Effects of laser peening on the fatigue strength and defect tolerance of aluminum alloy

Takahashi, Koji; Kogishi, Yuta; Shibuya, Norihito; Kumeno, Fumiaki

doi:10.1111/ffe.13201

Cited by 34 publications

(30 citation statements)

References 35 publications

(81 reference statements)

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“…Sikhamov et al [19] exhibited healing of initial cracks in AA2024-T3 alloy with a fastener hole due to LSP, which improved fatigue life by increasing the crack growth period. Moreover, the crack closure mechanism induced by LSP in pre-cracked components has been reported by other researchers as well with some even claiming LSP of pre-cracked specimen increases fatigue life by almost 4 times that of unpeened component without any initial crack [20,21].…”

Section: Introductionsupporting

confidence: 56%

Fatigue performance of laser shock peened Ti6Al4V and Al6061-T6 alloys

Maharjan¹,

Chan²,

Ramesh³

et al. 2020

Preprint

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Propagation of fatigue crack in laser shock peened metallic component is retarded by introduction of deep compressive residual stresses during the process. Apart from large compressive residual stress build-up near the surface, surface topography is also significantly altered during laser shock peening. However, a systematic evaluation of the individual effects of residual stresses and surface topography as well as their interaction effects on fatigue crack initiation and growth is still lacking. This study investigates the effect of laser shock peening on near surface properties of Ti6Al4V and Al6061-T6 alloys and how these changes dictate their overall fatigue performance. The results show that both surface residual stresses and surface topography influence the fatigue life of a component. It is found that fatigue life of Ti6Al4V alloy increased by at least 1.28 times after laser shock peening. In contrast, the improvement is minimal for Al6061-T6 alloy due to the surface roughening effect introduced by laser peening which results in early crack initiation and negates the beneficial effect of compressive residual stresses.

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Section: Introductionsupporting

confidence: 56%

Fatigue performance of laser shock peened Ti6Al4V and Al6061-T6 alloys

Maharjan¹,

Chan²,

Ramesh³

et al. 2020

Preprint

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show abstract

“…LSP treatment has a strong beneficial effect on the fatigue performance of structural components because the compressive residual stress field induced in the material considerably retards fatigue crack growth 27–34 . Therefore, a significant improvement in the fatigue behaviour and lifetime prolongation can be achieved for components and structures with surface cracks 27,28,31,34 as well as through‐thickness cracks 29,30,32,33 . Lin et al have investigated the effect of LSP on the fatigue strength of engine components subjected to foreign object damage (FOD), where LSP is applied before FOD 35 .…”

Section: Introductionmentioning

confidence: 99%

On the application of laser shock peening for retardation of surface fatigue cracks in laser beam‐welded AA6056

Kashaev

Ushmaev

Ventzke

et al. 2020

Fatigue Fract Eng Mat Struct

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The present study aims to investigate the extent to which the fatigue behaviour of laser beam-welded AA6056-T6 butt joints with an already existing crack can be improved through the application of laser shock peening. Ultrasonic testing was utilized for in situ (nondestructive) measurement of fatigue crack growth during the fatigue test. This procedure allowed the preparation of welded specimens with surface fatigue cracks with a depth of approximately 1.2 mm. The precracked specimens showed a 20% reduction in the fatigue limit compared with specimens without cracks in the as-welded condition. Through the application of laser shock peening on the surfaces of the precracked specimens, it was possible to recover the fatigue life to the level of the specimens tested in the as-welded condition. The results of this study show that laser shock peening is a very promising technique to recover the fatigue life of welded joints with surface cracks, which can be detected by nondestructive testing. K E Y W O R D Saluminium alloys, fatigue crack, laser beam welding, laser shock peening, residual stress, ultrasonic crack tip diffraction

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“…Sikhamov et al 19 exhibited healing of initial cracks in AA2024‐T3 alloy with a fastener hole due to LSP, which improved fatigue life by increasing the crack growth period. Moreover, the crack closure mechanism induced by LSP in precracked components has been reported by other researchers as well with some even claiming LSP of precracked specimen increases fatigue life by almost four times that of unpeened component without any initial crack 20,21 …”

Section: Introductionmentioning

confidence: 53%

“…Moreover, the crack closure mechanism induced by LSP in precracked components has been reported by other researchers as well with some even claiming LSP of precracked specimen increases fatigue life by almost four times that of unpeened component without any initial crack. 20,21 Although all these studies show the retardation of fatigue crack growth after LSP, little attention is paid towards the influence of peening on crack initiation. In addition to the modification in residual stresses, other surface features such as roughness, hardness and microstructure also change during LSP.…”

Section: Introductionmentioning

confidence: 99%

Fatigue performance of laser shock peened Ti6Al4V and Al6061‐T6 alloys

Maharjan¹,

Chan²,

Ramesh³

et al. 2020

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

Propagation of fatigue crack in laser shock peened metallic component is retarded by introduction of deep compressive residual stresses during the process. Apart from large compressive residual stress build‐up near the surface, surface topography is also significantly altered during laser shock peening. However, a systematic evaluation of the individual effects of residual stresses and surface topography as well as their interaction effects on fatigue crack initiation and growth is still lacking. This study investigates the effect of laser shock peening on near‐surface properties of Ti6Al4V and Al6061‐T6 alloys and how these changes dictate their overall fatigue performance. Microstructure, surface topography, hardness and residual stress state of the alloys are investigated before and after peening, and four‐point bending fatigue tests are performed to obtain Wöhler curves (S‐N curves) for each case. The results show that both surface residual stresses and surface topography influence the fatigue life of a component. Compressive residual stresses were induced to a depth beyond 1 mm for both alloys. Fatigue life of Ti6Al4V alloy increased by at least 1.28 times after laser shock peening due to the introduction of deep compressive residual stresses with minimal change in surface topography. By contrast, the improvement is nominal for Al6061‐T6 alloy due to the surface roughening effect introduced by laser peening, which results in early crack initiation and negates the beneficial effect of compressive residual stresses.

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Effects of laser peening on the fatigue strength and defect tolerance of aluminum alloy

Cited by 34 publications

References 35 publications

Fatigue performance of laser shock peened Ti6Al4V and Al6061-T6 alloys

Fatigue performance of laser shock peened Ti6Al4V and Al6061-T6 alloys

On the application of laser shock peening for retardation of surface fatigue cracks in laser beam‐welded AA6056

Fatigue performance of laser shock peened Ti6Al4V and Al6061‐T6 alloys

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