A novel method for improving fatigue life of friction stir spot welded joints using localized plasticity

Hassanifard, Soran; Mohammadpour, Masoud; Rashid, Hossein Ahmadi

doi:10.1016/j.matdes.2013.07.098

Cited by 29 publications

(15 citation statements)

References 21 publications

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“…Hassanifard et al [62] introduced a new method for enhancing the life and fatigue strength of friction stir spot weld in Al alloy 7075-T6. This method had two steps, in the first step, a keyhole in the middle of joints was transferred to open hole by means of drilling; in the second step, the open hole samples were allocated for cold expansion process in order to induce compressive residual stresses.…”

Section: Fatigue Strength Of Fssw Jointsmentioning

confidence: 99%

“…This method had two steps, in the first step, a keyhole in the middle of joints was transferred to open hole by means of drilling; in the second step, the open hole samples were allocated for cold expansion process in order to induce compressive residual stresses. The results showed that the cold expansion could enhance the fatigue life of joints without altering their failure modes [62].…”

Section: Fatigue Strength Of Fssw Jointsmentioning

confidence: 99%

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Friction Stir Spot Welding: A Review on Joint Macro- and Microstructure, Property, and Process Modelling

Yang

Tian

2014

Advances in Materials Science and Engineering

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Friction stir spot welding (FSSW) is a very useful variant of the conventional friction stir welding (FSW), which shows great potential to be a replacement of single-point joining processes like resistance spot welding and riveting. There have been many reports and some industrial applications about FSSW. Based on the open literatures, the process features and variants, macro- and microstructural characteristics, and mechanical properties of the resultant joints and numerical simulations of the FSSW process were summarized. In addition, some applications of FSSW in aerospace, aviation, and automobile industries were also reviewed. Finally, the current problems and issues that existed in FSSW were indicated.

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Section: Fatigue Strength Of Fssw Jointsmentioning

confidence: 99%

Section: Fatigue Strength Of Fssw Jointsmentioning

confidence: 99%

Friction Stir Spot Welding: A Review on Joint Macro- and Microstructure, Property, and Process Modelling

Yang

Tian

2014

Advances in Materials Science and Engineering

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“…A novel localized plasticity method, cold expansion, could improve the fatigue life of FSSW joints in all load ranges [ 34 ]. Hassanifard et al found that it could improve the fatigue life up to six times in high cycle regimes [ 35 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Loading Methods on the Fatigue Properties of Dissimilar Al/Steel Keyhole-Free FSSW Joints

Zhang

Zhao³

et al. 2020

Materials

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The energy evolution, fatigue life and failure behaviour of dissimilar Al/steel keyhole-free Friction stir spot welding (FSSW) joints were studied under different fatigue loads. The absorption energy of fatigue fracture, the fracture mechanism and the sensitivity of the fatigue limits to the fatigue load parameters were analysed. It was found that the stress ratio R determines the fatigue limit Ff, while the fatigue limit Ff is not sensitive to the loading frequency. The high-frequency fatigue load will increase the displacement deformation μ and fatigue fracture absorption energy Ea of the spot-welded joint, which are larger under asymmetric fatigue loading than those under symmetrical fatigue loading. At the same time, the symmetrical fatigue load can form the steady-state hysteresis loop, while asymmetric fatigue loading cannot, but asymmetric fatigue loading exhibits the displacement increment of fatigue softening. The fracture failure of spot-welded joints is a multiple crack source and the mixed-mode of ductile and brittle fracture mechanism, which exhibits typical fatigue striations in the fatigue fractures.

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“…Fatigue phenomenon is one of the main reasons for damage to many mechanical structures and can lead to sudden and catastrophic failure. Some research works on FSSW in the literature mainly focused on the estimated fatigue life of the welded specimens that are subjected to cyclic loading condition using stress-based 11 and strain-based [12][13][14][15] approaches for crack nucleation phase and using fracture mechanics approaches 16 for crack propagation phase. Consequently, a good correlation between predicted fatigue lives by aforementioned approaches and experimental data was reported.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of different strain-based damage criteria for predicting the fatigue life of friction stir spot-welded joints under multi-axial loading conditions

Aghabeigi

Hassanifard

Hashemi

2019

Proceedings of the Institution of Mechanical Engineers, Part L:

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In this article, fatigue life of dissimilar friction stir spot welds in Cross-Tension and Lap-Shear specimens is predicted using a number of fatigue damage criteria. The results revealed a relatively good correlation between predicted fatigue crack initiation lives and experimental data. Also, it has been shown that in the whole range of applied load levels, the least discrepancy between predicted fatigue lives and experimental data is related to the Smith–Watson–Topper criterion. Finally, an excellent agreement was found in predicting the location of the crack tips using the Fatemi–Socie criterion in both types of specimens.

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A novel method for improving fatigue life of friction stir spot welded joints using localized plasticity

Cited by 29 publications

References 21 publications

Friction Stir Spot Welding: A Review on Joint Macro- and Microstructure, Property, and Process Modelling

Friction Stir Spot Welding: A Review on Joint Macro- and Microstructure, Property, and Process Modelling

Effect of Loading Methods on the Fatigue Properties of Dissimilar Al/Steel Keyhole-Free FSSW Joints

Evaluation of different strain-based damage criteria for predicting the fatigue life of friction stir spot-welded joints under multi-axial loading conditions

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