Effect of preheat temperature on the formability of carbon fibre/PEEK composites

Davey, S, Das, R, Cantwell, W and Kalyanasundaram, S 2012, 'Effect of preheat temperature on the formability of carbon fibre/PEEK composites', in Proceedings of the 7th Australasian Congress on Applied Mechanics (ACAM 7), Adelaide, Australia, 9-12 December 2012, pp. 953-961.


Document type: Conference Paper
Collection: Conference Papers

Title Effect of preheat temperature on the formability of carbon fibre/PEEK composites
Author(s) Davey, S
Das, R
Cantwell, W
Kalyanasundaram, S
Year 2012
Conference name ACAM 7
Conference location Adelaide, Australia
Conference dates 9-12 December 2012
Proceedings title Proceedings of the 7th Australasian Congress on Applied Mechanics (ACAM 7)
Publisher Engineers Australia
Place of publication Barton A.C.T., Australia
Start page 953
End page 961
Total pages 9
Abstract Thermoplastic composites are currently utilised in applications where high specific stiffness and strength is required. However, current manufacturing processes are time consuming and costly. For these materials to be utilised in a wide range of applications, rapid forming mechanisms must be developed. In this study, the formability of carbon fibre reinforced PEEK was examined in stamp forming processes. Composite blanks created from plain weave carbon fabric in a PEEK matrix were formed until failure at various temperatures in an open-die system using a hemispherical punch. Monolithic aluminium samples were formed for the sake of comparison. During forming, real-time strain measurements were taken from the lower surface of the blanks and strain distributions were plotted. Results showed that CF/PEEK experiences a much lower maximum strain than aluminium at any given depth, allowing it to form without inducing failure in the carbon fibres. High temperatures were found to cause large shear strains. This caused a slight reduction in maximum strain in the fibre direction of the composite, slightly increasing the forming depth. A complete understanding of the forming behaviour of CF/PEEK could enable rapid forming processes to be implemented, thereby allowing this material to be utilised in a wide variety of applications.
Subjects Composite and Hybrid Materials
Keyword(s) carbon fibre reinforced polymers
real-time strain measurements
stamp forming
thermoplastic composites
Copyright notice © 2012 Engineers Australia, The Authors
ISBN 9781922107619
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