Experimental results in fretting fatigue with shot and laser peened Al 7075-T651 specimens

Vázquez, Jesús; Navarro, C.; Domı́nguez, J.

doi:10.1016/j.ijfatigue.2011.12.014

Cited by 75 publications

(38 citation statements)

References 24 publications

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“…These differences can mainly be attributed to the different methods (integral and Moore and Evans) used to consider the redistribution in the stresses produced by the removed material during the drilling (hole-drilling) or electropolishing processes (XRD). In any case, both methods produced maximum values and residual-stress distributions that were similar to those obtained in a previous study for the same material and test specimens, but slightly different shot-peening process parameters [16].…”

Section: Experiments Setupsupporting

confidence: 84%

“…In addition, the formation of cracks due to the severe deformation produced by the ball's bombardment during the treatment is noticeable. Even when these cracks clearly have a negative effect on fatigue behavior, previous works [16,37,38] showed that, in a fretting-fatigue situation, the beneficial effect produced by residual stress and cold working due to shot peening makes the detrimental influence of these cracks vanish. The residual-stress field produced on the test specimens by the above shot-peening treatment was measured by means of two different techniques: the hole-drilling and X-ray diffraction (XRD) methods.…”

Section: Experiments Setupmentioning

confidence: 96%

“…For the particular case of high strength aluminum alloys, the effect produced by shot peening on fatigue life has been demonstrated to be beneficial in many situations, such as plain fatigue [22,23], notch fatigue [24,25], and especially notable in fretting fatigue [16,26,27].…”

Section: Introductionmentioning

confidence: 99%

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Fretting-Fatigue Analysis of Shot-Peened Al 7075-T651 Test Specimens

Martín

Vázquez

Domı́nguez

2019

Metals

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Shot peening is a mechanical treatment that induces several changes in the material: surface roughness, increased hardness close to the surface, and, the most important, compressive residual stresses. This paper analyzes the effect of this treatment on alloy Al 7075-T651 in the case of fretting fatigue with cylindrical contact through the results of 114 fretting fatigue tests. There are three independent loads applied in this type of test: a constant normal load N, pressing the contact pad against the specimen; a cyclic bulk stress σ in the specimen; and a cyclic tangential load Q through the contact. Four specimens at each of 23 different combinations of these three parameters were tested—two specimens without any treatment and two treated with shot peening. The fatigue lives, contact surface, fracture surface, and residual stresses and hardness were studied. Improvement in fatigue life ranged from 3 to 22, depending on fatigue life. The relaxation of residual-stress distribution related to the number of applied cycles was also measured. Finally, another group of specimens treated with shot peening was polished and tested, obtaining similar lives as in the tests with specimens that were shot-peened but not polished.

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Section: Experiments Setupsupporting

confidence: 84%

Section: Experiments Setupmentioning

confidence: 96%

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Fretting-Fatigue Analysis of Shot-Peened Al 7075-T651 Test Specimens

Martín

Vázquez

Domı́nguez

2019

Metals

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“…Plenty studies have shown that the service life of the mechanical connection structures can be reduced by more than 30% or even as high as 80% due to the existence of fretting fatigue [2][3][4]. Many surface treatments, such as coating and shot peening, have been proved to be effective in improving the fretting fatigue lives by the improvement of the surface wear resistance [5][6][7][8]. Laser quenching is recognized as a clean and convenient surface treatment because of the high laser power densities, fast cooling rate and no need of cool medium, such as water or oil.…”

Section: Introductionmentioning

confidence: 99%

Study on the Effect of Laser Quenching on Fretting Fatigue Life

Zhang

Yang

Cui

et al. 2019

Metals

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Laser quenching hardening is one of the most used surface treated technologies. In order to study the effect of laser quenching on the fretting fatigue life, fretting fatigue experiments of TC11 (Ti-6.5Al-1.5Zr-3.5Mo-0.3Si) titanium alloy specimens with different surface conditions were carried out on a special hydraulic servo fatigue test system. The experimental results showed that laser quenching hardening has a good performance in increasing the fretting fatigue lives of the TC11 alloy. However, the effects of laser quenching on fretting fatigue are more obviously at low stress level than at high stress level, the fretting fatigue life was increased by 110.78% at low stress level and 17.56% at high stress level, respectively. Based on the critical plane approach, the traditional SWT (Smith–Watson–Topper) parameter was modified and used to describe the fretting fatigue life of the TC11 alloy after hardening by the consideration of the variations of the hardening layer’s elastic modulus. Compared with the experimental results, all the errors of the predicted results lied in the error band of two.

