Evaluating the influence of residual stresses and surface damage on fatigue life of nickel superalloys

Fleury, R.M.N.; Nowell, D.

doi:10.1016/j.ijfatigue.2017.08.015

Cited by 39 publications

(19 citation statements)

References 19 publications

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“…They explained that the CRS at the surface layer could inhibit the crack initiation and propagation. Fleury et al [14] evaluated the influence of residual stress in a longitudinal direction on the fatigue life of machined nickel-based superalloy. They found that higher fatigue life could be obtained due to the presence of CRS.…”

Section: Introductionmentioning

confidence: 99%

Effects of Machining Induced Residual Shear and Normal Stresses on Fatigue Life and Stress Intensity Factor of Inconel 718

Hua

Wang

2019

Applied Sciences

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Residual shear stresses and normal stresses induced by machining affect the fatigue performance of components. Thus, residual shear and normal stresses should be considered simultaneously when evaluating the influence of residual stress on fatigue performance. In the present paper, the influences of residual shear and normal stresses on the fatigue life and stress intensity factor (SIF) of turned Inconel 718 were investigated. Firstly, the cos α measurement method was utilized to calculate the residual shear stress and residual normal stress of turned Inconel 718. Then, the combined effects of residual shear and normal stresses on fatigue life were evaluated through uniaxial tension–tension fatigue tests. Thirdly, a prediction model for the SIF was proposed by taking the residual shear and normal stresses into account. Finally, the predicted SIF was validated by the published experimental data from the literature. The predicted results of the proposed model generally agreed well with the available experimental data.

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Section: Introductionmentioning

confidence: 99%

Effects of Machining Induced Residual Shear and Normal Stresses on Fatigue Life and Stress Intensity Factor of Inconel 718

Hua

Wang

2019

Applied Sciences

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“…The argument for the use of quasi-static models is that the velocities in these events are relatively low and, particularly in the case of Nickel superalloys, the material is not very strain rate sensitive. Nevertheless, following the work presented in [6,11], a dynamic model was used here to better compare the numerical results of the impact of hard objects with the experimental damage simulation measurements. The model has been previously validated in [6] by firstly comparing the geometry of the dent with the experimental measurements of the damage geometry.…”

Section: Explicit Finite Element Modelmentioning

confidence: 99%

“…The residual stresses generated during the impact were validated by comparing the FE results with the residual stresses measured by X-ray diffraction (XRD). A second paper examines the propagation of a crack under the dent and in the presence of the residual stress field [11]. A dislocation density approach [12,13] is used to obtain the stress intensity factors of a crack propagating under the dent.…”

Section: Introductionmentioning

confidence: 99%

“…A short crack propagation law first introduced by Oakley and Nowell [14] was used in the analysis and the difference in fatigue life for parts with different dent depths highlighted. One important conclusion in [11] was that residual stress relaxation mechanisms need to be taken into account in order to accurately predict the fatigue life of damaged specimens.…”

Section: Introductionmentioning

confidence: 99%

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The effect of surface damage and residual stresses on the fatigue life of nickel superalloys at high temperature

Fleury

Salvati

Nowell

et al. 2019

International Journal of Fatigue

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A methodology for evaluating the effect of surface damage in the fatigue life of nickel superalloys is presented in this paper. Dents generated due to low velocity impacts of hard objects were simulated using a finite element (FE) model. The residual stress distribution underneath the dent root obtained numerically was compared with the measurements on experimentally simulated damaged specimens using ring-core milling at the micron scale through a combined Focused-Ion Beam and Digital Image Correlation technique (FIB-DIC). The numerical and experimental results for the residual stress show good agreement in terms of residual stress trends and magnitudes. The residual stress distribution obtained via the FE model was subsequently used in a fatigue short crack growth model for an estimation of the fatigue life of dented specimens. The fatigue life predictions were then compared with experimental fatigue results for the nickel superalloy at high temperatures. The comparison shows a significant improvement in the prediction of fatigue life of parts with superficial damage due to careful consideration of the residual stresses around the damage.

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“…Laser peening also has been used to recover fatigue life in FOD‐damaged samples . The stress fields surrounding FOD damage in titanium and nickel base superalloys have been studied . Laser peening prior to FOD impact is reported to reduce tensile residual stresses caused by FOD deformation by about 30% with concomitant benefits to fatigue life.…”

Section: Introductionmentioning

confidence: 99%

Recovery of fatigue life using laser peening on 2024‐T351 aluminium sheet containing scratch damage: The role of residual stress

Smyth

Toparli

Fitzpatrick

et al. 2019

Fatigue Fract Eng Mat Struct

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The aim of the current work was to study the effect of laser shock peening (LSP) when applied to 2‐mm thick 2024‐T351 aluminium samples containing scratch‐like defects in the form of V‐shaped scribes 50 to 150 μm deep. The scribes decreased fatigue life to 5% of that of the pristine material. The effect of laser peening on fatigue life was dependent on the specifics of the peen treatment, ranging from further reductions in life to restoration of the fatigue life to 61% of pristine material. Fatigue life was markedly sensitive to near‐surface tensile residual stress, even if a compressive residual stress field was present at greater depth. Fatigue life after peening was also dependent on sample distortion generated during the peening process. Sample distortion modified local stresses generated by externally applied loads, producing additional life changes. Models based on residual stress intensity and crack closure concepts were successfully applied to predict fatigue life recovery.

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Evaluating the influence of residual stresses and surface damage on fatigue life of nickel superalloys

Cited by 39 publications

References 19 publications

Effects of Machining Induced Residual Shear and Normal Stresses on Fatigue Life and Stress Intensity Factor of Inconel 718

Effects of Machining Induced Residual Shear and Normal Stresses on Fatigue Life and Stress Intensity Factor of Inconel 718

The effect of surface damage and residual stresses on the fatigue life of nickel superalloys at high temperature

Recovery of fatigue life using laser peening on 2024‐T351 aluminium sheet containing scratch damage: The role of residual stress

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