Thickness effect in laser shock processing for test specimens with a small hole under smaller laser power density

Jiang, Yinfang; Li, Xin; Jiang, Wenfan; Wan, Quanhong; Gan, Xuedong; Zhao, Yong; Hua, Cheng; Li, Xu; Zhang, Jie

doi:10.1016/j.optlastec.2019.01.037

Cited by 14 publications

(4 citation statements)

References 13 publications

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“…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]. In this work, the same treatment condition was used in both sample geometries.…”

Section: Residual Stress Distributionmentioning

confidence: 91%

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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Section: Residual Stress Distributionmentioning

confidence: 91%

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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“…The reflection of the shock wave causes formations of a multiple-reflection wave that propagates axially under the action of the constrained layer. Simultaneously, the plasma vapor also forms multiple shock waves under the action of the constrained layer [33]. The longitudinal compression wave, the multiple-reflection wave, and the multiple shock waves are transmitted successively into the interior of the material, with the longitudinal compression wave carrying greater energy than the other waves.…”

Section: Modeling the Shock Wave Propagation In E690 High-strength Steelmentioning

confidence: 99%

Formation Mechanism and Weights Analysis of Residual Stress Holes in E690 High-Strength Steel by Laser Shock Peening

et al. 2022

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To investigate the surface residual stress hole formation mechanism induced by laser shock peening (LSP) in an E690 high-strength steel sheet and to assign weights to the relevant causes; E690 steel samples were loaded using four laser beams with different power densities. The dynamic strain in thin plate samples was measured using a polyvinylidene fluoride piezoelectric sensor during LSP and the residual stress distributions on thin- and thick-plate samples were studied using an X-ray stress analyzer. The residual stress distribution of the simulated laser shock E690 high-strength steel sheet was consistent with that of the measured residual stress field, and the propagation pattern induced by a pulsed laser shock wave obtained via simulation shows good consistency with the surface dynamic strain test results. A shock wave propagation model was established for E690 high-strength steel sheets. At laser power densities of 1.98 and 2.77 GW/cm2, the residual stress fields obtained through simulations and experiments show the residual stress hole phenomenon. The combined effect of the shock wave, which is reflected back and forth, and the rarefaction waves that converge toward the center produced the residual stress hole phenomenon, and shock wave reflection has a slightly greater impact than surface rarefaction wave convergence on the residual stress holes on the material’s surface. When the laser power density is 4.07 GW/cm2, the maximum residual principal stress is distributed uniformly.

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“…LSP strengthens the material surface to regulate the stress distribution on the inner wall of the small hole [15,16] by pre-setting residual compressive stress and improving the microstructure, LSP significantly improves the high-cycle fatigue performance of metal materials [17]. However, when applied to hole structures in thicker plates, the depth of the residual compressive stress layer induced by laser shock processing (LSP) is insufficient, resulting in residual tensile stresses even in the middle of the hole wall, which produces a thickness effect, thus limiting the fatigue life of the workpiece [18,19]. To overcome the existing limitations of LSP-reinforced small-hole components, we combined ultrasonic extrusion strengthening (UES) with LSP to form a new strengthening method-laser shock processing and ultrasonic extrusion (LUE).…”

Section: Introductionmentioning

confidence: 99%

Investigation of Residual Stress Distribution and Fatigue of 7050-T7451 Alloy Hole Components with Laser Shock and Ultrasonic Extrusion

Jiang,

Liu,

Wang

et al. 2024

Metals

Self Cite

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Small-hole structures, such as the millions of fastener holes found on aircraft, are typical stress-concentration structures prone to fatigue failure. To further improve the strengthening process of this small-hole structure, we make up for the limitations of laser shock processing (LSP) of small holes by combining it with the ultrasonic extrusion strengthening (UES) process to form a new strengthening method—laser shock and ultrasonic extrusion strengthening (LUE). The influence of the LUE process sequence and process parameters on residual stress distribution was studied through FEM, and the gain of fatigue life of specimens after LUE strengthening was also explored through tests. The results show that when using LUE technology, the friction force decreases with the increase in amplitude and decreases by 3.2% when the amplitude is maximum. The LUE process eliminates the thickness effect generated by LSP, which can achieve good stress distribution of small-hole components under smaller laser shock peak pressure, and reduces equipment power. LUE can significantly improve the fatigue life of small-hole components, and the maximum fatigue life gain can be up to 310.66%.

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Thickness effect in laser shock processing for test specimens with a small hole under smaller laser power density

Cited by 14 publications

References 13 publications

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

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

Formation Mechanism and Weights Analysis of Residual Stress Holes in E690 High-Strength Steel by Laser Shock Peening

Investigation of Residual Stress Distribution and Fatigue of 7050-T7451 Alloy Hole Components with Laser Shock and Ultrasonic Extrusion

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