Damage sensing in CFRP composites using electrical potential techniques

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dc.contributor.advisorIrving, Phil E.en_UK
dc.contributor.authorAngelidis, Nikolaosen_UK
dc.date.accessioned2005-11-23T14:36:21Z
dc.date.available2005-11-23T14:36:21Z
dc.date.issued2004-02en_UK
dc.description.abstractThis Thesis investigates the damage sensing capabilities of the electrical potential measurement technique in carbon fibre reinforced polymer composites. Impact damage was introduced in multidirectional laminates and its effect on potential distribution studied. It was found that delaminations and fibre breakages within the laminate can be detected and located by measuring potential changes on the external composite surface. The extent and size of potential changes were significantly affected by the position of the current electrodes in relation to the potential measurement probes. A numerical model was developed investigating the effect of different size delaminations, located in various positions within the lamina, on electrical potential distributions on the external ply, and a quantitative analysis of the numerical results is presented. The numerical simulations demonstrated that the measured potential changes on the external ply were in proportion to the delamination size. The numerical and experimental results were compared and the optimum configuration of current electrodes and potential probes for damage detection selected. The response of electrical potential to mechanical strain, in unidirectional and multidirectional samples was also investigated. It was found that the conductive medium, used for introducing the current, defines the piezo-resistance performance of the composite. A finite element model was developed able to predict the effect of inhomogeneous current introduction in unidirectional specimens on electrical potential and piezo-resistance. The effects of temperature and water absorption on potential measurements were also presented.en_UK
dc.format.extent263376 bytes
dc.format.extent11052954 bytes
dc.format.extent1883 bytes
dc.format.mimetypeapplication/pdf
dc.format.mimetypeapplication/pdf
dc.format.mimetypetext/plain
dc.identifier.urihttp://hdl.handle.net/1826/127
dc.language.isoen_UKen_UK
dc.publisherCranfield Universityen_UK
dc.publisher.departmentSchool of Industrial Manufacturing and Science
dc.subject.otherCarbon fibre reinforced polymer compositesen_UK
dc.subject.otherImpact damageen_UK
dc.subject.otherMultidirectional laminatesen_UK
dc.subject.otherMechanical strainen_UK
dc.titleDamage sensing in CFRP composites using electrical potential techniquesen_UK
dc.typeThesis or dissertationen_UK
dc.type.qualificationlevelDoctoral
dc.type.qualificationnamePhD

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PhD, EngD, MPhil and MSc by research theses (SAS)