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research article

Warp-knit laminates for stampable sandwich preforms

Rozant, O.
•
Bourban, P.-E.  
•
Månson, J.-A. E.  
2001
Composites Science and Technology

Thermoforming of doubly-curved sandwich components will o er new design possibilities and cost-e ective manufacturing routes. However, the occurrence of folds and wrinkles in face sheets is directly linked to the fabric architecture and constitutes a process-limiting factor. Drapability tests have shown that knitted fabrics are less susceptible to wrinkling than woven preforms because their loop structure can more easily accommodate large deformations. In the experiments described here, a novel glass warp-knit fabric was impregnated with polyetherimide (PEI). The characterisation at ambient and forming temperatures of PEI eight-harness satin reinforced laminates and PEI laminates reinforced with the new warp-knit structure is presented. Mechanical tests at room and forming temperatures show that warp-knit reinforced composites have non-linear tensile behaviour. However at forming temperatures they exhibit quasi-isotropic behaviour and potential for high global and local strains, which is desirable for thermoforming of complex shapes. The influence of the fabric's compressive response on deconsolidation was also investigated. Deconsolidation onset was determined by thermo-mechanical and microscopic analysis. Thermoforming experiments were performed on woven and knitted PEI reinforced laminates. The potential of laminates with knitted reinforcement for the processing of complex shaped parts has been demonstrated. Consequently, these laminates will be used as new face sheets for stampable thermoplastic sandwiches. Finally, a thermoforming map representing the areal draw ratio as a function of the laminate processability was deduced from the high temperature tensile tests.

  • Details
  • Metrics
Type
research article
DOI
10.1016/S0266-3538(00)00209-8
Web of Science ID

WOS:000166533600014

Author(s)
Rozant, O.
Bourban, P.-E.  
Månson, J.-A. E.  
Date Issued

2001

Published in
Composites Science and Technology
Volume

61

Issue

1

Start page

145

End page

156

Subjects

A. polymer-matrix composites

•

A. textile composites

•

C. sandwich

•

E. knitting

•

thermoforming

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LTC  
Available on Infoscience
June 26, 2006
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/232293
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