The effects of laser shock peening scanning patterns on residual stress distribution and fatigue life of AA2024 aluminium alloy

Adu-Gyamfi, Samuel; Ren, Xudong; Larson, Enoch Asuako; Ren, Yunpeng; Tong, Zhaopong

doi:10.1016/j.optlastec.2018.06.036

Cited by 61 publications

(9 citation statements)

References 34 publications

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“…The SP process is further categorized based on the size, shape, material, intensity of peening medium during blasting, and associated peening mechanisms. Apart from the conventional SP, the other popular methods include fine particle SP, cavitation peening, water jet peening, and shock peening . The gentle SP with finer medium does not cause any significant increase in surface roughness; the compressive residual stresses generated are capable of enhancing the fatigue life of Al alloys .…”

Section: Introductionmentioning

confidence: 96%

“…Apart from the conventional SP, the other popular methods include fine particle SP, cavitation peening, water jet peening, and shock peening. 18,19 The gentle SP with finer medium does not cause any significant increase in surface roughness; the compressive residual stresses generated are capable of enhancing the fatigue life of Al alloys. 20,21 However, the shallower peening depth created through such gentle SP gets consumed during the formation of thicker MAO coating, and therefore the overall benefit of peening is lost.…”

Section: Introductionmentioning

confidence: 99%

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Enhancing the high cycle fatigue life of high strength aluminum alloys for aerospace applications

Krishna

Madhavi

Sahithi

et al. 2018

Fatigue Fract Eng Mat Struct

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Hard anodized (HA) and micro arc oxidation (MAO) coatings of identical thickness were deposited on two different high strength aluminum (Al) alloys namely, 2024‐T3 and 7075‐T6. Further, as received Al alloys were also subjected to shot peening (SP) to induce subsurface compressive residual stresses followed by the MAO coating deposition (SP + MAO). The average velocity of particle‐in‐flight during the SP process was measured and utilized to calculate the kinetic energy of the peening particles. The bare and coated alloys were subjected to completely reversed stress (R = −1) rotating beam high cycle fatigue tests at five different stress levels. In addition, the bare and coated alloys were also evaluated for their tensile properties, elemental composition, phase constituents, surface, and cross‐sectional morphologies including the surface roughness (Ra, Rz) and correlated the same with the corresponding fatigue behavior. Irrespective of substrate alloy composition and stress levels investigated, the duplex SP + MAO treatment resulted in significant fatigue life enhancement over and above the fatigue life of corresponding bare (not shot peened) Al alloy, while the hard anodized and plain MAO (both without prior shot peening) continue to exhibit significant fatigue debit. Driven by the compressive residual stresses present beneath the subsurface region of SP + MAO coating interface, fractured surface examination of SP + MAO coatings clearly highlights the crack‐branching associated multiple crack deflection as the predominant operative mechanism responsible for diminishing the crack growth rate and therefore enhance the fatigue life as compared with the near linear crack extension without significant deflections leading to relative premature failure of plain MAO coated alloys.

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Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Enhancing the high cycle fatigue life of high strength aluminum alloys for aerospace applications

Krishna

Madhavi

Sahithi

et al. 2018

Fatigue Fract Eng Mat Struct

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“…As is well known, the compressive residual stress plays a positive role in extending fatigue life of workpiece in practice (Zhang, Li, Yu, Zhou, Duan, Li, Huang and Zuo, 2015;Adu-Gyamfi et al, 2018). It can retard significantly fatigue crack growth rate during the fatigue wear.…”

Section: Micro Dent Fabricated By Laser Shockingmentioning

confidence: 96%

Experiment and numerical simulation of micro dent fabricated by laser shocking 2024 aluminum alloy

Fang

Zhang

et al. 2019

MMMS

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Purpose The purpose of this paper is to investigate the dynamic forming process of the micro dent fabricated by laser shock processing on 2024-T3 aluminum alloy. The effect of laser pluse energy on the deformation of micro dent was also discussed in detail. Design/methodology/approach It uses finite element analysis method and the corresponding laser shocking experiment. Findings The results demonstrate that the dynamic formation process of micro dent lasts longer in comparison with the shock wave loading time, and the depths of micro dents increase with the increasing laser energy. In addition, laser shocking with higher energy can result in more obvious pileup occurred at the outer edge of micro dent. Originality/value Surface micro dents can serve as fluid reservoirs and traps of the wear debris, which can decrease the effects of the wear and friction in rolling and sliding interfaces. The investigations can not only be propitious to comprehensively understand the forming mechanism of laser-shocked dent, but also be beneficial to get sight into the residual stress field induced by laser shocking.

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“…e notched geometry has a symmetric axis in cross-direction that distributes the residual stress field more evenly in comparison with asymmetric axis corresponding to fillet sample. Several works have demonstrated that both the pulse sequence [24,25] and the coverage area [26] modify the distribution of residual stress in sample edge and the middle of thickness. Further, other geometrical parameters such as the sample thickness also have a significant effect on the distribution of residual stresses as reported in [19,27].…”

Section: Residual Stress Distributionmentioning

confidence: 99%

Fatigue Life Behavior of Laser Shock Peened Duplex Stainless Steel with Different Samples Geometry

Jiménez

Granados-Alejo²,

Rubio-González

et al. 2019

Advances in Materials Science and Engineering

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Two different stress raiser geometries (fillets and notched) were treated by laser shock peening (LSP) in order to analyze the effect of sample geometry on fatigue behavior of 2205 duplex stainless steel (DSS). The LSP treatment was carried through Nd : YAG pulsed laser with 1064 nm wavelength, 10 Hz frequency, and 0.85 J/pulse. Experimental and MEF simulation results of residual stress distribution after LSP were assessed by hole drilling method and ABAQUS/EXPLICIT software, respectively. The fatigue tests (tensile-tensile axial stress) were realized with stress ratio of R = 0.1 and 20 Hz. A good comparison of residual stress simulation and experimental data was observed. The results reveal that the fatigue life is increased by LSP treatment in the notched samples, while it decreases in the fillet samples. This is related to the residual stress distribution after LSP that is generated in each geometry type. In addition, the fatigue crack growth direction is changed according to geometry type. Both the propagation direction of fatigue crack and the anisotropy of this steel results detrimental in fillet samples, decreasing the number of cycles to the fatigue crack initiation. It is demonstrated that the LSP effect on fatigue performance is influenced by the specimen geometry.

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The effects of laser shock peening scanning patterns on residual stress distribution and fatigue life of AA2024 aluminium alloy

Cited by 61 publications

References 34 publications

Enhancing the high cycle fatigue life of high strength aluminum alloys for aerospace applications

Enhancing the high cycle fatigue life of high strength aluminum alloys for aerospace applications

Experiment and numerical simulation of micro dent fabricated by laser shocking 2024 aluminum alloy

Fatigue Life Behavior of Laser Shock Peened Duplex Stainless Steel with Different Samples Geometry

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