Massive parallel laser shock peening: Simulation, analysis, and validation

Warren, A. W.; Guo, Y. B.; Chen, S.C.

doi:10.1016/j.ijfatigue.2007.01.033

Cited by 145 publications

(59 citation statements)

References 18 publications

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“…A successful engineering application is laser shot peening, leading to strain hardening and compressive residual stresses that have been shown to significantly enhance metals resistance to fatigue and corrosion [1][2][3]. Another one is laser shock-induced permanent compaction of porous materials such as sintered steels, over a few hundreds of µm below the loaded surface [4], to improve their mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Laser-Driven Ramp Compression to Investigate and Model Dynamic Response of Iron at High Strain Rates

Amadou

Brambrink

Rességuier

et al. 2016

Metals

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Efficient laser shock processing of materials requires a good characterization of their dynamic response to pulsed compression, and predictive numerical models to simulate the thermomechanical processes governing this response. Due to the extremely high strain rates involved, the kinetics of these processes should be accounted for. In this paper, we present an experimental investigation of the dynamic behavior of iron under laser driven ramp loading, then we compare the results to the predictions of a constitutive model including viscoplasticity and a thermodynamically consistent description of the bcc to hcp phase transformation expected near 13 GPa. Both processes are shown to affect wave propagation and pressure decay, and the influence of the kinetics of the phase transformation on the velocity records is discussed in details.

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Section: Introductionmentioning

confidence: 99%

Laser-Driven Ramp Compression to Investigate and Model Dynamic Response of Iron at High Strain Rates

Amadou

Brambrink

Rességuier

et al. 2016

Metals

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“…The above shown microstructural changes introduced by the optimized LSP may cause improvements of mechanical properties such as hardness, tensile strength, and fatigue strength, as it was previously discussed by Warren et al [36] and Ren et al [35].…”

Section: Comparison Of Results Obtained By Laser Operating At 1064 Nmmentioning

confidence: 62%

Picosecond Laser Shock Peening of Nimonic 263 at 1064 nm and 532 nm Wavelength

Petronić

Šibalija

Burzić

et al. 2016

Metals

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Abstract:The paper presents a study on the surface modifications of nickel based superalloy Nimonic 263 induced by laser shock peening (LSP) process. The process was performed by Nd 3+ :Yttrium Aluminium Garnet (YAG) picosecond laser using the following parameters: pulse duration 170 ps; repetition rate 10 Hz; pulse numbers of 50, 100 and 200; and wavelength of 1064 nm (with pulse energy of 2 mJ, 10 mJ and 15 mJ) and 532 nm (with pulse energy of 25 mJ, 30 mJ and 35 mJ). The following response characteristics were analyzed: modified surface areas obtained by the laser/material interaction were observed by scanning electron microscopy; elemental composition of the modified surface was evaluated by energy-dispersive spectroscopy (EDS); and Vickers microhardness tests were performed. LSP processing at both 1064 nm and 532 nm wavelengths improved the surface structure and microhardness of a material. Surface morphology changes of the irradiated samples were determined and surface roughness was calculated. These investigations are intended to contribute to the study on the level of microstructure and mechanical properties improvements due to LSP process that operate in a picosecond regime. In particular, the effects of laser wavelength on the microstructural and mechanical changes of a material are studied in detail.

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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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Massive parallel laser shock peening: Simulation, analysis, and validation

Cited by 145 publications

References 18 publications

Laser-Driven Ramp Compression to Investigate and Model Dynamic Response of Iron at High Strain Rates

Laser-Driven Ramp Compression to Investigate and Model Dynamic Response of Iron at High Strain Rates

Picosecond Laser Shock Peening of Nimonic 263 at 1064 nm and 532 nm Wavelength

Micro‐Laser Processing

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