A Methodology For The Development Of A Coupling Model For High Energy Laser Interactions With Metals
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A Methodology For The Development Of A Coupling Model For High Energy Laser Interactions With Metals
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Author :
language : en
Publisher:
Release Date : 2006
A Methodology For The Development Of A Coupling Model For High Energy Laser Interactions With Metals written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.
Future Combat Systems are actively considering the use of a high-energy laser (HEL) for various missions. The laser of choice for this mission is likely to be a solid-state laser operating in the one micron wavelength region. Accordingly, lethality studies are underway to assess the utility of these HELs. The potential for dramatic increases in kill efficiency, as a function of various weapons parameters will be an important input to the selection and development of supporting technologies for an HEL weapon. Accordingly, the U.S. Army Space and Missile Defense Command (SMDC) is actively investigating the development of a model for the kill efficiency. This paper will report on the initial phase of this study and emphasizes the methodology for the development of a coupling model for materials of interest to the Army. Using continuous wave (CW) lasers operating at various powers and wavelengths as a source of data, a methodology is developed for inverting the non-linear partial differential equation solution for laser interaction with metals. Experimental studies of this laser interaction with metals has been performed using the 100kW CO2 Laser at the Laser Hardened Materials Evaluation Laboratory (LHMEL) and the 20 KW solid state fiber laser at the Air Force Research Laboratory located at Kirtland Air Force Base. These experiments included a variety of tests and extensive diagnostics operating at infrared and visible wavelengths. The methodology for developing a coupling model is derived analytically and comparison with experimental data is illustrated.
Multiscale Modeling And Simulation Of Laser Interaction With Metals
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Author : Pengfei Ji
language : en
Publisher:
Release Date : 2016
Multiscale Modeling And Simulation Of Laser Interaction With Metals written by Pengfei Ji and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
The electron temperature dependent electron heat capacity, electron thermal conductivity and effective electron-phonon coupling factor are modeled and computed on the basis of ab initio quantum mechanics (QM) calculation. The obtained electron thermophysical parameters are implemented into energy equation of electron subsystem in two temperature model (TTM). Upon laser irradiation on metal, energy transfer from the electron subsystem to the lattice subsystem is modeled by including electron thermophysical parameters in molecular dynamics (MD) and TTM coupled simulation. Phenomena, such as melting, layer-ablation, vaporization are found in the simulation results. In addition, bond hardening of femtosecond laser irradiated gold is observed. As the first work studying the laser interaction with metallic materials ranging from atomic scale to continuum scale, the successful construction of the QM-MD-TTM integrated simulation provides a general way that is accessible to other metals in laser heating. The simulation results highlight the promising application of the QM-MD-TTM integrated simulation. Obtained results from pure ab initio MD provide a better relation between microscopic processes and material response detected in experiments and serve for improved interpretation of experimental results on ultrafast laser-metal interactions. The results simulated and conclusion drawn will empower the multi-scale modeling of laser material interaction and be quite useful in helping to resolving the heat transfer and energy conversion problem during ultrashort laser processing of metals.
Laser Heating Of Metals
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Author : A. M. Prokhorov
language : en
Publisher: CRC Press
Release Date : 2018-01-31
Laser Heating Of Metals written by A. M. Prokhorov and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-01-31 with Science categories.
In order to ensure efficient use of lasers, and for any large-scale implementation, a thorough knowledge of the fundamental laws governing the interaction of radiation with matter is required. Laser Heating of Metals provides a systematic and comprehensive presentation of the fundamental principles underlying the physical and chemical mechanisms governing the interaction of laser radiation with solid targets, and in particular metals in gaseous environments, for a wide range of beam parameters. The authors have been active in the field of interactions between lasers and materials for many years, and this book summarises the results of their work, in particular concerning the action of CO2 lasers on metals. These results are then discussed at some length. Laser Heating of Materials will be of interest to scientists at all levels with an interest in the interaction of radiation with condensed matter, and in particular to those involved in laser cutting and welding etc, and metal-working.
The Theory Of Laser Materials Processing
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Author : John Dowden
language : en
Publisher: Springer
Release Date : 2017-06-16
The Theory Of Laser Materials Processing written by John Dowden and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-06-16 with Science categories.
The revised edition of this important reference volume presents an expanded overview of the analytical and numerical approaches employed when exploring and developing modern laser materials processing techniques. The book shows how general principles can be used to obtain insight into laser processes, whether derived from fundamental physical theory or from direct observation of experimental results. The book gives readers an understanding of the strengths and limitations of simple numerical and analytical models that can then be used as the starting-point for more elaborate models of specific practical, theoretical or commercial value. Following an introduction to the mathematical formulation of some relevant classes of physical ideas, the core of the book consists of chapters addressing key applications in detail: cutting, keyhole welding, drilling, arc and hybrid laser-arc welding, hardening, cladding and forming. The second edition includes a new a chapter on glass cutting with lasers, as employed in the display industry. A further addition is a chapter on meta-modelling, whose purpose is to construct fast, simple and reliable models based on appropriate sources of information. It then makes it easy to explore data visually and is a convenient interactive tool for scientists to improve the quality of their models and for developers when designing their processes. As in the first edition, the book ends with an updated introduction to comprehensive numerical simulation. Although the book focuses on laser interactions with materials, many of the principles and methods explored can be applied to thermal modelling in a variety of different fields and at different power levels. It is aimed principally however at academic and industrial researchers and developers in the field of laser technology.
Energy Coupling And Plume Dynamics During High Power Laser Heating Of Metals
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Author :
language : en
Publisher:
Release Date : 1997
Energy Coupling And Plume Dynamics During High Power Laser Heating Of Metals written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with categories.
