Modeling and simulation of laser shock waves in elasto-plastic 1D layered specimens

2022 ◽  
pp. 111422
Author(s):  
L. Lapostolle ◽  
K. Derrien ◽  
L. Morin ◽  
L. Berthe ◽  
O. Castelnau
Keyword(s):  
Shock Waves ◽  
Modeling And Simulation ◽  
Laser Shock

Laser shock waves: A way to test and damage composite materials for aeronautic applications

2012 ◽  
Author(s):  
R. Ecault ◽  
M. Boustie ◽  
L. Berthe ◽  
F. Touchard
Keyword(s):  
Composite Materials ◽  
Shock Waves ◽  
Laser Shock

scholarly journals Investigation of Corrosion Behaviour of Aluminium Alloy Subjected to Laser Shock Peening without a Protective Coating

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
U. Trdan ◽  
J. Grum
Keyword(s):  
Shock Waves ◽  
Protective Coating ◽  
Corrosion Behaviour ◽  
Laser Shock Peening ◽  
Anodic Current Density ◽  
Strain Rates ◽  
Laser Shock ◽  
Near Surface ◽  
Shock Peening ◽  
Chloride Environment

The effect of shock waves and strain hardening of laser shock peening without protective coating (LSPwC) on alloy AA 6082-T651 was investigated. Analysis of residual stresses confirmed high compression in the near surface layer due to the ultrahigh plastic strains and strain rates induced by multiple laser shock waves. Corrosion tests in a chloride environment were carried out to determine resistance to localised attack, which was also verified on SEM/EDS. OCP transients confirmed an improved condition, that is, a more positive and stable potential after LSPwC treatment. Moreover, polarisation resistance of the LSPwC treated specimen was by a factor of 25 higher compared to the untreated specimen. Analysis of voltammograms confirmed an improved enhanced region of passivity and significantly smaller anodic current density of the LSPwC specimen compared to the untreated one. Through SEM, reduction of pitting attack at the LSPwC specimen surface was confirmed, despite its increased roughness.

Laser shock waves as a tool of changing the strains in materials

2000 ◽  
Vol 288 (2) ◽  
pp. 173-176 ◽  
Author(s):  
Y. Nikiforov ◽  
V. Yakovyna ◽  
N. Berchenko
Keyword(s):  
Shock Waves ◽  
Laser Shock

Optical brake induced by laser shock waves

2021 ◽  
pp. 2050010
Author(s):  
Qiao Kang ◽  
Dongyi Shen ◽  
Jie Sun ◽  
Xin Luo ◽  
Wei Liu ◽  
...  
Keyword(s):  
Shock Wave ◽  
Shock Waves ◽  
Optical Method ◽  
Close Contact ◽  
Surface Friction ◽  
Laser Shock ◽  
Free Standing ◽  
Friction Forces ◽  
Optical Levitation ◽  
Contact Surfaces

We demonstrate an optical method to modify friction forces between two close-contact surfaces through laser-induced shock waves, which can strongly enhance surface friction forces in a sandwiched confinement with/without lubricant, due to the increase of pressure arising from excited shock waves. Such enhanced friction can even lead to a rotating rotor’s braking effect. Meanwhile, this shock wave-modified friction force is found to decrease under a free-standing configuration. This technique of optically controllable friction may pave the way for applications in optical levitation, transportation, and microfluidics.

scholarly journals Microcracks, spall and fracture in glass: A study using short pulsed laser shock waves

1998 ◽  
Vol 83 (7) ◽  
pp. 3583-3594 ◽  
Author(s):  
Xin-Zen Li ◽  
M. Nakano ◽  
Y. Yamauchi ◽  
K. Kishida ◽  
K. A. Tanaka
Keyword(s):  
Shock Waves ◽  
Pulsed Laser ◽  
Laser Shock

