Heat transfer during pulsed laser cutting of thin sheets

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dc.contributor.authorLindau, Jules Washingtonen
dc.contributor.committeechairDiller, Thomas E.en
dc.contributor.committeememberKnight, Charles E.en
dc.contributor.committeememberVick, Brian L.en
dc.contributor.departmentMechanical Engineeringen
dc.date.accessioned2014-03-14T21:28:43Zen
dc.date.adate2013-02-06en
dc.date.available2014-03-14T21:28:43Zen
dc.date.issued1989-05-05en
dc.date.rdate2013-02-06en
dc.date.sdate2013-02-06en
dc.description.abstractA numerical model of the temperature field during pulsed laser cutting of thin sheets (approximately 2.5 x l0⁻⁵ m) was developed. Cutting was simulated through removal of nodes from a finite difference scheme based on sensible heating to the phase change temperature and a single value of latent heat (melting or vaporization). The pulsed laser model predicts a heat-affected zone of less than 0.02 mm for pulsed laser cutting. For comparable cutting with a continuous power laser, a heat-affected zone between 0.05 and 0.10 mm is predicted. Thermal stress levels were predicted to be an order of magnitude lower for pulsed laser cutting than for continuous power cutting. The stress levels predicted by the model also increased with cut speed. Experimentally, pulsed laser cutting yielded better cut quality, based on less cracking, than continuous power cutting. In addition, the cut quality deteriorated as the cutting speed was increased for the continuous power laser. Presently, application of pulsed laser cutting is limited by its low cutting speed, which is restricted by the energy density of the laser. The model predicts that increasing energy density will decrease the size of the heat-affected zone and increase the maximum cutting speed. Therefore, pulsed laser cutting at high speeds should be attainable without deterioration in cut quality.en
dc.description.degreeMaster of Scienceen
dc.format.extentxi, 74 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-02062013-040225en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-02062013-040225/en
dc.identifier.urihttp://hdl.handle.net/10919/40958en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1989.L564.pdfen
dc.relation.isformatofOCLC# 20432621en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1989.L564en
dc.subject.lcshLaser beam cuttingen
dc.subject.lcshLaser pulses, Ultrashorten
dc.titleHeat transfer during pulsed laser cutting of thin sheetsen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineMechanical Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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