Study of processing conditions on the forming of ribbed features using randomly-oriented strands thermoplastic composites

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TypeArticle
Proceedings titleAHS 70th Annual Forum
Series titleAnnual Forum Proceedings - AHS International
Conference70th American Helicopter Society International Annual Forum 2014, May 20-22, 2014, Montreal, Quebec
ISSN1552-2938
ISBN978-163266691-8
Pages10621070; # of pages: 9
SubjectMechanical properties; Component testing; Filling pressures; Lower temperatures; McGill University; Mechanical performance; Montreal , Canada; Processing condition; Thermoplastic composite; Helicopters
AbstractCompression moulding of randomly-oriented strands composites offer the possibility to manufacture complex parts with fast processing cycle. In this paper, effects of pressure, strand size, temperature and material placement in the mould cavity on the quality of a T-shape part were studied experimentally. Low pressure results showed both strand size and temperature effects on the filling of a 25 mm rib deep cavity. Critical filling pressures for three strand sizes were obtained. A pressure of 10 bar was enough to fully consolidate parts with smaller strand (3.17 mm × 6.35 mm) at 400 °C. Parts processed at filling pressure showed a void content no greater than 1.2 %. Increasing pressure to 70 bar resulted in decreased void content between 0.44 % and 0.03 %. The lowest void content was obtained for parts processed at lower temperature. Short-beam shear (ASTM D2344) showed similar strength for ribs processed at filling pressure and high pressure (70 bar). This same trend was observed for component testing of the T-shape. At the component level, initial strand placement greatly affected mechanical performance as merging flow fronts caused a knit line and a reduction of at most 40 % in strength. The main findings show that processing a complex feature at filling pressure Pfill was sufficient to reach nominal mechanical properties. This suggested that moderate porosity was not detrimental to the mechanical performance for the given tests.
Publication date
PublisherAmerican Helicopter Society
LanguageEnglish
AffiliationAerospace; National Research Council Canada
Peer reviewedYes
NPARC number21276128
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Record identifier2e726838-49c4-4663-bcca-761e5b2d5396
Record created2015-09-25
Record modified2016-05-09
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