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Title: Structural mechanics of plain knitted elastomeric structures
Author: Yahathugoda, B. P. S. Dilruk
Awarding Body: University of Manchester
Current Institution: University of Manchester
Date of Award: 2005
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Considerable interest has developed recently in 'stretch' and 'power' fabrics and their component yams. Stretch fabrics are finding applications in areas such as medical compression therapy, support for back, knee and ankle, and in prosthetics. These stretch fabrics can be made by either knitting or weaving; knitted structures are widely used as stretch fabrics due to their inherent elasticity, drapability and the relative ease of fabrication with stretchable yams. Therefore, the present research work deals with the development of comprehensive mechanical models to predict the mechanical properties of plain knitted elastomeric structures namely the tensile, and interface pressure profile behaviour. All the models are based on Rayleigh-Ritz energy approach, which allows handling nonlinear mechanical properties of constituent yams while producing computationally efficient algorithms. The models incorporate modes of deformation i.e. yam elongation, yam bending and yam compression. An effort has been made to make the models more general by considering generalised geometry with adequate degrees of freedom to represent the yam path under all deformed configurations. A geometric model based on cubic spline geometry has been developed and it has been shown that the energy model based on this geometry closely simulates plain knitted elastomeric structure's mechanical behaviour in contrast to Chamberlain geometry. And therefore, cubic spline geometry has been applied for elastomeric plain knitted derivative structure, which is a stable structure and very much more capable of achieving the required high pressure profiles than the plain knitted elastomeric structure, and maintaining them over a useful period of time. This study also describes experimental investigation into the physical, structural, and mechanical behaviour of both constituent yam, i.e. covered elastomeric yams and plain knitted elastomeric fabrics, in order to ascertain the contribution of core and covered yams in terms of structural mechanical properties.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available