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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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Abstract

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.

Document Type:Article
Additional Information: LIDO-Berichtsjahr=2000,
Title:Elastic stiffness analysis of a thermo-formed plain-weave fabric composite. Part I: Geometry
Authors:
AuthorsInstitution or Email of Authors
Hofstee, J.UNSPECIFIED
de Boer, H.Delft University of Technology, The Netherlands
van Keulen, F.Delft University of Technology, The Netherlands
Date:2000
Journal or Publication Title:Composites Science & Technology
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:60
Page Range:pp. 1041-1053
Status:Published
Keywords:thermoforming, geometry, composites, fabrics, microstructure, laminates, optical microscopy
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:L ST - Starrflüglertechnologien
DLR - Research theme (Project):UNSPECIFIED
Location: Stuttgart
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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