High power laser heating of metals was studied utilizing experimental and numerical methods with an emphasis on the laser energy coupling with a target and on the dynamics of the laser generated vapor flow. Rigorous theoretical modeling of the heating, melting, and evaporation of metals due to laser radiation with a power density below the plasma shielding threshold was carried out. Experimentally, the probe beam deflection technique was utilized to measure the propagation of a laser induced shock wave. The effects of a cylindrical cavity in a metal surface on the laser energy coupling with a solid were investigated utilizing photothermal deflection measurements. A numerical calculation of target temperature and photothermal deflection was performed to compare with the measured results. Reflection of the heating laser beam inside the cavity was found to increase the photothermal deflection amplitude significantly and to enhance the overall energy coupling between a heating laser beam and a solid. Next, unsteady vaporization of metals due to nanosecond pulsed laser heating with an ambient gas at finite pressure was analyzed with a one dimensional thermal evaporation model for target heating and one dimensional compressible flow equations for inviscid fluid for the vapor flow. Lastly, the propagation of a shock wave during excimer laser heating of aluminum was measured with the probe beam deflection technique. The transit time of the shock wave was measured at the elevation of the probe beam above the target surface; these results were compared with the predicted behavior using ideal blast wave theory. The propagation of a gaseous material plume was also observed from the deflection of the probe beam at later times.
Technical Abstract Bulletin
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Author :
language : en
Publisher:
Release Date : 1979
Technical Abstract Bulletin written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with Science categories.
Analysis Of Laser Target Interaction Volume 1 Theory
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Author :
language : en
Publisher:
Release Date : 1979
Analysis Of Laser Target Interaction Volume 1 Theory written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with categories.
This work was divided into three areas: theoretical studies of pulsed laser interaction with metals; theoretical studies of the interaction of repetitively pulsed 10.6 micrometers lasers with dome materials; and first order concepts in the hardening of metals to repetitively pulsed radiation. Part I is devoted to theoretical studies of pulsed laser interaction with metals. The model for central thermal coupling to A12024 targets via plasma reradiation is improved by incorporating axial radiative transport within the plasma. The model is extended to include other metal alloy targets such as SS304, steel 4130 and Ti6Al4V. Based on absorbed fluence, a hierarchy is predicted for the metal targets. The model is also adapted to incorporate laser beams incident at oblique angles. The theory predicts substantial thermal and mechanical coupling at large angles of incidence, and the theoretical predictions are verified by the 1978 JANAF data. Part II deals with the interaction of pulsed 10.6 micrometers radiation with dome materials. First, theoretical models are advanced for the surface interaction of a pulsed laser with dome materials. A model is developed for repetitive pulse damage to fiberglass, based on delamination and the concept of a maximum amount of fluence per pulsed (called residual energy) which can be used to cause delamination.
Laser Additive Manufacturing
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Author : Milan Brandt
language : en
Publisher: Woodhead Publishing
Release Date : 2016-09-01
Laser Additive Manufacturing written by Milan Brandt and has been published by Woodhead Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-09-01 with Technology & Engineering categories.
Laser Additive Manufacturing: Materials, Design, Technologies, and Applications provides the latest information on this highly efficient method of layer-based manufacturing using metals, plastics, or composite materials. The technology is particularly suitable for the production of complex components with high precision for a range of industries, including aerospace, automotive, and medical engineering. This book provides a comprehensive review of the technology and its range of applications. Part One looks at materials suitable for laser AM processes, with Part Two discussing design strategies for AM. Parts Three and Four review the most widely-used AM technique, powder bed fusion (PBF) and discuss other AM techniques, such as directed energy deposition, sheet lamination, jetting techniques, extrusion techniques, and vat photopolymerization. The final section explores the range of applications of laser AM. Provides a comprehensive one-volume overview of advances in laser additive manufacturing Presents detailed coverage of the latest techniques used for laser additive manufacturing Reviews both established and emerging areas of application
Energy Coupling And Plume Dynamics During High Power Laser Heating Of Metals
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Author : Sungho Jeong
language : en
Publisher:
Release Date : 1997
Energy Coupling And Plume Dynamics During High Power Laser Heating Of Metals written by Sungho Jeong and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with categories.
Fundamentals Of Laser Powder Bed Fusion Of Metals
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Author : Igor Yadroitsev
language : en
Publisher: Elsevier
Release Date : 2021-05-23
Fundamentals Of Laser Powder Bed Fusion Of Metals written by Igor Yadroitsev and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-05-23 with Technology & Engineering categories.
Laser powder bed fusion of metals is a technology that makes use of a laser beam to selectively melt metal powder layer-by-layer in order to fabricate complex geometries in high performance materials. The technology is currently transforming aerospace and biomedical manufacturing and its adoption is widening into other industries as well, including automotive, energy, and traditional manufacturing. With an increase in design freedom brought to bear by additive manufacturing, new opportunities are emerging for designs not possible previously and in material systems that now provide sufficient performance to be qualified in end-use mission-critical applications. After decades of research and development, laser powder bed fusion is now enabling a new era of digitally driven manufacturing. Fundamentals of Laser Powder Bed Fusion of Metals will provide the fundamental principles in a broad range of topics relating to metal laser powder bed fusion. The target audience includes new users, focusing on graduate and undergraduate students; however, this book can also serve as a reference for experienced users as well, including senior researchers and engineers in industry. The current best practices are discussed in detail, as well as the limitations, challenges, and potential research and commercial opportunities moving forward. Presents laser powder bed fusion fundamentals, as well as their inherent challenges Provides an up-to-date summary of this advancing technology and its potential Provides a comprehensive textbook for universities, as well as a reference for industry Acts as quick-reference guide