scholarly journals Numerical simulation of Ne-like Ar plasma dynamics and laser beam characteristics of 46.9 nm laser excited by capillary discharge

AIP Advances ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 105113
Author(s):  
Muhammad Usman Khan ◽  
Yongpeng Zhao ◽  
Dongdi Zhao ◽  
Huaiyu Cui ◽  
Ziyue Cao ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Laser Beam ◽  
Capillary Discharge ◽  
Plasma Dynamics ◽  
Ar Plasma ◽  
Beam Characteristics

scholarly journals Numerical Simulation of Ni-Like Xe-Plasma Dynamics and Laser Gain in a Low-Inductive Capillary Discharge

2020 ◽  
Vol 41 (4) ◽  
pp. 424-433
Author(s):  
I. A. Artyukov ◽  
V. A. Burtsev ◽  
R. M. Feshchenko ◽  
N. V. Kalinin
Keyword(s):  
Numerical Simulation ◽  
Capillary Discharge ◽  
Plasma Dynamics ◽  
Laser Gain

Numerical Simulation on Temperature Field in Multi-Layers Inside-Beam Powder Feeding when Laser Cladding

2012 ◽  
Vol 499 ◽  
pp. 114-119 ◽  
Author(s):  
Ming Di Wang ◽  
Shi Hong Shi ◽  
X.B. Liu ◽  
Cheng Fa Song ◽  
Li Ning Sun
Keyword(s):  
Numerical Simulation ◽  
Heat Source ◽  
Laser Beam ◽  
Cooling Rate ◽  
Light Source ◽  
Laser Cladding ◽  
Laser Scanning ◽  
Initial Conditions ◽  
Cladding Layer ◽  
Powder Feeding

Numerical simulation of laser cladding is the main research topics for many universities and academes, but all researchers used the Gaussian laser light source. Due to using inside-beam powder feeding for laser cladding, the laser is dispersed by the cone-shaped mirror, and then be focused by the annular mirror, the laser can be assumed as the light source of uniform intensity.In this paper,the temperature of powder during landing selected as the initial conditions, and adopting the life-and-death unit method, the moving point heat source and the uniform heat source are realized. In the thickness direction, using the small melt layer stacking method, a finite element model has been established, and layer unit is acted layer by layer, then a virtual reality laser cladding manu-facturing process is simulated. Calculated results show that the surface temperature of the cladding layer depends on the laser scanning speed, powder feed rate, defocus distance. As cladding layers increases, due to the heat conduction into the base too late, bath temperature will gradually increase. The highest temperature is not at the laser beam, but at the later point of the laser beam. In the clad-ding process, the temperature cooling rate of the cladding layer in high temperature section is great, and in the low-temperature, cooling rate is relatively small. These conclusions are also similar with the normal laser cladding. Finally, some experiments validate the simulation results. The trends of simulating temperature are fit to the actual temperature, and the temperature gradient can also ex-plain the actual shape of cross-section.

Coupled electric fields in photorefractive driven liquid crystal hybrid cells – theory and numerical simulation

2016 ◽  
Vol 24 (4) ◽  
Author(s):  
P. Moszczyński ◽  
A. Walczak ◽  
P. Marciniak
Keyword(s):  
Numerical Simulation ◽  
Laser Beam ◽  
Electric Fields ◽  
Cell Response ◽  
Liquid Crystalline ◽  
Driving Field ◽  
Self Organized ◽  
Photosensitive Polymer ◽  
Photosensitive Layer ◽  
External Driving

AbstractIn cyclic articles previously published we described and analysed self-organized light fibres inside a liquid crystalline (LC) cell contained photosensitive polymer (PP) layer. Such asymmetric LC cell we call a hybrid LC cell. Light fibre arises along a laser beam path directed in plane of an LC cell. It means that a laser beam is parallel to photosensitive layer. We observed the asymmetric LC cell response on an external driving field polarization. Observation has been done for an AC field first. It is the reason we decided to carry out a detailed research for a DC driving field to obtain an LC cell response step by step. The properly prepared LC cell has been built with an isolating layer and garbage ions deletion. We proved by means of a physical model, as well as a numerical simulation that LC asymmetric response strongly depends on junction barriers between PP and LC layers. New parametric model for a junction barrier on PP/LC boundary has been proposed. Such model is very useful because of lack of proper conductivity and charge carriers of band structure data on LC material.

scholarly journals Laser beam coupling with capillary discharge plasma for laser wakefield acceleration applications

2017 ◽  
Vol 24 (8) ◽  
pp. 083109 ◽  
Author(s):  
G. A. Bagdasarov ◽  
P. V. Sasorov ◽  
V. A. Gasilov ◽  
A. S. Boldarev ◽  
O. G. Olkhovskaya ◽  
...  
Keyword(s):  
Laser Beam ◽  
Discharge Plasma ◽  
Capillary Discharge ◽  
Laser Wakefield Acceleration ◽  
Wakefield Acceleration ◽  
Beam Coupling ◽  
Laser Wakefield

Automated heat source calibration for the numerical simulation of laser beam welded components

2016 ◽  
Vol 10 (2) ◽  
pp. 129-136 ◽  
Author(s):  
A. Belitzki ◽  
C. Marder ◽  
A. Huissel ◽  
M. F. Zaeh
Keyword(s):  
Numerical Simulation ◽  
Heat Source ◽  
Laser Beam

scholarly journals Steel Sheets Laser Lap Joint Welding—Process Analysis

Materials ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2258 ◽  
Author(s):  
Hubert Danielewski ◽  
Andrzej Skrzypczyk
Keyword(s):  
Numerical Simulation ◽  
Laser Beam ◽  
Steel Sheet ◽  
Process Analysis ◽  
Welding Process ◽  
Parameters Estimation ◽  
Welding Parameters ◽  
Lap Joint ◽  
Beam Radiation ◽  
Keyhole Effect

This article presents the results of steel-sheet lap-joint-welding using laser beam radiation. The use of a laser beam and keyhole effect for deep material penetration in lap joint welding was presented. Thermodynamic mechanism of laser welding is related to material properties and process parameters. Estimation of welding parameters and joint properties’ analysis was performed through numerical simulation. The article presents a possibility of modeling laser lap-joint welding by using Simufact Welding software based on Marc solver and thermo-mechanical solution. Numerical calculation was performed for surface and conical volumetric heat sources simulating laser absorption and keyhole effect during steel sheet welding. Thermo-mechanical results of fusion zone (FZ), heat-affected zone (HAZ) and phase transformations calculated in numerical simulation were analyzed. The welding parameters for partial sealed joint penetration dedicated for gas piping installations were estimated from the numerical analysis. Low-carbon constructional steel was used for numerical and experimental analyses. A trial joint based on the estimated parameters was prepared by using a CO2 laser. Numerical and experimental results in the form of hardness distributions and weld geometry were compared. Metallographic analysis of the obtained weld was presented, including crystallographic structures and inclusions in the cross section of the joint.

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