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“…In the former, the RSs are treated as mean biaxial stresses superimposed on the stress field produced by external loading, in the latter case, the RSs are included as R-ratio and crack closure effects. In the vast majority of cases, RSs are estimated through experimental measurements taken on flat unnotched coupons using laboratory incremental layer removal X-ray diffraction (XRD) [15,16], incremental blind hole drilling [17,18], synchrotron X-ray [19,20] or neutron diffraction [21].…”

Section: Introductionmentioning

confidence: 99%

High Spatial Resolution Evaluation of Residual Stresses in Shot Peened Specimens Containing Sharp and Blunt Notches by Micro-hole Drilling, Micro-slot Cutting and Micro-X-ray Diffraction Methods

et al. 2016

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The moderately high lateral RS gradients (on the order of tens of MPa/μm) near shot peened notches in conjunction with the shallow treatment depth (some hundreds of microns) limit the application of far-field and/or high resolution synchrotron diffraction residual stress measurement techniques. Recently proposed Focused Ion Beam -Scanning Elecron Microscope -Digital Image Correlation (FIB-SEM-DIC) based micro mechanical stress relaxation methods for the measurement of residual stress at the micron scale became suitable techniques for local evaluation of residual stresses and stress gradients in shot peened specimens. In this paper ultra-high resolution (~0.5-0.8 μm depth and 5-10 μm lateral resolution) mechanical relaxation stress measurements were used to evaluate the stress variation local to individual peening dimples in ceramic (60-120 μm diameter beads) shot peened Al-7075-T651 double notched samples having 0.15, 0.5 and 2.0 mm radii using Micro-Hole Drilling (μHD), Micro-Slot Cutting (μSC) and micro X-ray Diffraction (μXRD) methods. The micron-sized sampling volumes enabled the stress to be evaluated in individual impact craters (dimples) showing significant point-to-point variation (~+/−150 MPa) (with certain dimples even recording tensile stresses). After around 30 μm of layer removal the heavily deformed region had largely been removed and the stress profile became much more homogeneous. At this depth the μHD and μSC results were in good accord with those from μXRD measurements which sample over a much larger volume (~40 μm depth × 50 μm laterally) showing an in-plane compressive stress of around 150 MPa far from the notches with the residual stress rising to about 200 MPa at a blunt (2 mm) notch and 500 MPa for a sharp (0.15 mm) one. Further, these recorded variations of residual stresses were correlated with microstructural features, e.g. grains, networks of sub-surface cracks, intermetallics and highly deformed sub-surface regions, revealed by large volume Serial Sectioning Tomography using Plasma Xe + Focus Ion Beam -Scanning Electron Microscope (PFIB-SEM), EDS and EBSD maps. This allowed for the first time characterize large volume (100 × 66 × 30 μm 3 ) of shot peened regions with resolution of dozens of nanometers and correlate residual stress depth profiles with 3D microstructural features. Finally, in (Benedetti et al. 2016, Int. J. Fatigue) these RS measurements are used to reconstruct the RS field through finite element (FE) analyses.

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Experimental results in fretting fatigue with shot and laser peened Al 7075-T651 specimens

Cited by 75 publications

References 24 publications

Fretting-Fatigue Analysis of Shot-Peened Al 7075-T651 Test Specimens

Fretting-Fatigue Analysis of Shot-Peened Al 7075-T651 Test Specimens

Study on the Effect of Laser Quenching on Fretting Fatigue Life

High Spatial Resolution Evaluation of Residual Stresses in Shot Peened Specimens Containing Sharp and Blunt Notches by Micro-hole Drilling, Micro-slot Cutting and Micro-X-ray Diffraction Methods

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