Experimental measurement of wrinkle formation during draping of non-crimp fabric |
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| Affiliation: | 1. Karlsruhe Institute of Technology (KIT), Institute of Vehicle System Technology (FAST), Department of Lightweight Technology (LBT), Karlsruhe, Germany;2. Karlsruhe Institute of Technology (KIT), Institute for Applied Materials (IAM), Karlsruhe, Germany;3. Fraunhofer Institute for Chemical Technology, Pfinztal, Germany;1. Université de Nantes, Institut de Recherche en Génie Civil et Mécanique (GeM), 58 Rue Michel Ange, 44606 Saint Nazaire, France;2. Chomarat, 39 Avenue de Chabannes, 07160 Le Cheylard, France |
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| Abstract: | A rig and image analysis methodology is described to characterise wrinkle formation during draping of non-crimp fabrics. The circular fabric blank is draped over a male hemispherical mould, partly constrained by a circular clamping ring around the periphery of the blank. The three-dimensional shape of the fabric is derived from a shape-from-focus analysis of a stack of photographs of the deformed blank. Wrinkles are identified from the deviation of the shape from a smoothed shape. Wrinkle formation is strongly dependent on the fabric architecture and increases progressively with increased punch displacement. Triaxial fabrics have the highest wrinkle amplitude, unidirectional and 0/90° biaxial fabrics the lowest amplitude. The clamping force reduces the wrinkling for some fabrics but, for the maximum force applied, is not effective at eliminating wrinkling. |
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| Keywords: | A. Carbon fibre A. Fabrics/textiles E. Preforming Wrinkling |
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