Journal
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
Volume 70, Issue -, Pages 121-131Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2014.11.017
Keywords
Discontinuous reinforcement; Thermoplastic resin; Porosity; Compression moulding
Funding
- Bell Helicopter Textron Canada Limited
- Bombardier Inc.
- Pratt and Whitney Canada Corp.
- Marquez Transtech Limited
- Delastek Inc.
- Avior Integrated Products Inc.
- Natural Sciences and Engineering Research Council (NSERC)
- Consortium for Research and Innovation in Aerospace in Quebec (CRIAQ)
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Compression moulding of randomly oriented strands (ROS) of thermoplastic composite is a process that enables the forming of complex shapes with keeping final properties close to that of continuous fibre composites. During forming several deformation mechanisms occur. In this paper we focus on the interstrand void content (ISVC) reduction: the squeezing of each single strand during compression enables filling of the gaps between strands. A modelling of this deformation mechanism was developed. The compaction is ruled by an ordinary differential equation that was solved numerically. The model was validated experimentally using an instrumented hot press with Carbon-PEEK prepreg strands. The model accurately predicted ISVC in four characteristic cases. Using the proposed model, the influence of several process and material parameters were investigated. Finally, a design chart giving the final ISVC for a wide range of pressure, strand geometry and part thickness, was constructed. (C) 2014 Elsevier Ltd. All rights reserved.
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