Tesis sobre el tema "Through transmission laser welding"
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Ramachandramoorthy, Rajaprakash. "Laser transmission welding of themoplastic tubes and plates using laser refraction". Thesis, McGill University, 2012. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=106395.
Texto completoLe soudage par transmission laser est une méthode pour joindre les plastiques qui prend avantage du fait que la majorité des thermoplastiques sont transparent aux infrarouges. Durant le procédé, un faisceau laser passe à travers une région transparente pour aller en frapper une autre rendue absorbante au moyen d'additifs tel que le noir de carbone. L'énergie laser absorbée est ensuite convertie en chaleur. Ce dégagement de chaleur permet de souder l'interface entre les deux parties en fondant le polymère. Dans le présent travail, une nouvelle technique de soudage par transmission laser basée sur la réfraction a été utilisée pour souder des plaques de nylon à des tubes de nylon contenant du noir de carbone. Afin de réfracter le laser, une surface en angle a été usinée à même les plaques de nylon transparentes, près de l'interface de soudage. Les effets de différentes propriétés du laser telles que la vitesse, le nombre de rotations et la puissance ont été évalués en se basant sur la qualité du soudage en termes du fini et de la résistance aux contraintes. La résistance des soudures a été déterminée à l'aide d'un nouvel accessoire de test en traction. Ensuite, la largeur de la soudure a été mesurée sur les échantillons testés en traction à l'aide d'un pied à coulisse et de la microscopie par transmission de lumière. Pour obtenir la contrainte en traction, les résultats des tests en traction ont été normalisés en les divisant par la surface réelle de leur soudure. Les résultats démontrent qu'une augmentation de la puissance et de la rotation du laser, jusqu'au seuil de dégradation, permet aux échantillons de soutenir davantage de contraintes en traction. De plus, les changements dans les propriétés du matériel dus à la soudure ont été caractérisés à l'aide d'un nano-indenteur, pour lequel de petits échantillons carrés ont été extraits de l'interface de soudure et montés à froid. Les résultats démontrent que le module et la dureté du nylon diminuent à l'interface de soudure. Puisque la diminution du module dans les polymères semi-cristallins est habituellement associée à une diminution de cristallinité, la calorimétrie différentielle à balayage a été utilisée afin de déceler les possibles changements dans la cristallinité. Les résultats confirment en effet que la cristallinité diminue à l'interface de soudure, et expliquent donc, par le fait même, la diminution des propriétés mécaniques.
Boglea, Andrei [Verfasser]. "Laser Transmission Welding of Thermoplastics Using Local Laser Beam Modulation / Andrei Boglea". Aachen : Shaker, 2013. http://d-nb.info/1050345991/34.
Texto completoNo, Donghun. "A study of the combined socket and butt welding of plastic pipes using through transmission infrared welding". The Ohio State University, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=osu1104437266.
Texto completoNo, Dong Hun. "A study of the combined socket and butt welding of plastic pipes using through transmission infrared welding". Connect to this title online, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1104437266.
Texto completoTitle from first page of PDF file. Document formatted into pages; contains xxi, 221 p.; also includes graphics (some col.) Includes bibliographical references (p. 218-221).
Bahrami, Amir. "Carbon nanotubes as near infrared laser susceptors". Thesis, University of Cambridge, 2011. https://www.repository.cam.ac.uk/handle/1810/230112.
Texto completoKennedy, Christopher. "Properties of High Energy Laser Light Transmission through Large Core Optical Cables". Master's thesis, University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5797.
Texto completoM.S.
Masters
Optics and Photonics
Optics and Photonics
Optics
Paleocrassas, Alexander Grant. "Feasibility Investigation of Laser Welding Aluminum Alloy 7075-T6 through the use of a 300 W, Single-Mode, Ytterbium Fiber Optic Laser". NCSU, 2005. http://www.lib.ncsu.edu/theses/available/etd-08062005-173047/.
Texto completoNoori, Rahim Abadi Seyyed Mohammad Ali. "Investigation of Melt Pool Thermo-hydrodynamic Behaviour inLaser Beam Welding ofTi-6Al-4V through Numerical Simulation". Licentiate thesis, Högskolan Väst, Avdelningen för svetsteknologi (SV), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-17410.
