The performance of high speed reciprocating polymer seals in water

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dc.contributor.advisorMartin, J Ben_ZA
dc.contributor.authorBarnes, Jonathan Jamesen_ZA
dc.date.accessioned2016-03-28T14:38:33Z
dc.date.available2016-03-28T14:38:33Z
dc.date.issued1991en_ZA
dc.descriptionBibliography: pages 93-94.en_ZA
dc.description.abstractThe elastohydrodynamic lubrication of polymeric piston seals in a water powered rockdrill has been modelled in this thesis. Current seal designs, consist of an Ultra High Molecular Weight Polyethylene (UHMWPE) ring, energised to remain in contact with the reciprocating piston, using a nitrile rubber o-ring. The design of the seals is such that they do not facilitate the formation of a lubricating film, and the high contact stresses at the seal face due to the seal pressure cause excessive wear of the seals. The elastohydrodynamic model is based on a numerical algorithm in which the elasticity equations for the seal deflection and the one dimensional lubrication equation have been solved simultaneously. The polymeric ring has been simplified due to its axisymmetry, and modelled in cross section as an elastic beam resting on a spring base, while the deformation of the o-ring has been considered independently since the moduli of the two materials differs by nearly two orders of magnitude. The o-ring was modelled using the non-linear Mooney-Rivlin constitutive equation implemented in the finite element code ABAQUS. With this model, the contact stresses existing between the o-ring and the back of the polymer seal have been determined for a range of o-ring squeezes and rubber hardnesses. The resultant lubrication and o-ring forces acting on the rectangular polymer seal have been used in a finite difference formulation of the seal (or beam on a spring base) to determine the seal deflection above the piston.en_ZA
dc.identifier.apacitationBarnes, J. J. (1991). <i>The performance of high speed reciprocating polymer seals in water</i>. (Thesis). University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Mechanical Engineering. Retrieved from http://hdl.handle.net/11427/18302en_ZA
dc.identifier.chicagocitationBarnes, Jonathan James. <i>"The performance of high speed reciprocating polymer seals in water."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Mechanical Engineering, 1991. http://hdl.handle.net/11427/18302en_ZA
dc.identifier.citationBarnes, J. 1991. The performance of high speed reciprocating polymer seals in water. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Barnes, Jonathan James AB - The elastohydrodynamic lubrication of polymeric piston seals in a water powered rockdrill has been modelled in this thesis. Current seal designs, consist of an Ultra High Molecular Weight Polyethylene (UHMWPE) ring, energised to remain in contact with the reciprocating piston, using a nitrile rubber o-ring. The design of the seals is such that they do not facilitate the formation of a lubricating film, and the high contact stresses at the seal face due to the seal pressure cause excessive wear of the seals. The elastohydrodynamic model is based on a numerical algorithm in which the elasticity equations for the seal deflection and the one dimensional lubrication equation have been solved simultaneously. The polymeric ring has been simplified due to its axisymmetry, and modelled in cross section as an elastic beam resting on a spring base, while the deformation of the o-ring has been considered independently since the moduli of the two materials differs by nearly two orders of magnitude. The o-ring was modelled using the non-linear Mooney-Rivlin constitutive equation implemented in the finite element code ABAQUS. With this model, the contact stresses existing between the o-ring and the back of the polymer seal have been determined for a range of o-ring squeezes and rubber hardnesses. The resultant lubrication and o-ring forces acting on the rectangular polymer seal have been used in a finite difference formulation of the seal (or beam on a spring base) to determine the seal deflection above the piston. DA - 1991 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1991 T1 - The performance of high speed reciprocating polymer seals in water TI - The performance of high speed reciprocating polymer seals in water UR - http://hdl.handle.net/11427/18302 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/18302
dc.identifier.vancouvercitationBarnes JJ. The performance of high speed reciprocating polymer seals in water. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Mechanical Engineering, 1991 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/18302en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Mechanical Engineeringen_ZA
dc.publisher.facultyFaculty of Engineering and the Built Environment
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherMechanical Engineeringen_ZA
dc.titleThe performance of high speed reciprocating polymer seals in wateren_ZA
dc.typeMaster Thesis
dc.type.qualificationlevelMasters
dc.type.qualificationnameMSc (Eng)en_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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