Fatigue life improvement by friction stir processing of 5083 aluminium alloy MIG butt welds

Borrego, L.P.; Costa, J.D.; Jesús, Joel De; Loureiro, A.; Ferreira, José Manuel Martins

doi:10.1016/j.tafmec.2014.02.002

Cited by 66 publications

(24 citation statements)

References 19 publications

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“…The best fitted linear region is selected to obtain slope and intercept of the curve. Stage I comprises fatigue threshold (Δ K th ) region where the FCG rate is considered zero, ie, 10 −10 m/cycle . Fatigue threshold value (∆ K th ) is evaluated by selecting the minimum value of abscissa and corresponding ordinate value of the best fitted curve.…”

Section: Fatigue and Fracture Testsmentioning

confidence: 99%

Investigation of fatigue and fracture behaviour of sensitized marine grade aluminium alloy AA 5754

Kumar

Singh

2019

Fatigue Fract Eng Mat Struct

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In the present study, fatigue and fracture characteristics of sensitized marine grade Al‐Mg (AA 5754) alloy are experimentally evaluated. Received alloy is sensitized at temperatures of 150°C (SENS50) and 175°C (SENS75) for 100 hours. Fracture parameters, KIc and JIc, are experimentally evaluated. Slow strain rate tensile tests at a crosshead speed of 0.004, 0.006, and 0.01 mm/min; fatigue crack growth tests at load ratios (R = Pmin/Pmax) of 0.1, 0.2, and 0.5; and low cycle fatigue tests at four strain amplitudes of (0.3‐0.6)% are performed for SENS50 and SENS75 alloys. Relatively lower magnitude of fracture toughness values are observed for SENS75 specimen. Severe degradation in tensile properties, fatigue crack growth characteristics, and low cycle fatigue lives are observed for SENS75 samples. Extended finite element method is adopted to simulate the elasto‐plastic crack growth during fracture toughness evaluation. Scanning electron microscopy (SEM) is used to understand the failure mechanism of sensitized alloys.

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Section: Fatigue and Fracture Testsmentioning

confidence: 99%

Investigation of fatigue and fracture behaviour of sensitized marine grade aluminium alloy AA 5754

Kumar

Singh

2019

Fatigue Fract Eng Mat Struct

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“…The FSW of AA5083 has been widely investigated to optimise welding parameters and achieve the maximum joint strength [24][25][26][27]. Reduced mechanical properties still occur in AA5083 FSWed joints because of high solute concentration; the associated strain hardening; and the serration-flow behaviour effect (Portevin-Le Chatelier effect [28]) occurring in the microstructure of FSWed joint, especially at the heat affected zone (HAZ).…”

Section: Introductionmentioning

confidence: 99%

Cold-Rolling Strain Hardening Effect on the Microstructure, Serration-Flow Behaviour and Dislocation Density of Friction Stir Welded AA5083

Sajuri

Selamat

Baghdadi

et al. 2020

Metals

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5083 aluminium (Al) alloy materials have extensive structural applications in transportation industries because of their high strength-to-weight ratio and corrosion resistance. However, under conventional fusion weldings, these materials are limited by their porosity, hot cracking, and distortion. Herein, friction stir welding (FSW) was performed to join a similar AA5083 alloy. A post-weld cold-rolling (PWCR) process was applied on joint samples at different thickness-reduction percentages (i.e., 10%, 20%, and 40%) to identify the effect of strain hardening on the microstructure and mechanical properties of the friction-stir-welded joint of AA5083 while considering the serration-flow behaviour at stress–strain curves and dislocation density of the post-weld cold-rolled (PWCRed) samples. FSW induced a 20% reduction in the tensile strength of the joint samples relative to the base metal. PWCR also reduced the average grain size at the nugget zone and base metal because of the increase in plastic deformation imposed on the samples. Furthermore, PWCR increased the dislocation density because of the interaction among dislocation stress fields. Consequently, the tensile strength of the friction-stir-welded joint increased with the increased cold-rolling percentage and peaked at 403 MPa for PWCRed–40%, which significantly improved the serration-flow behaviour of stress–strain and welding efficiency up to 123%.

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“…(1) Ax=axial cyclic loading; Be=cyclic bending; (2) Tσ=∆KI,90%/∆KI,10% for the N-SIF approach. (1) Ax=axial cyclic loading; Be=cyclic bending; (2) Tσ=∆KI,90%/∆KI,10% for the N-SIF approach. Table A1.…”

Section: Appendix A: Statistical Determination Of Fatigue Curvesmentioning

confidence: 99%

“…that strongly affect the fatigue strength of welded details [1][2][3]. Further, both weld seams and weld roots act as stress concentrators resulting in severe local stress/strain gradients.…”

Section: Introductionmentioning

confidence: 99%

On the accuracy of nominal, structural, and local stress based approaches in designing aluminium welded joints against fatigue

Zamzami

Susmel

2017

International Journal of Fatigue

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Fatigue life improvement by friction stir processing of 5083 aluminium alloy MIG butt welds

Cited by 66 publications

References 19 publications

Investigation of fatigue and fracture behaviour of sensitized marine grade aluminium alloy AA 5754

Investigation of fatigue and fracture behaviour of sensitized marine grade aluminium alloy AA 5754

Cold-Rolling Strain Hardening Effect on the Microstructure, Serration-Flow Behaviour and Dislocation Density of Friction Stir Welded AA5083

On the accuracy of nominal, structural, and local stress based approaches in designing aluminium welded joints against fatigue

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