On the initiation and propagation of fatigue cracks in WC-Co

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dc.contributor.authorErling, Ghita
dc.date.accessioned2017-06-02T11:53:09Z
dc.date.available2017-06-02T11:53:09Z
dc.date.issued1998
dc.descriptionA dissertation submitted to the Faculty of Engineering, University of the Witwatersrand, in fulfilment of the requirements for the degree of Master of Science in Engineering, Johannesburg, 1998en_ZA
dc.description.abstractThis research examines fatigue in WC-Co, both under compressive and tensile loading conditions. A new macro-mechanism for compression fatigue crack propagation is put forward, which contradicts existing data on compression fatigue cracks as being self-limiting. Evidence of this macro-mechanism is presented in the form of final crack length versus number of cycles data, and micrographs of the compression fatigue cracks. A finite element study of the stress distribution in the WC-Co microstructure during compression fatigue loading has been developed. This model verifies possible methods of compression fatigue crack initiation. Examination of tensile fatigue and fast: fracture surfaces is used to show that fatigue is a separate mechanism to fast fracture in WC-Co. Characteristic features of the fatigue fracture surface are presented. A possible fatigue crack propagation mechanism is also presented. Finally, fatigue crack growth rate data in the form of the Paris equation is presented for WC-Co grades T6 and G6.en_ZA
dc.description.librarianMT2017en_ZA
dc.format.extentOnline resource (130 leaves)
dc.identifier.citationErling, Ghita (1998) On the initiation and propagation of fatigue cracks in WC-Co, University of the Witwatersrand, Johannesburg,<http://hdl.handle.net/10539/22772>
dc.identifier.urihttp://hdl.handle.net/10539/22772
dc.language.isoenen_ZA
dc.subject.lcshMaterials--Fatigue
dc.subject.lcshStrains and stresses
dc.subject.lcshStructural failures
dc.subject.lcshStrength of materials
dc.subject.lcshFatigue testing machines
dc.titleOn the initiation and propagation of fatigue cracks in WC-Coen_ZA
dc.typeThesisen_ZA
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