Texto completoLaser är en effektiv och allmänt använd värmekälla vid svetsning och additiv tillverkning. Den har några viktiga fördelar jämfört med andra konventionella värmekällor såsom elektronstråle och elektrisk ljusbåge, nämligen: den kan ofta användas till komplicerade svetsgeometrier, och den kan producera stora komponenter. Lasersvetsning involverar olika sammansatta fysikaliska fenomen såsom värmeöverföring, metallsmältning, flöde, stelning, ytdeformation, avdunstning och i vissa fall förångning. Syftet med mitt forskningsarbete är tvåfaldigt: att få en djupare processförståelse och att förbättra modellens tillförlitlighet. Fördjupad processförståelse eftersträvades för att förstå hur formen på laserstrålen påverkar svetssmältan. För att uppnå förbättrad modellsäkerhet behövs experimentella data av hög kvalitet som representerar processen. Således utfördes 3D-validering av smältgeometrin medan det vanligtvis var 2D i tidigare forskningsarbeten. Dessutom har en ny modell för laserabsorption föreslagits. I forskningen har numerisk strömningssimulering (Computational Fluid Dynamics) använts för att simulera processen och en numerisk lösare, som kan spåra deformationen av den rörliga smälta ytan, är utveckladi programvaran OpenFOAM. Beträffande laserstrålens utbredning visar resultaten att svetssmältans storlek och även svetssmältansflöde modifieras genom att laserstråleformen förlängs. Medan den förra är känd från tidigare experimentella studier upptäcktes den senare inte före denna studie eftersomdet icke-transparenta mediet hindrar optisk observation. Nya (in-process) kvantitativa mätningar utförda av en projektpartner har använts för att testa modellerna. Svagheter i den tidigare absorptionsmodellen framhävdes, liksom begränsningarna i den föreslagna modellen. Slutligen visade resultaten att den föreslagna modellen där laserabsorptionen är en funktion av lokala ytförhållanden ledde till en bättre overensstämmelse med mätningar jämfört med den tidigare modellen med konstant laserabsorbtion. Den maximala avvikelsen jämfört med experimentell mätning, som observerades med avseende på smältbassängsdjupet, kunde reduceras till cirka 10%.
Till licentiatuppsats hör 2 inskickade artiklar, som inte visas nu.
Litera, Jan. "Analýza vlivu přesahu na pevnost svarového spoje součásti z kompozitu". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-418210.
Texto completoCao, Xiaochao. "WELD READ-THROUGH DEFECTS IN LASER TRANSMISSION WELDING". Thesis, 2010. http://hdl.handle.net/1974/5916.
Texto completoThesis (Master, Chemical Engineering) -- Queen's University, 2010-07-02 14:34:41.201
CHEN, Mingliang. "Gap Bridging in Laser Transmission Welding of Thermoplastics". Thesis, 2009. http://hdl.handle.net/1974/5220.
Texto completoThesis (Ph.D, Mechanical and Materials Engineering) -- Queen's University, 2009-09-24 22:24:11.734
KHOSRAVI, SINA. "LASER TRANSMISSION WELDING OF POLYBUTYLENE TEREPHTHALATE AND POLYETHYLENE TEREPHTHALATE BLENDS". Thesis, 2010. http://hdl.handle.net/1974/6005.
Texto completoThesis (Master, Chemical Engineering) -- Queen's University, 2010-08-31 10:03:42.167
Okoro, TASIE B. "THERMAL DEGRADATION OF PC AND PA6 DURING LASER TRANSMISSION WELDING (LTW)". Thesis, 2013. http://hdl.handle.net/1974/8340.
Texto completoThesis (Master, Chemical Engineering) -- Queen's University, 2013-09-27 10:45:24.688
Mayboudi, LAYLA S. "Heat Transfer Modelling and Thermal Imaging Experiments in Laser Transmission Welding of Thermoplastics". Thesis, 2008. http://hdl.handle.net/1974/1551.
Texto completoThesis (Ph.D, Mechanical and Materials Engineering) -- Queen's University, 2008-10-08 10:39:30.952
Chen, Tenn Francis. "Bulk Scattering Approximations for Collimated Light Transmitted through Paper". Thesis, 2009. http://hdl.handle.net/10012/4207.
