Fatigue behavior of double-sided laser shock peened Ti-6Al-4V thin blade subjected to foreign object damage

Ren, Xudong; Chen, Bingquan; Jiao, Jiafei; Yu, Yihua; Zhou, Wangfan; Tong, Zhaopeng

doi:10.1016/j.optlastec.2019.105784

Cited by 44 publications

(15 citation statements)

References 36 publications

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“…This condition is known as foreign object damage, and it greatly reduces the fatigue performance of the engine. [67,70,72,85] Foreign object damage will cause the redistribution of the surface stress state of the blade: compressive residual stress is generated beneath the notch, and tensile residual stress is generated near the notch. In addition, when subjected to external cyclic loads during service, stress concentration will occur at the notch.…”

Section: Effects On Fatigue Performancementioning

confidence: 99%

“…A major advantage of LSP is its ability to increase the fatigue resistance of metallic components, as observed in magnesium alloys, [21,23,63] titanium alloys, [64][65][66][67][68][69][70][71][72][73] aluminum alloys, [13,14,20,[74][75][76] carbon and alloy steels, [77][78][79][80][81] and superalloys. [82][83][84] It can be observed from Figure 12 that compared with as-received samples, the S-N curves of the LSP-treated samples move to upper right, indicating better fatigue performance.…”

Section: Effects On Fatigue Performancementioning

confidence: 99%

“…After the blade is pretreated using LSP, the compressive residual stress generated on the specimen surface can reduce the magnitude of the tensile residual stresses and stress concentration caused by foreign object damage, thereby inhibiting the initiation and propagation of cracks and improving the fatigue life. Ren et al [ 67 ] verified the stability of the compressive residual stresses generated by LSP under cyclic loading through experiments, which shows that LSP can effectively improve the fatigue performance of a blade subjected to foreign object damage.…”

Section: Effect Of Lsp On the Mechanical Properties Of Metalsmentioning

confidence: 99%

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Recent Developments and Novel Applications of Laser Shock Peening: A Review

2021

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Wear, corrosion, and fatigue are responsible for more than 80% of the failures of metallic materials. As most failures caused by wear, corrosion, and fatigue initiate from the material surface, surface integrity has a crucial impact on the overall performance of the materials. Surface integrity characteristics, including hardness, microstructure, morphology, roughness, and residual stress status, can significantly affect the wear and corrosion behavior. By improving hardness and introducing beneficial compressive residual stresses in the near-surface region, laser shock peening (LSP) can significantly improve the fatigue performance of metallic materials. In the LSP process, light from a high-energy pulsed laser penetrates through the transparent confinement media and irradiates the ablative coating, quickly heating the affected area to a high temperature and generating high-pressure plasma. The expansion of the plasma causes a shockwave that can plastically deform the target metals, resulting in work hardening and compressive residual stresses. Compared with shot peening (SP), LSP has the following advantages. 1) LSP can produce deeper layers of compressive residual stresses; 2) the process parameters in LSP can be precisely controlled; 3) the surface integrity of the parts after LSP is improved without the need for postprocessing; 4) LSP can be used to treat components with complex geometry; and 5) LSP has a high processing efficiency and makes for a clean working environment. Because LSP represents a new generation of surface strengthening technology that can replace SP, it has gained wide attention. Askar'yan and Moroz measured the pressures exerted by a high-intensity laser beam on the surface of a metal target [1] and found that this pressure is sufficient for steering space vehicles. However, the experiments were conducted under vacuum conditions to prevent dielectric breakdown, and such conditions are not practical for use in industry. [2] Anderholm at Sandia Laboratories irradiated an aluminum film covered in quartz with a laser beam and found that the presence of a transparent confinement layer can significantly increase the shock pressure. [3] Although this experiment was also conducted in vacuum, it proved that with the presence of a transparent confinement layer, a laser power density that does not cause dielectric breakdown in air can also generate a sufficiently large shock pressure. This observation is of great significance for the later industrial applications that involve laser-generated shockwaves.Fairand et al. at Battelle Memorial Institute changed the microstructure of 7075 aluminum alloy through short-pulse, laser-induced shockwaves with a high power density, and they found that after processing, the stress corrosion cracking (SCC) resistance and fatigue performance of the alloy improved. [4] This is a key event in the development of LSP; after this study, the National Science Foundation of the United States began to support the investigation of LSP. Clauer et al. [5] changed the intensity ...