Numerical Investigation of Opposing Dual Sided Micro Scale Laser Shock Peening

2006 ◽  
Author(s):  
Yajun Fan ◽  
Youneng Wang ◽  
Sinisa Vukelic ◽  
Y. Lawrence Yao
Keyword(s):  
Residual Stress ◽  
Shock Waves ◽  
Laser Shock Peening ◽  
Time Lags ◽  
Laser Shock ◽  
Surface Residual Stress ◽  
Strain Rate Effects ◽  
Micro Scale ◽  
Stress Profiles ◽  
Shock Peening

Laser shock peening (LSP) is an innovative process which imparts compressive residual stresses in the processed surface of metallic parts to significantly improve fatigue life and fatigue strength of this part. In opposing dual sided LSP, the workpiece can be simultaneously irradiated or irradiated with different time lags to create different surface residual stress patterns by virtue of the interaction between the opposing shock waves. In this work, a finite element model, in which the hydrodynamic behavior of the material and the deviatoric behavior including work hardening and strain rate effects were considered was applied to predict residual stress distributions in the processed surface induced under various conditions of the opposing dual sided micro scale laser shock peening. Thus the shock waves from each surface will interact in different ways through the thickness resulting in more complex residual stress profiles. Additionally, when treating a thin section, opposing dual sided peening is expected to avoid harmful effects such as spalling and fracture because the pressures on the opposite surfaces of the target balance one another and prohibit excessive deformation of the target. In order to better understand the wave-wave interactions under different conditions, the residual stress profiles corresponding to various workpiece thicknesses and various irradiation times were evaluated.

Characteristics of High Power Laser Shock Waves and Their Cleaning Performance

2019 ◽  
Vol 11 (2) ◽  
pp. 41-46 ◽  
Author(s):  
Tae-Gon Kim ◽  
Young-Sam Yoo ◽  
Il-Ryong Son ◽  
Deoksuk Jang ◽  
Dongsik Kim ◽  
...  
Keyword(s):  
Shock Waves ◽  
High Power ◽  
Laser Shock ◽  
High Power Laser ◽  
Power Laser ◽  
Cleaning Performance

Numerical Investigation of Opposing Dual Sided Microscale Laser Shock Peening

2006 ◽  
Vol 129 (2) ◽  
pp. 256-264 ◽  
Author(s):  
Yajun Fan ◽  
Youneng Wang ◽  
Sinisa Vukelic ◽  
Y. Lawrence Yao
Keyword(s):  
Residual Stress ◽  
Shock Waves ◽  
Element Model ◽  
Laser Shock Peening ◽  
Time Lags ◽  
Laser Shock ◽  
Surface Residual Stress ◽  
Strain Rate Effects ◽  
Stress Profiles ◽  
Shock Peening

Laser shock peening (LSP) is an innovative process which imparts compressive residual stresses in the processed surface of metallic parts to significantly improve fatigue life and fatigue strength of this part. In opposing dual sided LSP, the workpiece can be simultaneously irradiated or irradiated with different time lags to create different surface residual stress patterns by virtue of the interaction between the opposing shock waves. In this work, a finite element model, in which the hydrodynamic behavior of the material and the deviatoric behavior including work hardening and strain rate effects were considered, was applied to predict residual stress distributions in the processed surface induced under various conditions of the opposing dual sided microscale laser shock peening. Thus the shock waves from each surface will interact in different ways through the thickness resulting in more complex residual stress profiles. Additionally, when treating a thin section, opposing dual sided peening is expected to avoid harmful effects such as spalling and fracture because the pressures on the opposite surfaces of the target balance one another and prohibit excessive deformation of the target. In order to better understand the wave–wave interactions under different conditions, the residual stress profiles corresponding to various workpiece thicknesses and various irradiation times were evaluated.

Study of the Parameters of Laser-Induced Shock Waves for Laser Shock Peening of Silicon

JETP Letters ◽  
2020 ◽  
Vol 112 (11) ◽  
pp. 739-744
Author(s):  
E. I. Mareev ◽  
B. V. Rumiantsev ◽  
F. V. Potemkin
Keyword(s):  
Shock Waves ◽  
Laser Shock Peening ◽  
Laser Shock ◽  
Shock Peening
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