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The performance of high speed reciprocating polymer seals in water
Bibliography: pages 93-94.
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| Main Author: | |
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| Other Authors: | |
| Format: | Thesis |
| Language: | English |
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Department of Mechanical Engineering
2016
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| _version_ | 1867613274577567744 |
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| access_status_str | Open Access |
| author | Barnes, Jonathan James |
| author2 | Martin, J B |
| author_browse | Barnes, Jonathan James Martin, J B |
| author_facet | Martin, J B Barnes, Jonathan James |
| author_sort | Barnes, Jonathan James |
| collection | Thesis |
| description | Bibliography: pages 93-94. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/18302 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:33:31.121Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2016 |
| publishDateRange | 2016 |
| publishDateSort | 2016 |
| publisher | Department of Mechanical Engineering |
| publisherStr | Department of Mechanical Engineering |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/18302 The performance of high speed reciprocating polymer seals in water Barnes, Jonathan James Martin, J B Mechanical Engineering Bibliography: pages 93-94. 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. 2016-03-28T14:38:33Z 2016-03-28T14:38:33Z 1991 Master Thesis Masters MSc (Eng) http://hdl.handle.net/11427/18302 eng application/pdf Department of Mechanical Engineering Faculty of Engineering and the Built Environment University of Cape Town |
| spellingShingle | Mechanical Engineering Barnes, Jonathan James The performance of high speed reciprocating polymer seals in water |
| thesis_degree_str | Master's |
| title | The performance of high speed reciprocating polymer seals in water |
| title_full | The performance of high speed reciprocating polymer seals in water |
| title_fullStr | The performance of high speed reciprocating polymer seals in water |
| title_full_unstemmed | The performance of high speed reciprocating polymer seals in water |
| title_short | The performance of high speed reciprocating polymer seals in water |
| title_sort | performance of high speed reciprocating polymer seals in water |
| topic | Mechanical Engineering |
| url | http://hdl.handle.net/11427/18302 |
| work_keys_str_mv | AT barnesjonathanjames theperformanceofhighspeedreciprocatingpolymersealsinwater AT barnesjonathanjames performanceofhighspeedreciprocatingpolymersealsinwater |