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Damage growth in bending of composite beams

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dc.contributor.author Dorosh, Mark Norman
dc.date.accessioned 2010-09-09T22:31:43Z
dc.date.available 2010-09-09T22:31:43Z
dc.date.copyright 1988 en
dc.date.issued 2010-09-09T22:31:43Z
dc.identifier.uri http://hdl.handle.net/2429/28376
dc.description.abstract A study has been made of glass fibre reinforced plastic beams in three-point bending. In recent years, the importance of flexural loading in composites has manifested itself in the form of composite leaf springs, helicopter rotors, and other applications. This study is directed at the initiation, growth, characterization and measurement of damage in unidirectional and cross-ply composite beams. Beams were tested in three-point static and cyclic bending. Following damage initiation, either by a machined notch or by repeated cycling, damage growth has been characterized by two damage parameters: a damage depth encompassing a number of broken fibres on the tensile surface at the central load point, and a damage length or delamination parallel to the beam longitudinal axis. A model was developed to predict the compliance, or deflection under applied load, as a function of beam properties and damage dimensions. The model is able to predict the compliance of damaged beams with reasonable accuracy. From fracture mechanics concepts it is shown that the two damage dimensions, depth and length, are related. It is concluded that the increase in compliance, a result of the growing damage dimensions, is related to the growth of the damage depth; the damage length follows from the relation between damage parameters and the compliance follows from the compliance model. The damage state can thus be determined by compliance measurements if the relevant material properties and loading conditions are known. However, in service, compliance measurements may not be practical. Therefore a section of this study is devoted to an alternative damage measurement technique, namely acoustic emission monitoring. Damage initiation, compliance, damage length and damage depth were measured with AE monitoring techniques. en
dc.language.iso eng en
dc.publisher University of British Columbia en
dc.relation.ispartofseries UBC Retrospective Theses Digitization Project [http://www.library.ubc.ca/archives/retro_theses/] en
dc.subject Composite construction en
dc.subject Flexure en
dc.title Damage growth in bending of composite beams en
dc.type Electronic Thesis or Dissertation en
dc.degree.name Master of Applied Science - MASc en
dc.degree.discipline Materials Engineering en
dc.degree.grantor University of British Columbia en
dc.degree.campus UBCV en
dc.description.scholarlevel Graduate en

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