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Fracture mechanism of titanium sheet self-piercing riveted joints
Abstract This paper devotes to investigating fracture mechanism of titanium sheet self-piercing riveted joint. Static fracture, fatigue fracture mechanism and fretting behavior of the joints were systematically studied by a Scanning Electron Microscope. The distribution of fretting debris on a rivet surface was tested by an Energy Dispersive X-ray Detector. The results concluded that static fracture pattern of the joints was upper sheet separated with the lower sheet, rivet neck and the button existed a macroscopic crack. Main fatigue fracture pattern of the joints was upper sheet rupture, the crack initiated from the region close to a riveted hole. Fretting wear initiated from the upper sheet surface in width direction and propagated to upper sheet surface in length direction during a continuous fretting process. Fretting wear degree increased with decreasing fatigue load level. Fatigue fracture pattern of the joints was impacted directly by fretting wear severity of contact surfaces.
Highlights Fracture mechanism of self-piercing riveted (SPR) joints in titanium sheet materials was studied. Fatigue tests were performed to investigate the effects of fatigue load levels on the fretting behaviors and failure modes of the SPR titanium joints. The failure surfaces were examined by SEM and EDX to analyze the fracture mechanism of the SPR titanium joints.
Fracture mechanism of titanium sheet self-piercing riveted joints
Abstract This paper devotes to investigating fracture mechanism of titanium sheet self-piercing riveted joint. Static fracture, fatigue fracture mechanism and fretting behavior of the joints were systematically studied by a Scanning Electron Microscope. The distribution of fretting debris on a rivet surface was tested by an Energy Dispersive X-ray Detector. The results concluded that static fracture pattern of the joints was upper sheet separated with the lower sheet, rivet neck and the button existed a macroscopic crack. Main fatigue fracture pattern of the joints was upper sheet rupture, the crack initiated from the region close to a riveted hole. Fretting wear initiated from the upper sheet surface in width direction and propagated to upper sheet surface in length direction during a continuous fretting process. Fretting wear degree increased with decreasing fatigue load level. Fatigue fracture pattern of the joints was impacted directly by fretting wear severity of contact surfaces.
Highlights Fracture mechanism of self-piercing riveted (SPR) joints in titanium sheet materials was studied. Fatigue tests were performed to investigate the effects of fatigue load levels on the fretting behaviors and failure modes of the SPR titanium joints. The failure surfaces were examined by SEM and EDX to analyze the fracture mechanism of the SPR titanium joints.
Fracture mechanism of titanium sheet self-piercing riveted joints
Zhao, Lun (author) / He, Xiaocong (author) / Xing, Baoying (author) / Zhang, Xianlian (author) / Deng, Cong (author) / Liu, Yang (author)
Thin-Walled Structures ; 144
2019-08-11
Article (Journal)
Electronic Resource
English
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