Numerical simulation and experimentation of overlapping laser shock processing with symmetry cell

Hu, Yongxiang; Yao, Zhenqiang

doi:10.1016/j.ijmachtools.2007.08.021

Cited by 55 publications

(18 citation statements)

References 21 publications

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“…As a result, high compressive residual stresses are generated and confined to a shallow surface layer whilst balancing low-tensile residual stresses are spread deeper throughout the cross-section of the material [12], Enhancement of fatigue, corrosion, stress corrosion and wear resistance has already been proved for various types of materials, such as aluminium and titanium alloys and different types of steel [11][12][13][14][15][16][17][18]. In our recent publication [18], we investigated the effect of LSPwC treatment on corrosion behaviour on an AA6082 aluminium alloy in a 0.6 M NaCI solution.…”

Section: Introductionmentioning

confidence: 99%

Laser shock peening without absorbent coating (LSPwC) effect on 3D surface topography and mechanical properties of 6082-T651 Al alloy

Trdan

Porro

Ocaña

et al. 2012

Surface and Coatings Technology

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The influence of nanosecond laser pulses applied by laser shock peening without absorbent coating (LSPwC) with a Q-switched Nd:YAG laser operating at a wavelength of \ = 1064 nm on 6082-T651 Al alloy has been investigated. The first portion of the present study assesses laser shock peening effect at two pulse densities on three-dimensional (3D) surface topography characteristics. In the second part of the study, the peening effect on surface texture orientation and micro-structure modification, i.e. the effect of surface craters due to plasma and shock waves, were investigated in both longitudinal (L) and transverse (T) directions of the laser-beam movement. In the final portion of the study, the changes of mechanical properties were evaluated with a residual stress profile and Vickers micro-hardness through depth variation in the near surface layer, whereas factorial design with a response surface methodology (RSM) was applied. The surface topographic and micro-structural effect of laser shock peening were characterised with optical microscopy, InfiniteFocus® microscopy and scanning electron microscopy (SEM). Residual stress evaluation based on a hole-drilling integral method confirmed higher compression at the near surface layer (33 um) in the transverse direction (Omin) of laser-beam movement, i.e. -407 ±81 MPa and -346 ± 124 MPa, after 900 and 2500 pulses/cm 2 , respectively. Moreover, RSM analysis of micro-hardness through depth distribution confirmed an increase at both pulse densities, whereas LSPwC-generated shock waves showed the impact effect of up to 800 um below the surface. Furthermore, ANOVA results confirmed the insignificant influence of LSPwC treatment direction on micro-hardness distribution indicating essentially homogeneous conditions, in both I and T directions.

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Section: Introductionmentioning

confidence: 99%

Laser shock peening without absorbent coating (LSPwC) effect on 3D surface topography and mechanical properties of 6082-T651 Al alloy

Trdan

Porro

Ocaña

et al. 2012

Surface and Coatings Technology

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“…in the case is set to 0.23 ms. Compared with the dynamic solution time, 6500 ns, set by Hu and Yao (2008) in LSP simulation, the solution time in the case is two to three orders of the magnitude longer than that in LSP simulation. MPa is greater than material yield stress 290 MPa, which indicates that the metal sheet needs more time to decrease stress gradient.…”

Section: Plastic Deformation Progressmentioning

confidence: 94%

“…In these simulations, the commercial codes ABAQUS/Explicit and ABAQUS/Implicit were employed jointly. Hu and Yao (2008) utilized 3-D FEM with software LS-DYNA and ANSYS, instead of ABAQUS package explicit and implicit, to predict residual stresses of metal alloy subjected to LSP. These simulation processes all include explicit analysis step and subsequent implicit analysis step.…”

Section: Calculation Code Choosingmentioning

confidence: 99%

Simulation on deforming progress and stress evolution during laser shock forming with finite element method

Zhang

She

et al. 2015

Journal of Materials Processing Technology

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“…The transient elastic-plastic deformation and residual stress generation process in the workpiece during LSP can be simulated using the finite element method [84,[87][88][89][90] based on material high strain rate constitutive relations and/or data. The residual stress can be measured using the X-ray diffraction or incremental hole-drilling method.…”

Section: Physics Of Laser Shock Peeningmentioning

confidence: 99%

Micro‐Laser Processing

Özel²

2011

Micro‐Manufacturing

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INTRODUCTIONThe use of laser technology in the processing of materials for micro-products has been reported over the last decade. Laser-based material processing on a microscale has been used in thermal processing, shock peening, surface treatment, cleaning of surfaces, welding, melting and polishing, scribing, as well as micromachining of basic geometric features on a variety of materials [1][2][3][4][5][6][7][8][9][10][11][12].Lasers are usually categorized as two groups: continuous wave (cw) and pulsed lasers. Conventional cw and pulsed laser irradiation and ablation is used in many fields, such as material processing, machining, etching, deposition, sintering, micro-fluidics, medical, and many other applications [13][14][15][16][17][18][19].The use of lasers in micro-manufacturing is closely connected to the characteristics of the laser. The main laser parameters to be chosen and controlled are wavelength, λ (nm); average power (W) or energy (J); intensity (W/m 2 ) or fluence, ( ) (J/m 2 ); pulse duration, τ (s); pulse repetition rates (Hz); and peak power (pulse energy/pulse duration) [9,11,16,20,21].Pulsed lasers achieve much higher intensities than cw lasers and are the preferred solution for the fabrication of micro-sized structures. Long-pulsed (nanosecond, ns), short-pulsed (picoseconds, ps), and ultrashort-pulsed (femtosecond, fs) lasers that are commonly used for repairing, trimming, marking, scribing, texturing, welding, ablation, cutting, and drilling include among others (i) Excimer lasers with ultraviolet (UV) wavelengths, (ii) Ti:sapphire lasers Micro-Manufacturing: Design and Manufacturing of Micro-Products, First Edition. Edited by Muammer Koç and TugrulÖzel.

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Numerical simulation and experimentation of overlapping laser shock processing with symmetry cell

Cited by 55 publications

References 21 publications

Laser shock peening without absorbent coating (LSPwC) effect on 3D surface topography and mechanical properties of 6082-T651 Al alloy

Laser shock peening without absorbent coating (LSPwC) effect on 3D surface topography and mechanical properties of 6082-T651 Al alloy

Simulation on deforming progress and stress evolution during laser shock forming with finite element method

Micro‐Laser Processing

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