Thermomechanical relaxation of residual stress in shot peened nickel base superalloy

Cao, Weicheng; Khadhraoui, M.; Brenier, B.; Guédou, Jean-Yves; Castex, L.

doi:10.1179/mst.1994.10.11.947

Cited by 52 publications

(34 citation statements)

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“…Holzapfel et al [7] describe residual stress relaxation consisting of three different stages: (1) relaxation due to specimen heating; (2) relaxation during the first cycle; and (3) relaxation with the logarithm of cycle count. A similar approach by Cao et al [6] describes thermomechanical relaxation as a two-stage process, in which the first stage is a shakedown of the initial residual stresses described by a monotonic stress strain law, and a second stage that is slower and is described by a cyclic softening related to the logarithm of number of the applied cycles.…”

Section: Relaxation Of Shot Peened Residual Stressesmentioning

confidence: 99%

“…Vöhringer and coworkers [7] recognized that in addition to temperature and exposure time, the state of the material microstructure is itself another parameter that affects relaxation rate of residual stresses. Cao and colleagues [6] developed a thermal recovery model based on the decreasing half-width of x-ray diffraction peaks which they attributed to annihilation and reorganization of crystalline defects. The thermal recovery was modeled as a macroscopic recovery strain that was a function of time and temperature.…”

Section: Relaxation Of Shot Peened Residual Stressesmentioning

confidence: 99%

“…Thermal relaxation studies on shot peened steels [7], titanium alloys [3] and nickel alloys [3][4]6,[8][9] have demonstrated that relaxation of residual stresses may occur at relatively low temperatures and over short durations. Vöhringer and coworkers [7] recognized that in addition to temperature and exposure time, the state of the material microstructure is itself another parameter that affects relaxation rate of residual stresses.…”

Section: Relaxation Of Shot Peened Residual Stressesmentioning

confidence: 99%

“…Numerous studies have characterized the beneficial effects of compressive residual surface stresses on fatigue life for aluminum-, titanium-and nickel-base alloys [1][2][5][6]. For applications that utilize aluminum and titanium alloys, subjected to moderate temperatures and stresses, residual stresses are assumed to be stable with repeated cyclic stress-controlled loading.…”

Section: Relaxation Of Shot Peened Residual Stressesmentioning

confidence: 99%

“…Numerous studies [3][4][5][6][7][8][9][10] on steels, titanium and nickel-base superalloys have shown that residual stresses generated via surface treatment relax when subjected to elevated temperature exposure or mechanical loading. A variety of sophisticated empirical models have been developed and shown to capture trends in residual stress relaxation [5][6][7]10]. However, material microstructure, hardening behavior, plastic strain, and the underlying physical deformation mechanisms responsible for stress relaxation are not incorporated into many of these models.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

A Coupled Creep Plasticity Model for Residual Stress Relaxation of a Shot Peened Nickel-Base Superalloy

Buchanan¹,

John²,

Brockman³

et al. 2008

Superalloys 2008 (Eleventh International Symposium)

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Shot peening is a commonly used surface treatment process that imparts compressive residual stresses into the surface of metal components. Compressive residual stresses retard initiation and growth of fatigue cracks. During the component loading history, the shot-peened residual stresses may change due to thermal exposure, creep, and cyclic loading. In these instances, taking full credit for compressive residual stresses would result in a nonconservative life prediction. This paper describes a methodical approach for characterizing and modeling residual stress relaxation under elevated temperature loading, near and above the monotonic yield strength of IN100. The model incorporates the dominant creep deformation mechanism, coupling between the creep and plasticity models, and effects of prior plastic strain. The initial room temperature residual stress and plastic strain profiles provide the initial conditions for relaxation predictions using the coupled creep-plasticity model. Model predictions correlate well with experimental results on shot-peened dogbone specimens subject to single cycle and creep loading conditions at elevated temperature. The predictions accurately capture both the shape and magnitude of the retained residual stress profile.

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Section: Relaxation Of Shot Peened Residual Stressesmentioning

confidence: 99%

Section: Relaxation Of Shot Peened Residual Stressesmentioning

confidence: 99%