Texto completoLiang, Daniel y 梁信智. "Time-dependent Phenomena Affected by Ar+ Laser Light Transmission through Barium Titanate Crystal". Thesis, 2006. http://ndltd.ncl.edu.tw/handle/87512516909638247660.
Texto completo中原大學
應用物理研究所
94
For the purposes of mass information storage and optical image processing, photorefraction is a useful property of optical material. Among many materials with this property, Barium Titanate crystal has been well studied and widely applied in optical computing, hologram storage, etc., so it is important to know the optical behavior of Barium Titanate. Of particular interest is the response of the crystal to incident laser light. We used polarized Argon ion laser as the probe to investigate the mechanism of Barium Titanate’s response to the incident laser light. Several interesting phenomena were discovered. First, the transmitted Argon laser light intensity oscillated along with time after passing through a 45∘cut-BaTiO3 and an analyzer. The amplitude of oscillation also varied with time. Second, contrary to theoretical expectation, when the polarization is along the ordinary index direction and extra-ordinary direction (i.e., the eigen-direction of the light propagation), we found the transmitted light still oscillated. Third, when a He-Ne laser probe beam passes through the pumping (heating) argon-laser beam spot, the He-Ne laser light intensity oscillates alternatively between a high peak and a low peak, in contrast with the opposite case where the He-Ne laser beam doesn’t go through the heating spot, the intensity oscillates without alternating hi-lo peaks. Fourth, after removing the analyzer, the transmitted light intensity raises to a peak then drops rapidly with a dip and then gradually recovers to a level intensity. This observation is called “spike phenomenon” in this thesis. In order to understand how the dip takes place, we studied the influence of beam fanning, scattering ring, and other scattering processes using an integration sphere to integrate all the non-transmitted light. In the next paragraph, possible explanations for the above observations are offered. The oscillation of transmitted light intensity can be attributed to the temperature dependence of extra-ordinary refractive index. This useful property can be used to study the heat conduction rate of Barium Titanate. Actual results show that the envelope of oscillation was also varying with time. This variation can be attributed to the temperature dependence of the absorption coefficients, as confirmed by our simulation results. For the oscillation for the light when polarization is along the eigen-direction, we suggest that it may be linked to the induced optical activity of BaTiO3. Also the differential absorption coefficients of ordinary refractive index and extra-ordinary index may change the light polarization to an elliptical one and hence offer a possible explanation to the oscillation of alternating hi-lo peaks for the probing He-Ne laser beam. As far as the “spike phenomenon”, the first possible explanation is absorption and re-absorption of deep and shallow impurity levels. Additional mechanisms such as beam fanning, the scattering effect or a combination of the above is also a possible cause of the “spike phenomena”. This assertion is based on the experiment using integrating sphere to integrate all the non-transmitted light, which shows that the sum of fanning and scattering intensity can just make up the lost of the dip. Thus, the “Spike Phenomena” is most likely caused by the combination of absorption, fanning effect and scattering effect.
Wang, Sheng-ho y 王聖禾. "A Novel Scheme of LPOF by Jointing an Aspheric Plastic Lens and a Plastic Fiber Using Laser Transmission Welding". Thesis, 2006. http://ndltd.ncl.edu.tw/handle/30328012639786823793.
Texto completo國立中山大學
機械與機電工程學系研究所
94
A novel lensed plastic optical fiber (LPOF) scheme to achieve the high coupling efficiency with a long working distance between the light source and LPOF is proposed. The advantages of the proposed LPOF are demonstrated by proofs of the experiment. In this study, an aspheric convex-concave plastic lens (CCPLs) is bonded with a flattened end of the plastic fiber by using the laser transmission welding (LTW) to form an aspheric-endface fiber. The working distance between the light source and LPOF can be increased with high coupling efficiency by the design of the CCPLs. According to the proposed design in this study, the working distance and the coupling efficiency can reach to 300μm and 80%, separately. Furthermore, the analysis shows that the LTW can achieve a high welding strength and a small heat affected zone that meets the commercial utilization. But the LTW technology has some restrictions, the disadvantages of the LTW technology are improved in this study to spread the application of the laser welding.