Fatigue behavior of friction spot welds in lap shear specimens of AA5754 and Ti6Al4V alloys

Plaine, Athos Henrique; Suhuddin, U.F.H.; Alcântara, Nelson Guedes de; Santos, Jorge F. dos

doi:10.1016/j.ijfatigue.2016.06.005

Cited by 32 publications

(23 citation statements)

References 22 publications

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“…The fatigue‐life confidence assessment in refill FSSW is introduced by the 2‐parameter Weibull distribution, and the probability density function is given by Equation .

f ((), x) = \frac{β}{α} {(\frac{x}{α})}^{β - 1} e^{- {(\frac{x}{α})}^{β}} a ≫ 0, β ≫ 0

where α and β are the characteristic life and Weibull slope (shape parameter), respectively …”

Section: Methodsmentioning

confidence: 99%

“…In addition, it is possible to assess the Weibull mean life or mean time to failure (MTTF), which, in turn, provides the expected life for a given stress amplitude, Equation .

MTTF = α normalΓ ((), 1 + \frac{1}{β})

where Γ() is the gamma function …”

Section: Methodsmentioning

confidence: 99%

“…To obtain the fatigue life N f for several reliabilities, Equation was used.

N_{R_{x}} = α {(- ln R_{x})}^{- \frac{1}{β}}

where

N_{R_{x}}

is the value of fatigue life indicating X % of reliability …”

Section: Methodsmentioning

confidence: 99%

“…Although the authors successfully conducted a fatigue assessment by using the Weibull approach, details of crack propagation have not been investigated. Plaine et al analysed the fatigue life for dissimilar AA5754 and Ti6Al4V joints and presented S‐N curves for different reliability levels. The results showed considerable fatigue strength, and the authors attributed the good results to the absence of the hook geometrical feature.…”

Section: Introductionmentioning

confidence: 99%

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Fatigue assessment of refill friction stir spot weld in AA 2024‐T3 similar joints

Brzostek

Suhuddin

Santos

2017

Fatigue Fract Eng Mat Struct

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Refill friction stir spot welding is a solid‐state process technology that is suitable for welding lightweight materials in similar or dissimilar overlapped configuration. In this study, the fatigue behaviour of single overlapped spot joints of AA2024‐T3 was studied. To statistically analyse the fatigue data, a 2‐parameter Weibull distribution was deployed, considering several reliabilities (Re = 0.99, Re = 0.90, Re = 0.5, Re = 0.10). To obtain an optimized weld parameter according to the fatigue behaviour, 2 different weld conditions were studied, taking into account the effect of the hook formation. The microstructure analyses and microhardness profiles showed great similarity in both weld conditions. However, these conditions presented distinct interfacial hook profiles, in which the interfacial hook downward represented better fatigue life and infinite fatigue life at 15% of the maximum strength load. The fracture surfaces obtained from 3 different fracture modes were investigated by using scanning electron microscopy; the crack was tracked and described according to its fracture mechanisms from its initiation until the final failures. It was observed that the crack is initiated at hook profile.

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“…The fatigue‐life confidence assessment in refill FSSW is introduced by the 2‐parameter Weibull distribution, and the probability density function is given by Equation .

f ((), x) = \frac{β}{α} {(\frac{x}{α})}^{β - 1} e^{- {(\frac{x}{α})}^{β}} a ≫ 0, β ≫ 0

where α and β are the characteristic life and Weibull slope (shape parameter), respectively …”

Section: Methodsmentioning

confidence: 99%

“…In addition, it is possible to assess the Weibull mean life or mean time to failure (MTTF), which, in turn, provides the expected life for a given stress amplitude, Equation .

MTTF = α normalΓ ((), 1 + \frac{1}{β})

where Γ() is the gamma function …”

Section: Methodsmentioning

confidence: 99%

“…To obtain the fatigue life N f for several reliabilities, Equation was used.

N_{R_{x}} = α {(- ln R_{x})}^{- \frac{1}{β}}

where

N_{R_{x}}

is the value of fatigue life indicating X % of reliability …”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Fatigue assessment of refill friction stir spot weld in AA 2024‐T3 similar joints

Brzostek

Suhuddin

Santos

2017

Fatigue Fract Eng Mat Struct

Self Cite

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“…In the first category, the sleeve and the pin are above the sheet surface or below sheet surface and in the second category the pin is retracted within the sleeve or protrudes from it. The welding parameters such as time, rotational speed of the tool, displacement of the sleeve and the pin are the second important issue in designing the RFSSW process [15][16][17]. The movements of the sleeve and the pin are coupled together in such a way that the volume of the plunged portion of the sleeve corresponds to the volume of the space between the top surface of the upper sheet and the end face of the pin.…”

Section: Introductionmentioning

confidence: 99%

Selection of basic position in Refill Friction Stir Spot Welding of 2024-T3 and D16UTW aluminum alloy sheets

Lacki¹,

Derlatka²,

Gałaczyński³

2017

Archives of Metallurgy and Materials

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One of the important parameters of Refill Friction Stir Spot Welding is the so-called basic position of the tool. This is the arrangement of the pin and sleeve which occurs when the tool is plunged into the material. The basic positions can be divided into two categories. In the first category, the sleeve and the pin are above the sheet surface or below sheet surface and in the second category the pin is retracted within the sleeve or protrudes from it.The aim of the work was to test four settings of the basic position, and then determine the best setting of the basic position, without changing the other welding parameters. Joints made of an aluminum alloy 2024-T3 sheet having a thickness of 1.0 mm and an aluminum alloy D16UTW sheet having a thickness of 0.6 mm were analysed. The best setting of the basic position was determined based on assessment of the force carried in shear test, macrostructure and weld face of the joints.

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A method for manufacturing a mechanically strong and durable hybrid structure of polyethylene–hydroxyapatite composite and titanium alloy

Oliveira,

Morozo,

Fiori

et al. 2024

Polymer Engineering & Sci

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The integration of polymer, metal, and ceramic materials in hybrid structures represents a potential but underexplored alternative for biomedical applications. Here, we present a methodology for manufacturing a mechanically strong and durable hybrid overlap structure from a composite of green high‐density polyethylene (HDPE) and hydroxyapatite (HA) compatibilized with HDPE‐g‐MAH joined to a substrate of Ti6Al4V alloy. This process involves laser structuring of micro‐scale grooves on the metal surface, followed by injection overmolding of the polymer composite. A hybrid overlap joint with strong interfacial anchoring was achieved, resulting in outstanding joining strength and fatigue life. This achievement holds significant promise for future biomedical applications.Highlights Joining of composite of HDPE–HA with Ti6Al4V alloy via injection overmolding Laser texturing was effective in improving mechanical interlocking A hybrid joint with high shear strength and fatigue life was developed The hybrid joint is promising for biomedical applications

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Fatigue behavior of friction spot welds in lap shear specimens of AA5754 and Ti6Al4V alloys

Cited by 32 publications

References 22 publications

Fatigue assessment of refill friction stir spot weld in AA 2024‐T3 similar joints

Fatigue assessment of refill friction stir spot weld in AA 2024‐T3 similar joints

Selection of basic position in Refill Friction Stir Spot Welding of 2024-T3 and D16UTW aluminum alloy sheets

A method for manufacturing a mechanically strong and durable hybrid structure of polyethylene–hydroxyapatite composite and titanium alloy

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