Stress Relaxation in Shot-Peened Geometric Features Subjected to Fatigue: Experiments and Modelling

Achintha, Mithila; You, Chao; He, Bin; Soady, K.A.; Reed, P.A.S.

doi:10.4028/www.scientific.net/amr.996.729

Cited by 2 publications

(4 citation statements)

References 10 publications

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“…Based on previous findings , N = 8 has been chosen for the T0 process and the corresponding depth of the eigenstrain distribution has been assumed to be 0.4 mm. Using the same approach, N = 4 and a eigenstrain depth of 0.2 mm were determined for the T1 process.…”

Section: Numerical Modelling and Discussionmentioning

confidence: 99%

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Low cycle fatigue life prediction in shot‐peened components of different geometries—part I: residual stress relaxation

You

Achintha

Soady³

et al. 2016

Fatigue Fract Eng Mat Struct

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In this study, the residual stress relaxation behaviour occurring during low-cycle fatigue in shot-peened specimens with either a flat or a notched geometry has been studied. A representative low-pressure steam turbine material, FV448, was used. The residual stress and strain hardening profiles caused by shot peening were measured experimentally and were then incorporated into a finite element model. By allowing for both effects of shot peening, the residual stress relaxation behaviour was successfully simulated using this model and correlated well with the experimental data. Although more modelling work may be required to simulate the interaction between shot peening effects and external loads in a range of notched geometries, the model predictions are consistent with the specimens tested in the current study. The novelty of this study lies in the development of such a modelling approach which can be used to effectively simulate the complex interaction between shot peening effects and external loads in notched regions. Compared with the un-notched geometry, the notched geometry was found to be more effective in retaining the improvement in fatigue life resulting from shot peening, by restricting the compressive residual stress relaxation during fatigue loading.

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Section: Numerical Modelling and Discussionmentioning

confidence: 99%

“…The authors have previously presented the logic of an eigenstrains‐based FE modelling of residual stresses and the relaxation of residual stress in a shot‐peened flat geometry. The work presented in the paper is limited to a single geometry and a simple material model (i.e.…”

Section: Introductionmentioning

confidence: 99%

Low cycle fatigue life prediction in shot‐peened components of different geometries—part I: residual stress relaxation

You

Achintha

Soady³

et al. 2016

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

show abstract

“…12 Additionally, for relatively extreme Low-Cycle Fatigue (LCF) conditions (<10,000 cycles), the application of relatively high strain ranges (>1%) can relax the compressive residual stress produced from shot peening within the first 1% of fatigue life for FV448 material. 5,9,[13][14][15] With a diminished compressive residual stress field, the retardation effect from shot peening on short crack propagation is no longer apparent. Studies have shown that the benefits of shot peening outweigh the drawbacks for the majority of fatigue situations, resulting in an improved resistance to fatigue overall, including for in-service turbine blades in low-cycle fatigue conditions.…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, for relatively extreme Low‐Cycle Fatigue (LCF) conditions (<10,000 cycles), the application of relatively high strain ranges (>1%) can relax the compressive residual stress produced from shot peening within the first 1% of fatigue life for FV448 material 5,9,13–15 . With a diminished compressive residual stress field, the retardation effect from shot peening on short crack propagation is no longer apparent.…”

Section: Introductionmentioning

confidence: 99%

Fatigue crack initiation and growth behavior within varying notch geometries in the low‐cycle fatigue regime for FV566 turbine blade material

Cunningham

Leering

Fan

et al. 2023

Fatigue Fract Eng Mat Struct

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Plain bend bars made from FV566 martensitic stainless steel were extracted from the root of ex‐service power plant turbine blades and several industry‐relevant notch geometries were introduced. Some of the samples were shot peened. The notched bend bars were loaded plastically in the low‐cycle fatigue regime and finite element (FE) modeling carried out to investigate the effects of changing notch geometry, combined with shot peening, on fatigue behaviors such as crack initiation, short crack growth, and coalescence. Shot peening damaged the notch surface, accelerating initiation behaviors, but had a lifetime‐extending effect by retarding short crack growth in all tested notch geometries. At a total strain range higher than 1.2%, the lifetime extension benefit from shot peening was diminished due to compressive residual stress relaxation in the notch stress field. Notch geometry (and the associated varying constraint levels and stress/strain gradients) was found to have no notable difference on fatigue life when tested at identical notch‐root strain ranges.

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Stress Relaxation in Shot-Peened Geometric Features Subjected to Fatigue: Experiments and Modelling

Cited by 2 publications

References 10 publications

Low cycle fatigue life prediction in shot‐peened components of different geometries—part I: residual stress relaxation

Low cycle fatigue life prediction in shot‐peened components of different geometries—part I: residual stress relaxation

Fatigue crack initiation and growth behavior within varying notch geometries in the low‐cycle fatigue regime for FV566 turbine blade material

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