Experimental and numerical investigation of residual stresses in laser shock peened AA2198

Keller, Sören; Chupakhin, Sergey; Staron, Peter; Maawad, Emad; Kashaev, Nikolai; Klusemann, Benjamin

doi:10.1016/j.jmatprotec.2017.11.023

Cited by 110 publications

(52 citation statements)

References 25 publications

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“…Overall, higher laser pulse energies lead to higher compressive residual stresses at the depth of one millimeter, whereas the maximum value of compressive stresses does not seem to be affected significantly. In previous studies [8,10,11], it was observed that an increased energy density leads to deeper residual stresses which agrees with the results obtained by varying the energy input from 1 J to 3 J. However, the increase to 3 J did not lead to increased maximum residual stresses for the performed experiments.…”

Section: Influence Of Laser Pulse Energysupporting

confidence: 89%

See 1 more Smart Citation

Effect of Laser Peening Process Parameters and Sequences on Residual Stress Profiles

Kallien

Keller

Ventzke

et al. 2019

Metals

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Laser Peening (LP) is a surface modification technology that can induce high residual stresses in a metallic material. The relation between LP process parameters, in particular laser sequences, as well as pulse parameters and the resulting residual stress state was investigated in this study. The residual stress measurements, performed with the hole drilling technique, showed a non-equibiaxial stress profile in laser peened AA2024-T3 samples with a clad layer for certain parameter combinations. Shot overlap and applied energy density were found to be crucial parameters for the characteristic of the observed non-equibiaxial residual stress profile. Furthermore, the investigation showed the importance of the advancing direction, as the advancing direction influences the direction of the higher compressive residual stress component. The direction of higher residual stresses was parallel or orthogonal to the rolling direction of the material. The effect was correlated to the microstructural observation obtained via electron backscattered diffraction. Additionally, for peening with two sequences of different advancing directions, the study showed that the order of applied advancing directions was important for the non-equibiaxiality of the resulting residual stress profile.

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Section: Influence Of Laser Pulse Energysupporting

confidence: 89%

“…The achievable maximum residual stress values are limited by the material's yield strength. Multiple investigations [9][10][11] have observed increased residual stresses for higher energy densities. Multiple shots on one area lead to higher and deeper residual stresses [5,9,12].…”

Section: Introductionmentioning

confidence: 99%

Effect of Laser Peening Process Parameters and Sequences on Residual Stress Profiles

Kallien

Keller

Ventzke

et al. 2019

Metals

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“…[7] In recent years, (multi-impact) shot peening, ultrasonic peening, or laser shock peening models have been investigated by several researchers. [8][9][10][11][12][13] In contrast, single-impact models are rarely reported. Boyce et al [14] investigated the residual stresses caused by a spherical projectile impacting upon a flat surface to investigate the reduction in component lifetime due to foreign object damage.…”

Section: Introductionmentioning

confidence: 99%

Combined experimental–numerical study on residual stresses induced by a single impact as elementary process of mechanical peening

Sandmann

Nielsen

Keller

et al. 2020

Strain

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Peening processes can be used as a fatigue enhancement treatment for metallic structures by locally introducing compressive residual stresses. A combined experimental-numerical study on a single-impact process with a drop tower on the aluminium alloy AA5754, representing the elementary process of mechanical peening, has been performed to investigate different impact parameters on the residual stress profile. Residual stresses have been measured using high-energy X-Ray diffraction. A three-dimensional finite element model is used to predict the residual stresses numerically. The elastic strain components from the numerical results are used to calculate residual stresses by assuming either a plane stress or a plane strain state for different specimen thickness to assess the validity of respective assumption. The validity of the numerical simulation is evaluated based on comparisons of the elastic strain profiles and the percentage loss in kinetic energy of the steel ball due to the impact for four different energies, showing overall a good agreement in the experimental-numerical comparisons.

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“…Laser shock peening (LSP) is a very promising technique for introducing deep compressive residual stresses in metallic materials [1][2]. The LSP process is essentially based on high-energy pulsed laser beams, which cause the propagation of shock waves in materials or components, and thereby of near-surface compressive residual stresses and work hardening [3][4].…”

Section: Introductionmentioning

confidence: 99%

Fatigue Life Extension of AA2024 Specimens and Integral Structures by Laser Shock Peening

et al. 2018

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Abstract. The goal of the present study is to understand the effects of laser shock peening (LSP)-induced residual stresses on the fatigue crack propagation (FCP) behaviour of the commonly used aircraft aluminium alloy AA2024 in T3 heat treatment condition. LSP treatment was performed using a pulsed Nd:YAG laser on compact tensile C(T)50-specimens with a thickness of 2.0 mm. LSP-treated specimens reveal a significant retardation of the fatigue crack propagation. The fatigue crack retardation effect can be correlated with the compressive residual stresses introduced by LSP throughout the entire specimen thickness. A possible application of the LSP process on a component like panel with three welded stringers representing a part of a fuselage structure was performed as well. The skin-stringer AA2024-AA7050 Tjoints were realised through stationary shoulder friction stir welding (SSFSW), a variant of the conventional friction stir welding process. In this relatively new process, the shoulder does not rotate and therefore does not contribute to the heat generation. Consequently, a reduced and more homogeneous heat input leads to a less affected microstructure and better mechanical properties. The efficiency of the LSP process has been demonstrated resulting in an increase of 200 -400% in fatigue lifetime.

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Experimental and numerical investigation of residual stresses in laser shock peened AA2198

Cited by 110 publications

References 25 publications

Effect of Laser Peening Process Parameters and Sequences on Residual Stress Profiles

Effect of Laser Peening Process Parameters and Sequences on Residual Stress Profiles

Combined experimental–numerical study on residual stresses induced by a single impact as elementary process of mechanical peening

Fatigue Life Extension of AA2024 Specimens and Integral Structures by Laser Shock Peening

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