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

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DOIResolve DOI: http://doi.org/10.4050/JAHS.60.011005
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TypeArticle
Journal titleJournal of the American Helicopter Society
ISSN0002-8711
Volume60
Issue1
Pages11005
SubjectCompression molding; Filling; Ketones; Mechanical properties; Mechanical testing; Molds; Tensile strength; Complex parts; Component levels; Fast Processing; Fatigue performance; Filling pressures; Mechanical performance; Processing condition; Thermoplastic composite; Processing
AbstractCompression molding of randomly oriented strands (ROS) composites offers the possibility to manufacture complex parts with a fast processing cycle. In this paper, effects of pressure, strand size, temperature, and material placement in the mold cavity on the quality of a T-shape part were studied experimentally with carbon/polyether ether ketone ROS composites. Minimum filling pressure was obtained for the consolidation of a 25-mm deep cavity. Parts processed at filling pressure showed a void content no greater than 1.2%. Increasing pressure to 70 bar resulted in decreased void content as low as 0.03%. Mechanical testing of the T-shape showed similar strengths for parts processed at filling pressure and higher (70 bar). At the component level, initial strand placement greatly affected mechanical performance as the presence of a knit line was responsible for a reduction of 60% in tensile 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 where fatigue performance was not evaluated. © 2015 The American Helicopter Society.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC)
Peer reviewedYes
NPARC number21275635
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Record identifier7246d29a-9f22-41a1-8a58-db65b704f3f0
Record created2015-07-14
Record modified2016-05-09
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