Experimental investigation and fatigue life prediction for 7475-T7351 aluminum alloy with and without shot peening-induced residual stresses

Gao, Yu; Wu, Xue Ren

doi:10.1016/j.actamat.2011.03.013

Cited by 129 publications

(77 citation statements)

References 8 publications

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“…This process typically induces increased surface roughness, strain hardening and compressive residual stresses (CRS) within the surface layer [4]. Many investigations have focused on the effect of shot peening on fatigue behaviour in different material systems such as steel [1,3,[5][6][7], aluminium [8][9][10][11][12][13], titanium [8], magnesium [8,14,15] alloys and nickel-based superalloys [16,17]. It can be generally concluded that the roughened surface after the peening treatment may accelerate crack initiation [8], on the other hand, the CRS and strain hardening effects can compensate for this by deferring the short crack onset and propagation process [5,9,10,14,18].…”

Section: Introductionmentioning

confidence: 99%

“…18 were supposed to appear at the very early stages of crack growth, shortly after crack initiation. The crack initiation stage was negligible in this study because the surface (or near surface) stress concentration sites, which were caused by the notch geometry, the inclusions or surface crack-like imperfections introduced by shot peening, are always responsible for the rapid formation of a surface crack [12,13,17]. The size and shape of these initial cracks are directly related to the configuration of the pre-existing defects.…”

Section: Prediction Of the Crack Shape (A/c) Evolutionmentioning

confidence: 99%

“…However, the effects of shot peening on crack shape have rarely been considered in previous work, due to the lack of reliable quantitative experimental data describing crack propagation in the bulk of the material to support relevant modelling work. Therefore, most studies assumed a constant crack shape during crack growth [13] or simulated through-thickness cracks as a simplification of the reality [17,32].…”

Section: Introductionmentioning

confidence: 99%

“…To date, most of the quantitative studies on short crack growth behaviour influenced by shot peening (or other surface treatments resulting in CRS, such as laser shock peening) have relied on analytical [12,13] and finite element (FE) [17,31,32] modelling. According to these analyses, the CRS-induced crack closure, which reduces the effective stress intensity factor (SIF) range, ∆ , has been deemed as the main factor leading to the delayed short crack growth behaviour.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Numerical modelling of the fatigue crack shape evolution in a shot-peened steam turbine material

You

Achintha

et al. 2017

International Journal of Fatigue

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In this study, the short crack initiation and growth behaviour in a notched sample under low-cycle fatigue (LCF) was investigated in a low-pressure steam turbine material. Different crack initiation mechanisms and crack shape evolution processes were experimentally observed in samples subjected to different surface treatments: polished, T0 (industrially applied shot peening process) and T1 (a less intense shot peening process). To better understand the effects of shot peening on fatigue, a 3D finite element (FE) model was developed to investigate the interaction between crack growth and the effects induced by shot peening. Firstly, residual stress redistribution caused by both mechanical loading and the presence of a crack was numerically investigated. This model was also used to successfully predict the differences in crack shape evolution between varying surface conditions, and quantified the retardation of short crack growth behaviour resulting from shot peening. Finally, the 3D model introduced in this study was compared with a previously developed 2D model with plane strain assumptions to demonstrate the limitation of the 2D model in simulating the crack growth behaviour, and to emphasise the importance of taking the 3D crack shape into account when evaluating the short crack growth behaviour.

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Section: Introductionmentioning

confidence: 99%

Section: Prediction Of the Crack Shape (A/c) Evolutionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Numerical modelling of the fatigue crack shape evolution in a shot-peened steam turbine material

You

Achintha

et al. 2017

International Journal of Fatigue

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“…The reason of the larger depth is attributed to high hardness and density of cast steel shots and the correspondingly high kinetic energy that the shots transmit to the treated surface. Gao and Wu 23 demonstrated that fatigue life extension by shot peening can be attributed to beneficial CRSs in the surface layer.…”

Section: Discussionmentioning

confidence: 99%

Surface characterization of Ti1023 alloy shot peened by cast steel and ceramic shot

Yao

Zhang

2017

Advances in Mechanical Engineering

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To optimize the surface properties such as surface roughness, residual stress, and micro-hardness of Ti1023 titanium alloy, the effects of shot peening on Ti1023 alloy were investigated. Surface roughness, surface topography, residual stress, micro-hardness, and micro-structure were carried out at different shot-peening parameters. The results demonstrate that the increased peening intensity enhances the surface roughness, compressive residual stresses, and hardness in subsurface, which is mainly due to the plastic deformation in the near surface layer. Specimen 11 has a low surface roughness of R a = 1.91 mm, well-developed dimple topography, higher compressive residual stress layer depth of 143 mm, and higher hardened layer depth of 200 mm. The ceramic shots with a diameter of 1.08 mm and peening intensity of 0.18 mm A are the optimal shot-peening conditions.

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Enhancing the Structural Performance of Lightweight Metals by Shot Peening

Bagherifard

2019

Adv Eng Mater

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Lightweight metals and metal alloys provide the opportunity to fulfill the exigent weight‐saving requirements for structural components. Mechanical surface treatments, in particular, shot peening and other varieties of impact‐based surface treatments are found to be able to significantly promote the structural application of lightweight metals through enhancing their mechanical performance. Moreover, these treatments have substantiated a notable prospect to modulate the surface–environment interaction of the treated material, bringing in original functionalities in multiple fields of application. Herein, the current state‐of‐the‐art in the implementation of shot peening‐based surface treatments is reviewed regarding lightweight metallic materials. The recent advancements are described focusing on the foremost characteristics of the major lightweight metals commonly used in aerospace, automotive, and biomedical sectors. Emergent applications and the existing challenges are highlighted. Lastly, future perspectives on tailoring the effects of shot peening‐based mechanical surface treatments to boost the appeal of lightweight metals as structural components are provided.

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Experimental investigation and fatigue life prediction for 7475-T7351 aluminum alloy with and without shot peening-induced residual stresses

Cited by 129 publications

References 8 publications

Numerical modelling of the fatigue crack shape evolution in a shot-peened steam turbine material

Numerical modelling of the fatigue crack shape evolution in a shot-peened steam turbine material

Surface characterization of Ti1023 alloy shot peened by cast steel and ceramic shot

Enhancing the Structural Performance of Lightweight Metals by Shot Peening

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