Electronic Speckle Pattern Interferometry (ESPI) NDE of cracks in pressure vessels with FEA modelling

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dc.contributor.advisorGryzagoridis, Jassonen_ZA
dc.contributor.authorMyles, John Roberten_ZA
dc.date.accessioned2014-09-05T12:38:37Z
dc.date.available2014-09-05T12:38:37Z
dc.date.issued1997en_ZA
dc.descriptionIncludes bibliographical references.en_ZA
dc.description.abstractThis dissertation describes the results of an attempt to simulate the Electronic Speckle Pattern Interferometric fringe patterns observed around a crack or combination of cracks in a pressure vessel by finite element methods. Electronic Speckle Pattern Interferometry (ESPI) is a coherent optical measurement technique that produces a contour map of the surface displacement of an object when it is stressed. The sensitivity of the techniques is of the order of half the Wavelength of light. The objective of the study was to determine a procedure for the modelling of interferometric fringes by finite elements. The finite element model may then be used to study the effects of crack geometry on fringe patterns and produce a library of reference fringe patterns for comparison with experimental fringe patterns found for unknown flaws. The approach to the problem was to simulate the fringe patterns for a crack free cylinder and compare these with these observed experimentally. The FE model modulus of elasticity was than to be calibrated to minimise uncertainty in the exact value of the elastic modulus. Once the model was calibrated, various cracks and combinations of cracks were introduced into both the physical cylinders and the FE model and fringe patterns obtained were compared. The experimental results for the cracks and combinations of cracks were compared with the finite element predictions at a range of loads.en_ZA
dc.identifier.apacitationMyles, J. R. (1997). <i>Electronic Speckle Pattern Interferometry (ESPI) NDE of cracks in pressure vessels with FEA modelling</i>. (Thesis). University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Mechanical Engineering. Retrieved from http://hdl.handle.net/11427/6922en_ZA
dc.identifier.chicagocitationMyles, John Robert. <i>"Electronic Speckle Pattern Interferometry (ESPI) NDE of cracks in pressure vessels with FEA modelling."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Mechanical Engineering, 1997. http://hdl.handle.net/11427/6922en_ZA
dc.identifier.citationMyles, J. 1997. Electronic Speckle Pattern Interferometry (ESPI) NDE of cracks in pressure vessels with FEA modelling. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Myles, John Robert AB - This dissertation describes the results of an attempt to simulate the Electronic Speckle Pattern Interferometric fringe patterns observed around a crack or combination of cracks in a pressure vessel by finite element methods. Electronic Speckle Pattern Interferometry (ESPI) is a coherent optical measurement technique that produces a contour map of the surface displacement of an object when it is stressed. The sensitivity of the techniques is of the order of half the Wavelength of light. The objective of the study was to determine a procedure for the modelling of interferometric fringes by finite elements. The finite element model may then be used to study the effects of crack geometry on fringe patterns and produce a library of reference fringe patterns for comparison with experimental fringe patterns found for unknown flaws. The approach to the problem was to simulate the fringe patterns for a crack free cylinder and compare these with these observed experimentally. The FE model modulus of elasticity was than to be calibrated to minimise uncertainty in the exact value of the elastic modulus. Once the model was calibrated, various cracks and combinations of cracks were introduced into both the physical cylinders and the FE model and fringe patterns obtained were compared. The experimental results for the cracks and combinations of cracks were compared with the finite element predictions at a range of loads. DA - 1997 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1997 T1 - Electronic Speckle Pattern Interferometry (ESPI) NDE of cracks in pressure vessels with FEA modelling TI - Electronic Speckle Pattern Interferometry (ESPI) NDE of cracks in pressure vessels with FEA modelling UR - http://hdl.handle.net/11427/6922 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/6922
dc.identifier.vancouvercitationMyles JR. Electronic Speckle Pattern Interferometry (ESPI) NDE of cracks in pressure vessels with FEA modelling. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Mechanical Engineering, 1997 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/6922en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Mechanical Engineeringen_ZA
dc.publisher.facultyFaculty of Engineering and the Built Environment
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherMechanical Engineeringen_ZA
dc.titleElectronic Speckle Pattern Interferometry (ESPI) NDE of cracks in pressure vessels with FEA modellingen_ZA
dc.typeMaster Thesis
dc.type.qualificationlevelMasters
dc.type.qualificationnameMScen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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