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Chinese Journal of Mechanical Engineering 2021年第1期34卷 89-113页

作者： Hua Qian Ang School of Engineering RMIT UniversityBundooraVictoria 3083Australia

self-piercing riveting(SPR)is a cold forming technique used to fasten together two or more sheets of materials with a rivet without the need to predrill a *** application of SPR in the automotive sector has become increasingly popular mainly due to the growing use of lightweight materials in transportation ***,SPR joining of these advanced light materials remains a challenge as these materials often lack a good combination of high strength and ductility to resist the large plastic deformation induced by the SPR *** this paper,SPR joints of advanced materials and their corresponding failure mechanisms are discussed,aiming to provide the foundation for future improvement of SPR joint *** paper is divided into three major sections:1)joint failures focusing on joint defects originated from the SPR process and joint failure modes under different mechanical loading conditions,2)joint corrosion issues,and 3)joint optimisation via process parameters and advanced techniques.

关键词： self-piercing riveting Mechanical joining Joint defects Failure mechanisms Corrosion Joint optimisation

A Comparative Study of Friction self-piercing riveting and self-piercing riveting of Aluminum Alloy AA5182-O

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Engineering 2021年第12期7卷 1741-1750页

作者： Yunwu Ma He Shan Sizhe Niu Yongbing Li Zhongqin Lin Ninshu Ma Shanghai Key Laboratory of Digital Manufacture for Thin-Walled Structures School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Mechanical System and Vibration School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240China Joining and Welding Research Institute Osaka UniversityOsaka 567-0047Japan

In this paper,self-piercing riveting(SPR)and friction self-piercing riveting(F-SPR)processes were employed to join aluminum alloy AA5182-O *** studies were carried out to compare the two processes in terms of joint macrogeometry,tooling force,microhardness,quasi-static mechanical performance,and fatigue *** results indicate that the F-SPR process formed both rivet–sheet interlocking and sheet–sheet solid-state bonding,whereas the SPR process only contained rivet–sheet *** the same rivet flaring,the F-SPR process required 63%less tooling force than the SPR process because of the softening effect of frictional heat and the lower rivet hardness of *** decrease in the switch depth of the F-SPR resulted in more hardening of the aluminum alloy surrounding the *** higher hardness of aluminum and formation of solid-state bonding enhanced the F-SPR joint stiffness under lap-shear loading,which contributed to the higher quasi-static lap-shear strength and longer fatigue life compared to those of the SPR joints.

关键词： self-piercing riveting Friction self-piercing riveting Mechanical joining Quasi-static strength Fatigue

Prediction of Cross-Tension Strength of self-piercing Riveted Joints Using Finite Element Simulation and XGBoost Algorithm

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Chinese Journal of Mechanical Engineering 2021年第2期34卷 168-178页

作者： Jianping Lin Chengwei Qi Hailang Wan Junying Min Jiajie Chen Kai Zhang Li Zhang School of Mechanical Engineering Tongji UniversityShanghai 201804China Pan Asia Technical Automotive Center Shanghai 202106China

self-piercing riveting(SPR)has been widely used in automobile industry,and the strength prediction of SPR joints always attracts the attention of *** this work,a prediction method of the cross-tension strength of SPR joints was proposed on the basis of finite element(FE)simulation and extreme gradient boosting decision tree(XGBoost)*** FE model of SPR process was established to simulate the plastic deformations of rivet and substrate materials and verified in terms of cross-sectional dimensions of SPR *** residual mechanical field from SPR process simulation was imported into a 2D FE model for the cross-tension testing simulation of SPR joints,and cross-tension strengths from FE simulation show a good consistence with the experiment *** on the verified FE model,the mechanical properties and thickness of substrate materials were varied and then used for FE simulation to obtain cross-tension strengths of a number of SPR joints,which were used to train the regression model based on the XGBoost algorithm in order to achieve prediction for cross-tension strength of SPR *** show that the cross-tension strengths of SPR steel/aluminum joints could be successfully predicted by the XGBoost regression model with a respective error less than 7.6%compared to experimental values.

关键词： self-piercing riveting Joint strength Cross-tension Finite element modeling Machine learning

Fatigue strength evaluation of self-piercing riveted joints of AZ31 Mg alloy and cold-rolled steel sheets

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Journal of Magnesium and Alloys 2020年第1期8卷 241-251页

作者： Se-Hyung Kang Dong-Woon Han Ho-Kyung Kim Graduate School Seoul National University of Science and TechnologySeoul01811South Korea Department of Mechanical and Automotive Engineering Seoul National University of Science and TechnologySeoul01811 South Korea

The application of magnesium alloys to automobiles is increasing due to their superior specific strength and specific *** this study,an upper sheet of AZ31 magnesium alloy and a lower sheet of cold-rolled steel were joined by self-piercing riveting(SPR),a method commonly used to join automotive panels.A cross-shaped specimen was fabricated with a punching force of 35 kN,which exhibited the best joint strength for the SPR joint specimen *** and fatigue strengths were evaluated using cross-shaped specimens at loading angles of 0°,45°,and 90°.The load amplitude corresponding to the fatigue endurance limit was assumed to be at 106 cycles,and the fatigue ratios(=fatigue endurance limit/static strength)at the loading angles of 0°,45°,and 90°are 22%,13%,and 9%,*** all three loading angle specimens,fatigue cracks initiated at the triple point where the rivet shank,the upper sheet and the lower sheet are in contact with each other,with the cracks propagating through the thickness of the upper sheet and ultimately leading to *** fatigue lifetimes were evaluated through the von-Mises stress,maximum principal stress,and equivalent stress intensity *** was found that the fatigue lifetimes could be evaluated most appropriately through the maximum principal stress.

关键词： self-piercing riveting Magnesium alloy Fatigue strength Maximum principal stress Fatigue lifetime

Impact of Stack Orientation on self-piercing Riveted and Friction self-piercing Riveted Aluminum Alloy and Magnesium Alloy Joints

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Automotive Innovation 2020年第3期3卷 242-249页

作者： Yunwu Ma Sizhe Niu He Shan Yongbing Li Ninshu Ma Shanghai Key Laboratory of Digital Manufacture for Thin-walled Structures School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghaiChina State Key Laboratory of Mechanical System and Vibration School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghaiChina Joining and Welding Research Institute Osaka UniversityOsakaJapan

self-piercing riveting(SPR)is a mature method to join dissimilar materials in vehicle body *** self-piercing riveting(F-SPR)is a newly developed technology for joining low-ductility materials by combining SPR and friction stir spot welding *** this paper,the SPR and F-SPR were employed to join AA6061-T6 aluminum alloy and AZ31B magnesium *** two processes were studied in parallel to investigate the effects of stack orientation on riveting force,macro-geomet-rical features,hardness distributions,and mechanical performance of the *** results indicate that both processes exhibit a better overall joint quality by riveting from AZ31B to *** cracking in the Mg sheet is produced when riveting from AA6061-T6 to AZ31B in the case of SPR,and the cracking is inhibited with the thermal softening effect by friction heat in the case of *** F-SPR process requires approximately one-third of the riveting forces of the SPR process but exhibits a maximum of 45.4%and 59.1%higher tensile-shear strength for the stack orientation with AZ31B on top of AA6061-T6 and the opposite direction,respectively,than those of the SPR *** stack orientation of riveting from AZ31B to AA6061-T6 renders better cross-section quality and higher tensile-shear strength and is recommended for both processes.

关键词： self-piercing riveting Friction self-piercing riveting Aluminum alloy Magnesium alloy Stack orientation