Last edited by Shakajar
Monday, July 27, 2020 | History

4 edition of Thermohydrodynamic Models of Laser Irradiation of Metals found in the catalog.

Thermohydrodynamic Models of Laser Irradiation of Metals

by R. Arutyunian

  • 133 Want to read
  • 28 Currently reading

Published by Routledge .
Written in English

    Subjects:
  • Laser technology,
  • Optics (light),
  • Thermochemistry & chemical thermodynamics,
  • Science / Physics,
  • Physics,
  • Science,
  • Science/Mathematics

  • Edition Notes

    SeriesSoviet Technology Reviews Series, Section B
    The Physical Object
    FormatHardcover
    Number of Pages174
    ID Numbers
    Open LibraryOL12860281M
    ISBN 103718650711
    ISBN 109783718650712

    Laser induced chemical and physical modifications of polymer films: dependence on the irradiation wavelength T. Lippert a,), T. Nakamura b, H. Niino b, A. Yabe b a Los Alamos National Laboratory, MS J , Los Alamos, NM , USA b National Institute of Materials and Chemical Research, Tsukuba, Ibaraki , Japan Received 5 June METALS, CERAMICS, AND OTHER {sub 4} laser beam, using a pulse to pulse overlap of 40%. By varying the number of laser scans N{sub s} = 1, 2, 5, 10, 20, 40 at constant pulse energy density H = J/cm{sup 2} and H multicomponent thermohydrodynamic computer codes is the detailed study of hypothetical core disruptive accidents (HCDAs) in.

    Laser-induced breakdown spectroscopy (LIBS) is a laser based diagnostics used to study atomic emission from the expanding plasma plume formed during the laser-matter interaction. It provides valuable information about the composition of the target material. LIBS has proved its potential application in the analysis of impurities, pollutantsCited by: 1. Laser exposure time, t e [µs] 70 Effective scan speed, SS [mm/s] Laser Diameter, D [µm] Optical penetration depth, d [µm] 50 Reflectance of SSL, R Number of laser tracks, N 5 Thermal Properties The thermal properties of solid L stainless steel are temperaturedependent and - identified in Ref. [10].File Size: 1MB.

      The two temperature coupled equations, modeling thermal diffusion during laser-induced ablation of metals, are solved under the assumptions that the electron and the lattice heat capacities, and the thermal conductivity remain constant in the process. In view of its practical value, the solution is initially obtained for the energy sources with a Gaussian by: 5. irradiation whose magnitude depends upon the molar ab- sorptivity of the species, the amount of species generated, and the thermal properties of the system. In this paper we present a theoretical model of the PTS effect and describe the application of PTS to studies of films (dyes and paints) on metal foil substrates as well as electro-.


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Thermohydrodynamic Models of Laser Irradiation of Metals by R. Arutyunian Download PDF EPUB FB2

This chapter provides an overview of the modeling of the nucleation temperature for alloys in the Cu–Ti system under laser irradiation conditions. Alloys of composition in the vicinity of a deep eutectic are expected to crystallize from the melt in the form of a multiphase structure, particularly if the T O curves of the phases involved do Cited by: 1.

[18]. Finite element models and studies of these two effects on PMMA suggest pit formation and the high velocity ejection of monomer gases upon irradiation from either source.

Because the material reacts to the laser photothermally, it is assumed here that the laser can be modeled as a Gaussian heat flux at the irradiation surface.

The. High power density, such as laser beam, has been increasingly utilized in industrial manufacturing. The process of laser beam in solid material offers a great potential for the new product design, for example, welding, cutting of metals, drilling of holes, laser shock hardening and laser glazing.

When a high power laser. The damage was investigated using shock waves induced by a short‐pulsed laser in copper and aluminum foils. Laser irradiation intensities were in the range of 10 10 –10 12 W/cm 2.

The foil thickness was in the –‐μm range. The ablation pressure attained on the front surface of targets was a few hundred by: In the case of irradiation damage, dislocations also interact with defect clusters whose density in bcc metals can be of the order of 10 24 m −3 for a variety of neutron irradiated metals near room temperature.

In bcc metals, defects are Frank-Sessile (FS) dislocation loops of the type {1 0 0}, Burgers vector of the type 〈1 0 0〉, and the Cited by: Download Citation | Temperature-Dependent Reflectance of Plated Metals and Composite Materials Under Laser Irradiation | Experiments were performed to investigate laser-heating-induced changes in.

Molecular dynamics studies of ultrafast laser-induced nonthermal melting Fig. 2 Snapshots of atomic distributions of (a) laser heating with absorbed laser fluence of J/m2 and (b) nonthermal melting triggered by coherent phonon excitation, corresponding to absorbed fluence J/m2 E =AF tCited by: 6.

