Transient temperature modeling and shock wave observation in confined laser ablation of thin molybdenum films

2013 ◽  
Author(s):  
Matthias Domke ◽  
Jürgen Sotrop ◽  
Stephan Rapp ◽  
Max Börger ◽  
Dominik Felsl ◽  
...  
Keyword(s):  
Shock Wave ◽  
Laser Ablation ◽  
Transient Temperature ◽  
Temperature Modeling ◽  
Wave Observation

Influence of preformed shock wave on the development of picosecond laser ablation plasma

2001 ◽  
Vol 89 (7) ◽  
pp. 4096-4098 ◽  
Author(s):  
Samuel S. Mao ◽  
Xianglei Mao ◽  
Ralph Greif ◽  
Richard E. Russo
Keyword(s):  
Shock Wave ◽  
Laser Ablation ◽  
Picosecond Laser ◽  
Ablation Plasma ◽  
Laser Ablation Plasma

Experimental investigation and numerical simulation on continuous wave laser ablation of multilayer carbon fiber composite

2015 ◽  
Vol 231 (8) ◽  
pp. 674-682 ◽  
Author(s):  
Lianchun Long ◽  
Yao Huang ◽  
Jinfeng Zhang
Keyword(s):  
Laser Ablation ◽  
Temperature Distribution ◽  
Carbon Fiber ◽  
Continuous Wave ◽  
Fiber Composite ◽  
Rear Surface ◽  
Peak Temperature ◽  
Transient Temperature ◽  
Carbon Fiber Composite ◽  
Carbon Fiber Epoxy

Laser beam machining is one of the most widely used advanced processing techniques, which can be applied to compound materials. As a large number of photons are absorbed into the composite, the subsequent local heat storage, charring and potential delamination make the study for the effect of laser on complex materials become significant. In this paper, a carbon fiber epoxy composite laminated sheet is irradiated by continuous wave chemical oxygen iodine laser. The peak temperature of front surface, the temperature distribution of rear surface, and the appearance of ablation zone are presented. Further, based on the birth–death elements technique of finite element method, a three-dimensional model for simulating the transient temperature distribution and material removal has been developed under the same condition. The results reveal that the peak temperature of irradiated region ranges from 2800 K to 3100 K, and the center point shows a higher temperature rise rate than the surroundings in the irradiated zone. The measured data and predicted data are in a good consistency, which suggests that the numerical model is appropriate for simulating laser ablation of carbon fiber epoxy composites.

Molecular Dynamics Study of Mechanism of Ablation Induced by a Femtosecond Laser Pulse

2003 ◽  
Author(s):  
Changrui Cheng ◽  
Xianfan Xu
Keyword(s):  
Molecular Dynamics ◽  
Laser Ablation ◽  
Laser Pulse ◽  
Femtosecond Laser ◽  
Critical Point ◽  
Change Process ◽  
Femtosecond Laser Ablation ◽  
Md Simulations ◽  
Femtosecond Laser Irradiation ◽  
Transient Temperature

In this work, molecular dynamics (MD) simulations are carried out to study femtosecond laser ablation of a metal, with an emphasis on the understanding of the mechanism of laser ablation. Theoretically, it has been shown that under intense femtosecond laser irradiation, the material can undergo a volumetric phase change process; its temperature can be close to or even above the critical point. MD simulations allow us to determine the transient temperature of the irradiated material as well as the transient thermodynamic state, which explain the mechanisms of femtosecond laser ablation.

Laser-launched flyer plate and confined laser ablation for shock wave loading: Validation and applications

2008 ◽  
Vol 79 (2) ◽  
pp. 023902 ◽  
Author(s):  
Dennis L. Paisley ◽  
Sheng-Nian Luo ◽  
Scott R. Greenfield ◽  
Aaron C. Koskelo
Keyword(s):  
Shock Wave ◽  
Laser Ablation ◽  
Shock Wave Loading ◽  
Wave Loading ◽  
Flyer Plate

Deburring Effect of Plasma Produced by Nanosecond Laser Ablation

2014 ◽  
Vol 136 (2) ◽  
Author(s):  
Yun Zhou ◽  
Yibo Gao ◽  
Benxin Wu ◽  
Sha Tao ◽  
Ze Liu
Keyword(s):  
Shock Wave ◽  
Laser Ablation ◽  
High Spatial Resolution ◽  
Shape Change ◽  
The Other ◽  
Nanosecond Laser ◽  
Laser Induced Plasma ◽  
Nanosecond Laser Ablation ◽  
Mechanical Breaking ◽  
The Sacrifice

This paper presents an interesting nanosecond (ns) laser-induced plasma deburring (LPD) effect (from microchannel sidewalls) discovered by the authors, which has been rarely reported before in the literature. Fast imagining study has been performed on plasma produced by ns laser ablation of the bottom of microchannels. It has been found that the plasma can effectively remove burrs from the sidewall of the channels, while on the other hand microscopic images taken in this study did not show any obvious size or shape change of the channel sidewall after LPD. LPD using a sacrifice plate has also been studied, where the plasma for deburring is generated by laser ablation of the sacrifice plate instead of the workpiece. The observed laser-induced plasma deburring effect has several potential advantages in practical micromanufacturing applications, such as high spatial resolution, noncontact and no tool wear, and less possibility of damaging or overmachining useful microfeatures when removing burrs from them. The fundamental mechanisms for the observed laser-induced plasma deburring effect still require lots of further work to completely understand, which may include mechanical breaking of burrs due to high kinetic energies carried by plasma and the associated shock wave, and/or thermal transport from plasma to burrs that may cause their heating and phase change, or other mechanisms.

Molecular Dynamics Study of Phase Change Mechanisms During Femtosecond Laser Ablation

2004 ◽  
Vol 126 (5) ◽  
pp. 727-734 ◽  
Author(s):  
Xianfan Xu ◽  
Changrui Cheng ◽  
Ihtesham H. Chowdhury
Keyword(s):  
Molecular Dynamics ◽  
Laser Ablation ◽  
Femtosecond Laser ◽  
Phase Change ◽  
Change Process ◽  
Femtosecond Laser Ablation ◽  
Femtosecond Laser Irradiation ◽  
Maximum Temperature ◽  
Transient Temperature ◽  
Phase Change Process

In this work, Molecular Dynamics (MD) simulation is employed to investigate femtosecond laser ablation of copper, with an emphasis on the understanding of the mechanism of phase change during laser ablation. Laser induced heat transfer, melting, surface evaporation, and material ablation are studied. Theoretically, it has been suggested that under intense femtosecond laser irradiation, the material undergoes a volumetric phase change process; its maximum temperature can be close to or even above the thermodynamic critical point. The MD simulations allow us to determine the transient temperature history of the irradiated material and to reveal the exact phase change process, which explains the mechanisms of femtosecond laser ablation. A finite difference calculation is also performed, which is used to compare results of heating and melting prior to a significant amount of material being ablated.

Excimer laser ablation of bone shock wave measurements and crater profiles

1996 ◽  
Vol 11 (1) ◽  
pp. 37-44 ◽  
Author(s):  
A. P. Sviridov ◽  
A. K. Dmitriev ◽  
A. D. Karoutis ◽  
P. Christodolou ◽  
E. Helidonis
Keyword(s):  
Shock Wave ◽  
Laser Ablation ◽  
Excimer Laser ◽  
Excimer Laser Ablation ◽  
Wave Measurements
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