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Section: Effects On Fatigue Performancementioning

confidence: 99%

Section: Effects On Fatigue Performancementioning

confidence: 99%

Section: Effect Of Lsp On the Mechanical Properties Of Metalsmentioning

confidence: 99%

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Recent Developments and Novel Applications of Laser Shock Peening: A Review

2021

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“…Many experimental studies have focused on parameter optimization of the LP process and the effects of LP on the mechanical properties and material performance [12][13][14][15]. However, far fewer attempts have been made to fundamentally understand the wave propagation and corresponding residual stress distribution [16].…”

Section: Introductionmentioning

confidence: 99%

Laser Peening Analysis of Aluminum 5083: A Finite Element Study

Tajyar

Holtham

Brooks

et al. 2021

QuBS

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In this research, a finite element (FE) technique was used to predict the residual stresses in laser-peened aluminum 5083 at different power densities. A dynamic pressure profile was used to create the pressure wave in an explicit model, and the stress results were extracted once the solution was stabilized. It is shown that as power density increases from 0.5 to 4 GW/cm2, the induced residual stresses develop monotonically deeper from 0.42 to 1.40 mm. However, with an increase in the power density, the maximum magnitude of the sub-surface stresses increases only up to a certain threshold (1 GW/cm2 for aluminum 5083). Above this threshold, a complex interaction of the elastic and plastic waves occurring at peak pressures above ≈2.5 Hugoniot Elastic Limit (HEL) results in decreased surface stresses. The FE results are corroborated with physical experiments and observations.

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“…Zhao [10] improved the mechanical properties of titanium alloy treated by LSP in surface residual stress and micro-hardness. Ren [11] estimated the service life of titanium alloy panel treated with double-sided LSP. Ye [12] verified that LSF, as a derivant from LSP, can make thin panel bending toward or away from laser beam, and induce compressive residual stress in the top or bottom surfaces, however, in the surface away from laser beam, the compressive residual stress is too small, and the surface has no harden layer, then the compressive stress can be easily released during service time.…”

Section: Introductionmentioning

confidence: 99%

Improving Mechanical Property and Microstucture Evolution of 7075 Aluminum Panel Formed by Unequal Alternate Double-sided Laser Shock Forming

Yang¹,

Qiao²,

Lu³

et al. 2021

Preprint

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With thrust weight ratio increasing, integral panel is an important component to reduce the aircraft weight, and it is a great challenges to ensure the forming accuracy and mechanical property in the lager-scale panel. Laser shock forming has a great development prospect in achieving integral panel forming and improving its mechanical properties. This work investigated unequal alternate double-sided laser shock forming, which can make 7075 aluminum panel form and induce harden layer in both panel sides. The improvement in mechanical properties and microstucture evolution of 7074 aluminum panel were analyzed after unequal alternate double-sided laser shock forming. The residual stress and microhardness in surface and subsurface were verified to be enhanced by the laser shock wave. The results of XRD and EBSD provided an evidence of grain refinement. The strengthening mechanism of unequal alternate double-sided laser shock forming was analyzed in this work. The grains are distorted and refined during high strain rate plastic deformation due to dislocation slip and accumulation. The mechanical properties were enhanced by unequal alternate double-sided laser shock forming for harden layers in both panel sides. The harden layers and grain refinement has a great significance in inhibiting the crack generation and growth.

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Fatigue behavior of double-sided laser shock peened Ti-6Al-4V thin blade subjected to foreign object damage

Cited by 44 publications

References 36 publications

Recent Developments and Novel Applications of Laser Shock Peening: A Review

Recent Developments and Novel Applications of Laser Shock Peening: A Review

Laser Peening Analysis of Aluminum 5083: A Finite Element Study

Improving Mechanical Property and Microstucture Evolution of 7075 Aluminum Panel Formed by Unequal Alternate Double-sided Laser Shock Forming

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