Low-cycle fatigue of dissimilar friction stir welded aluminum alloys

Rodriguez, R.I.; Jordon, J.B.; Allison, P. G.; Rushing, Timothy W.; Garcia, Lyan I.

doi:10.1016/j.msea.2015.11.075

Cited by 50 publications

(26 citation statements)

References 54 publications

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“…Metallographic experiments using optical microscopy and scanning electron microscope found that the weld cross-section could be divided into nugget zone (NZ), thermomechanically affected zone (TMAZ) and heat affected zone (HAZ) [21,22], as shown in Figure 2. Analysis of each zone revealed that the material in NZ region underwent dynamic recrystallization process and redistribution of the strengthening phase.…”

Section: Characteristics Of Weld Zonesmentioning

confidence: 99%

“…Specimens for fatigue test are usually sectioned and loaded perpendicular to the joint centerline [21][22][23][24][25][27][28][29][30][31]. Zhang [32] studied the fatigue fracture surface for a 6005 aluminum alloy FSW joint by Philips X130 SEM.…”

Section: Fractographymentioning

confidence: 99%

“…A summary of the fatigue parameters for Basquin-Coffin-Manson's equations is given in Table 2. Fatigue life was increased with greater welding speed, but was nearly not affected by the rotational rate [21,88,89]. In Feng's work [89] on fatigue behavior of the Al 7075 weld, the energy per cycle and fatigue life were determined, as shown in Table 3.…”

Section: The Strain Cycle (En) Analysismentioning

confidence: 99%

“…The estimated fatigue life parameters from Basquin-Coffin-Manson are provided in Table 2. Rodriguez [21] investigated low-cycle fatigue behavior of dissimilar FSW of AA6061-to-AA7050. The fatigue life for various tool rotational speeds was given in Figure 16.…”

Section: The Strain Cycle (En) Analysismentioning

confidence: 99%

See 3 more Smart Citations

Fatigue of Friction Stir Welded Aluminum Alloy Joints: A Review

Gao

2018

Applied Sciences

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The application fields of friction stir welding technology, such as aerospace and transportation, has high safety requirements and fatigue is the dominant failure mode for weldments. It is of great significance to understand the fatigue properties of friction stir welded joints. This paper provides an overview of the fatigue mechanism, influencing factors, crack growth rate, and fatigue life assessment. It is found that the fatigue performance of friction stir welded joints can be affected by welding process parameters, test environment, stress ratio, residual stress, and weld defect. The optimized process parameters can produce high quality weld and increase the weld fatigue life. Laser peening is an effective post weld treatment to decrease fatigue crack growth rate and improve material fatigue life.

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Section: Characteristics Of Weld Zonesmentioning

confidence: 99%

Section: Fractographymentioning

confidence: 99%

Section: The Strain Cycle (En) Analysismentioning

confidence: 99%

Section: The Strain Cycle (En) Analysismentioning

confidence: 99%

See 2 more Smart Citations

Fatigue of Friction Stir Welded Aluminum Alloy Joints: A Review

Gao

2018

Applied Sciences

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“…Especially for the nugget zone, it is more sensitive to the VHCF failure than other subzones. The fatigue behaviors of FSW joints, including the fatigue crack propagation [14,15], low cycle fatigue [16,17], and high cycle fatigue [18], have been experimentally studied in many previous works. It was found that the FSW process had a positive effect on the fatigue properties of the joints.…”

Section: Introductionmentioning

confidence: 99%

Very High Cycle Fatigue Crack Initiation Mechanism in Nugget Zone of AA 7075 Friction Stir Welded Joint

Kitamura

Yang³

et al. 2017

Advances in Materials Science and Engineering

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Very high cycle fatigue behavior of nugget zone in AA 7075 friction stir welded joint was experimentally investigated using ultrasonic fatigue testing system (20 kHz) to clarify the crack initiation mechanism. It was found that the fatigue strength of nugget zone decreased continuously even beyond 10 7 cycles with no traditional fatigue limits. Fatigue cracks initiated from the welding defects located at the bottom side of the friction stir weld. Moreover, a special semicircular zone could be characterized around the crack initiation site, of which the stress intensity factor approximately equaled the threshold of fatigue crack propagation rate. Finally, a simplified model was proposed to estimate the fatigue life by correlating the welding defect size and applied stress. The predicted results are in good agreement with the experimental results.

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