The irradiation model analyses the laser radiation transmitted to the sample plane. The input of the model considers parameters of the laser source, optical and kinematical system. The output of the model is the fluence accumulation process in the irradiation plane. A detailed description of the irradiation model.

Modeling Microstructure and Irradiation Effects Article (PDF Available) in Metallurgical and Materials Transactions A 42(4) April with Reads How we measure 'reads'.

We investigated the ability of mathematical models to predict temperature rises in biological tissue during laser irradiation by comparing calculated values with experimental measurements.

Samples of normal human aorta, beef myocardium, and polyacrylamide gel were irradiated in air with an argon laser beam, while surface temperatures were monitored with an IR camera. 5 contents abstract 6 list of papers 7 1.

introduction 9 2. biological basis of heat treatment 12 hyperthermia 12 hyperthermia in conjunction with photodynamic therapy 19 coagulation 21 vaporisation 24 3. induction methods for heat treatment 25 microwaves 25 laser light 27 light-tissue interaction 27 measurement of optical properties of tissue manufacturing of metallic parts.

Processes using laser as the power source, including selective laser sintering (SLS) an d selective laser melting (SLM), which utili]e a KigK SoZered laser to ³selectively´ fuse Paterial SoZder according to the CAD model, layer by layer, into a three dimensional part, is the predominant process in by: 1.

An approach to the mathematical analysis of ordered relief arising on the surface of heat-resistant steel 15Kh13MF after laser shock-wave treatment allowing one to obtain the quantitative and qualitative evaluation of the roughness parameters while taking into account the stochastic and the cyclical nature of the process is by: 7.

shorter laser pulse duration is, the larger the difference between their model and the TTM is. In this paper, we derive an electrohydrodynamics (EHD) model based on the coupled electron and phonon BTE to investigate the electron and phonon transport in metals after the ultra-short pulse laser heating.

In this model, the energy current is driven. The incident high energy laser beam is modeled as a Gaussian heat flux. The beam parameters used for this study were selected to mimic that of a Nd:YAG high energy laser with a wavelength of nm, an output power of W, and a spot size with a mm beam diameter.

T1 - Modeling optical and thermal distributions in tissue during laser irradiation. AU - Jacques, Steven L. AU - Prahl, Scott A. PY - Y1 - N2 - The propagation of light energy in tissues is an important problem in phototherapy, especially with Cited by: The laser chemical machining is a non-conventional substractive processing method.

It is based on the laser-activation of a material dissolution of metals in electrolyte ambient via local-induced temperature gradients and allows a gentle and smooth processing of especially temperature-sensitive metals.

However, the material removal is characterized by a narrow process window Cited by: 2. The effect of preliminary treatment by low-energy laser radiation pulses on the melting of aluminum alloys is studied.

Preliminary irradiation of alloys is shown to change the time of beginning of melting during the subsequent laser irradiation at an energy higher than a Cited by: 3.

To grind fused silica in ductile mode, it was proposed to repair surface and subsurface micro cracks of fused silica by CO2 laser irradiation. However, excessive residual stress remains on the surface because the melt fused silica on the surface quenches in air.

It causes the critical depth of cut for ductile grinding fused silica to be smaller than : Run Qiang Li, Peng Yao, Hao Meng, Jun Wang, Ke Zhang, Chuan Zhen Huang, Bin Zou, Han Lian Liu. The influence of irradiation temperature and displacement rate on point defect cluster formation has been investigated using a kinetic model.

The model considers both interstitial and vacancy clustering; the former are treated as Frank loops and the latter as by: 8. Steel 30CrMnSiNi2A slices were irradiated by a continuous wave fiber laser beam with the intensity of W/cm2.

Alloy samples with various temperature processes were obtained by changing the laser irradiation time, irradiation times and atmosphere environment. X-ray diffraction, scanning electron microscope, energy dispersive spectrometer and Author: Tao Tao Wu, Li Jun Wang, Cheng Hua Wei, Chun Xu Pan, Lin Zhu Chen, Zhi Liang Ma.ultrafast laser irradiation.

With the mutual verification and promotion of experiments and theories, research on micro/nano non-equilibrium heat transport in metals has become very mature today. However, few people have conducted research on nano heat transport in semiconductors and super-lattices, a large class of materials.T.

Vaculovic et al.ˇ Laser-Induced Breakdown Spectroscopy of Molten Metals interferences. The content of chromium, copper, man-ganese, lead, zinc, tin, magnesium, iron, and nickel were determined.

3. Results and Discussion Influence of Temperature on LIP Intensity The first experiments performed with the new setup.