Rivet Hardness and Geometrical Features on Friction Self-Piercing Riveted Joint Quality

[+] Author and Article Information
Yunwu Ma, Ming Lou, Zhou Yang

Shanghai Key Laboratory of Digital
Manufacture for Thin-Walled Structures,
School of Mechanical Engineering,
Shanghai Jiao Tong University,
Shanghai 200240, China

Yongbing Li

Shanghai Key Laboratory of Digital
Manufacture for Thin-Walled Structures,
State Key Laboratory of Mechanical
System and Vibration,
School of Mechanical Engineering,
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: yongbinglee@sjtu.edu.cn

1Corresponding author.

Contributed by the Manufacturing Engineering Division of ASME for publication in the JOURNAL OF MANUFACTURING SCIENCE AND ENGINEERING. Manuscript received December 2, 2014; final manuscript received February 9, 2015; published online September 4, 2015. Assoc. Editor: Jingjing Li.

J. Manuf. Sci. Eng 137(5), 054501 (Sep 04, 2015) (4 pages) Paper No: MANU-14-1652; doi: 10.1115/1.4029822 History: Received December 02, 2014

Conventional magnesium alloys, due to their low ductility, have a poor self-piercing rivetability. Cracks always occur when the magnesium sheet is placed at the bottom layer, which brings great challenge to the use of the magnesium alloys. In this paper, friction self-piercing riveting (F-SPR) process was adopted to join 1 mm thick aluminum alloy AA6061-T6 to 2.2 mm thick magnesium alloy AZ31B, and the effect of rivet hardness and key geometrical features on joint formation were studied systematically. The experimental results showed that using rivets with a hardness of 190 HV, the top aluminum sheet could be well pierced and a larger rivet shank flaring value would be formed between rivet shank and the bottom magnesium. The effect of the rivet's geometrical features, including ribs under shoulder and inclination angle under shoulder, were examined using two evaluation criteria, i.e., rivet shank flaring value and remaining thickness, and found that the rivet with no ribs and 10 deg inclination angle under shoulder is suitable for joining 1 mm AA6061-T6 to 2.2 mm AZ31B in F-SPR process.

Copyright © 2015 by ASME
Topics: Rivets , Friction
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Fig. 6

Effect of rivet inclination angle. (a) and (a′) Drawing of rivet II and III, respectively; (b) and (b′) joints made using rivets II and III, respectively.

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Fig. 5

Effect of rivet ribs. (a) Geometry dimensions and (b) joint cross section.

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Fig. 4

Rivet geometrical features to be studied

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Fig. 3

F-SPR joints made with rivets at various hardness: (a) 330 HV, (b) 270 HV, (c) 190 HV, and (d) 140 HV

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Fig. 2

Schematic diagram and evaluation criteria of F-SPR joints

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Fig. 1

Commercial rivets and F-SPR setup used in this study. (a) Rivet photos; (b) rivet drawing; and (c) close-up view of the working platform.




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