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

Kang, Se-Hyung; Han, Dong-Woon; Kim, Ho-Kyung

doi:10.1016/j.jma.2019.11.006

Cited by 20 publications

(11 citation statements)

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“…One type is the combination used in the current experiments involving magnesium AZ31 alloy as the top plate and aluminum Al5052 alloy as the bottom plate (designated T.M-B.A). The other type is a combination of magnesium AZ31 alloy as the top plate and cold-rolled mild steel as the bottom plate (designated T.M-B.S) [9]. For the T.M-B.S specimens, the relationship between the stress intensity factor amplitude and the number of cycles is ∆K eq /2 = 18.3N −0.13 f [9].…”

Section: Discussionmentioning

confidence: 99%

“…This study determined A, B, and n for Johnson-Cook models for Al5052 and AZ31 through curve fitting. The stress-strain curve data for AZ31 and Al5052 alloys used in this analysis were sourced from the literature [9,26] in order to define the Johnson-cook deformation model. Table 2 summarizes the values of A, B, and n determined in this study.…”

Section: Spr Joining Analysismentioning

confidence: 99%

“…To evaluate the effect of residual stresses on the fatigue lifetimes of SPR joints, the fatigue strength was estimated while considering and not considering the residual The equivalent stress intensity factor is found to be the most appropriate parameter to correlate the fatigue lifetimes of the current Mg/Al SPR joints and Al/Al SPR joints [23,26] under various loading angles. In addition, the maximum principal stress was reported to be the most appropriate to correlate the fatigue lifetimes of the Mg/Steel SPR joints [9]. However, it is not currently clear why the equivalent stress intensity factor and maximum principal stress appropriately predict the fatigue lifetimes of the Mg/Al and Mg/Steel SPR joints under various loading angles, respectively.…”

Section: Effect Of Residual Stresses On the Fatigue Lifetimes Of Spr ...mentioning

confidence: 99%

“…Finally, the effects of residual stress on the fatigue strength were qua tively evaluated by comparing these fatigue strengths of the joints with and withou sideration of the residual stresses. Due to the increasing adoption of the SPR method, several studies have examined the static and fatigue strengths of SPR joints with various material plates [5][6][7][8][9][10]. Kawamura and Cheng proposed a method to predict the S-N curves of SPR joints with aluminum alloy plates using the stress intensity factor based on the RPG (re-tensile plastic zone generating) load [5].…”

Section: Introductionmentioning

confidence: 99%

“…In addition, locked plate failures and rivet failures were generated by fretting wear at the interface between the rivet shank and the locked plate. Kang et al investigated the static and fatigue strength levels of SPR joints of magnesium alloy and cold-rolled steel plates under various loading conditions using a cross-shaped type of specimen geometry [9]. They reported that the fatigue ratios at loading angles of 0 • , 45 • , and 90 • are 22%, 13%, and 9%, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Residual Stresses on the Fatigue Lifetimes of Self-Piercing Riveted Joints of AZ31 Mg Alloy and Al5052 Al Alloy Sheets

Lee

Kim

2021

Metals

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During the self-piercing riveting (SPR) process, residual stress develops due to the high plastic deformation of the sheet materials. In this study, the effect of the residual stress on the fatigue lifetime of SPR joints with dissimilar magnesium AZ31 alloy and aluminum Al5052 alloy sheets was evaluated. The residual stress distribution was derived through a simulation of the SPR process by the FEA (finite element analysis). The measured values by the X-ray diffraction technique confirmed that the validity of the simulation has a maximum error of 17.2% with the experimental results. The fatigue strength of the SPR joint was evaluated at various loading angles using tensile-shear and cross-shaped specimens. It was found that the compressive residual stresses of the joint reduce the stress amplitude by 13% at 106 cycles lifetime, resulting in extension of its lifetime to approximately 3.4 million cycles from 106 cycles lifetime. Finally, it was confirmed that the fatigue life of SPR joints was appropriately predicted within a factor of three using the relationship between the fatigue life and the equivalent stress intensity factor. The fatigue resistance of the magnesium AZ31 alloy on the upper sheet was found to govern fatigue lifetimes of SPR joints of dissimilar magnesium AZ31 alloy sheets.

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Section: Discussionmentioning

confidence: 99%

Section: Spr Joining Analysismentioning

confidence: 99%