Fatigue damage mechanisms in fiber reinforced composite materials including the effect of cyclic loading frequency

dc.contributor.authorWilliams, Richard Scotten
dc.contributor.departmentMaterials Engineering Scienceen
dc.date.accessioned2018-03-26T19:29:16Zen
dc.date.available2018-03-26T19:29:16Zen
dc.date.issued1975en
dc.description.abstractA broad-based investigation seeking to characterize fatigue damage mechanisms in fiber reinforced composite materials, accounting for the effect of cyclic loading frequency, is presented. A many faceted approach to the investigation was utilized; which included well documented strain-controlled fatigue tests, a scanning electron microscopy study, implementation of energy emission techniques (such as acoustic and thermal emissions), and the development of an energy-based failure theory. A detailed discussion of each aspect of the investigation is presented and, in each case, pertinent conclusions are drawn. The effect of cyclic loading frequency on fatigue damage development is documented and found to be substantial. A micro-mechanical damage model, which accounts for the effects of frequency and fiber/matrix interface strength, is developed. Using a first law analysis, a good correlation between acoustic and thermal emission with damage propagation and extent is developed. Finally, a new conceptual theory, called the Strain Energy Release-Potential Theory, is postulated. Predictions based on this theory are made and compared with experimental findings, resulting in substantial agreement.en
dc.description.degreePh. D.en
dc.format.extentviii, 130 leavesen
dc.format.mimetypeapplication/pdfen
dc.identifier.urihttp://hdl.handle.net/10919/82641en
dc.language.isoenen
dc.publisherVirginia Polytechnic Institute and State Universityen
dc.relation.isformatofOCLC# 40167168en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V856 1975.W54en
dc.titleFatigue damage mechanisms in fiber reinforced composite materials including the effect of cyclic loading frequencyen
dc.typeDissertationen
dc.type.dcmitypeTexten
thesis.degree.disciplineMaterials Engineering Scienceen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.leveldoctoralen
thesis.degree.namePh. D.en
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