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Title: The failure mode analysis of plastic gears
Author: Cropper, Andrew Boyd
ISNI:       0000 0004 2730 4549
Awarding Body: University of Birmingham
Current Institution: University of Birmingham
Date of Award: 2003
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This thesis presents the work conducted under the auspices of the Brite EuRam funded project, "PROGEAR" (contract number BRPR-CT98-0703), which sought to better understand the failure modes of injection moulded plastic gears, such that their performance and reliability could be improved. In so doing, the work built upon previous research conducted at the Power Transmission Laboratory, at the University of Birmingham. This research utilised a range of materials including plain polymers and polymer composites, as well a wide variety of gear geometries. In addition, the type of testing that was carried out varied from dry running to oil-lubricated tests, using sophisticated, state-of-the-art equipment Five research areas were covered, and these were as follows: 1. The consolidation of existing knowledge in all aspects of injection moulded plastic gears, resulting in an extensive literature review. 2. The investigation of the dry-running wear resistance of plastic gears. 3. The investigation of the effects of oil-lubrication on the performance of plastic gears, includingt heir wear resistancea nd fatigues trength. 4. The investigation of the efficiency of plastic gears under dry-running, greaselubricated and oil-lubricated conditions. 5. The investigation of Pitch Line Fracture, which is a failure mode unique to dryrunning gears of specific polymeric materials. This thesis represents a significant contribution to the understanding of plastic gears, and should enable significant improvements in the power density, durability and wear resistance in future designs of plastic gears. This research also maps out important avenues for future research.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available