A multi-station flex fatigue tester has been developed, allowing a wide range of environmental settings. A detailed study of fatigue behaviour under increasing temperature and humidity is made. In general, an upward trend in fatigue life of all the polymers tested is recorded with increasing temperature and humidity. Scanning electron microscope studies of unbroken samples under specific conditions revealed a central split in the fibre at the point of flexure. Partially fatigued fibres are tensile tested for their remaining strength and their fracture morphologies examined. Finally, a theoretical explanation of the apparent cause of increase in fatigue life is given in relation to the development of the central crack.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:375735 |
| Date | January 1986 |
| Creators | Miraftab, M. |
| Publisher | University of Manchester |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
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