Paper number 773


F. Coman1 , S. John1, I. Herszberg2.

1Royal Melbourne Institute of Technology, University, Department of Mechanical & Manufacturing Engineering,
Bundoora East Campus, Vic. 3083, Australia.
2Royal Melbourne Institute of Technology, University, Department of Aerospace Engineering, The Sir Lawrence Wackett Centre for Aerospace Design Technology, GPO Box 2476V, Melbourne, 3001, Australia.

Summary In order to quantify the macro-mechanical response of composite materials-based engineering components, the physical micro-relationships of a unit cell yarn configuration is assumed to be repeated is considered important. The geometric undulations of the yarns that constitute the structure of a unit-cell is the focus of the analysis in this paper. The unit-cell's geometric description is idealised and is assumed to reliably represented by standard geometric lines. The unit-cell described here, consisted of six warp layers, seven weft layers and a binder yarn in the weft direction. This is only one of the several weave architectures designed and manufactured as part of the research program. The benefits of the analyses include the corroboration of the geometric model with computer-simulations of the unit cell geometry and predictive models of physical entities such as volume fractions and yarn tensions. Analytic relationships of yarn tensions with unit-cell-based geometric characteristics have been developed to corroborate physical observations. Analytic models of other geometric characteristics such as unit-cell binder length, weft and warp pitch have also all been compared with pictorial representations of the corresponding geometric feature.
Keywords micro-features, undulations, weft and warp yarns, architectures, binder length, unit-cell, predictive models, analytic corroboration.

Theme : Textiles ; Preform Processing and Testing

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