Elastic stiffness analysis of a thermo-formed plain-weave fabric composite. Part I: Geometry
Hofstee, J. and de Boer, H. and van Keulen, F. (2000) Elastic stiffness analysis of a thermo-formed plain-weave fabric composite. Part I: Geometry. Composites Science & Technology, 60 (7), pp. 1041-1053.
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The present paper investigates experimentally the influence of thermoforming on the geometry of a plain-weave carbon fibre thermoplastic laminate. Specifically, effects the fabric stretching and simple shear deformation modes on yarn crimp and cross-section geometry are examined. For that purpose, specimens are stretched and sheared in a heat chamber above the melting temperature of the resin. Microscopic geometry analyses are carried out on laminate cross-sections prepared along both yarn directions. It is found that both deformation modes significantly influence yarn crimp and cross-section geometry. The observed deformations are schematised in order to enable stiffness modelling in Part II of this paper. To verify the proposed schematisations, additional laminate cross-sections are cut from thermoformed products which contain several areas with nearly constant shear deformation. Fabric stretching and simple shear occur simultaneously in the products. Observed yarn deformations correspond well with the proposed schematisations.
|Title:||Elastic stiffness analysis of a thermo-formed plain-weave fabric composite. Part I: Geometry|
|Journal or Publication Title:||Composites Science & Technology|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 1041-1053|
|Keywords:||thermoforming, geometry, composites, fabrics, microstructure, laminates, optical microscopy|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Aeronautics|
|HGF - Program Themes:||L - no assignement|
|DLR - Research area:||Aeronautics|
|DLR - Program:||L ST - Starrflüglertechnologien|
|DLR - Research theme (Project):||UNSPECIFIED|
|Institutes and Institutions:||Institute of Structures and Design|
|Deposited By:||elib DLR-Beauftragter|
|Deposited On:||16 Sep 2005|
|Last Modified:||14 Jan 2010 22:16|
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