An axisymmetric finite element solution for elastic wave propagation through threaded connections

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dc.contributor.authorLand, J. Georgeen
dc.contributor.committeecochairBatra, Romesh C.en
dc.contributor.committeecochairKriz, Ronald D.en
dc.contributor.committeememberHenneke, Edmund G. IIen
dc.contributor.departmentEngineering Mechanicsen
dc.date.accessioned2014-03-14T21:48:57Zen
dc.date.adate2008-11-07en
dc.date.available2014-03-14T21:48:57Zen
dc.date.issued1996-12-19en
dc.date.rdate2008-11-07en
dc.date.sdate2008-11-07en
dc.description.abstractAn axisymmetric finite element solution method is developed for axial wave propagation through a series of threaded connections in rock drills. A piston impacts axially on a string of rods held together by threaded joints and the wave propagates through these joints before reaching the bit. The energy lost in the joints limits the maximum effective depth of the drill. Several computational techniques are used to efficiently model the problem. Non-reflecting boundaries are used to numerically absorb the waves as they exit a joint. The stored waves are then re-initiated into the next joint eliminating modeling of the entire assembly of rods. The preload in the threads is modeled by shrinking the threaded sleeve onto the rods. A new dynamic relaxation damping scheme is used which starts with an undamped model and then increases the damping until the solution converges. This method converges more rapidly than the standard constant damping.en
dc.description.degreeMaster of Scienceen
dc.format.extentvii, 91 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-11072008-063025en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-11072008-063025/en
dc.identifier.urihttp://hdl.handle.net/10919/45443en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1996.L368.pdfen
dc.relation.isformatofOCLC# 36788927en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectthreadsen
dc.subjectwave propagationen
dc.subjectFinite element methoden
dc.subjectnon-reflecting boundariesen
dc.subjectrock drillen
dc.subject.lccLD5655.V855 1996.L368en
dc.titleAn axisymmetric finite element solution for elastic wave propagation through threaded connectionsen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineEngineering Mechanicsen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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