Reduction of free edge effect in graphite reinforced thermoplastic laminates

Disclosed herein is a method of reducing residual stresses in a fibre reinforced thermoplastic composite laminate. The method includes the step of providing a fibre reinforced thermoplastic composite laminate having at least one free edge. Thereafter, a region adjacent the free edge is heated for a...

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Bibliographische Detailangaben
Hauptverfasser:	HANSEN, JORN S, UNGER, WILLIAM J, KO, HENRY Y.S
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING PERFORMING OPERATIONS SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	Disclosed herein is a method of reducing residual stresses in a fibre reinforced thermoplastic composite laminate. The method includes the step of providing a fibre reinforced thermoplastic composite laminate having at least one free edge. Thereafter, a region adjacent the free edge is heated for a time period sufficient to form a localized melt zone of the thermoplastic in the region while under a sufficient pressure to prevent delamination of the laminate. Once this has been done, the region is cooled for a time period and under a pressure sufficient to solidify the region and to prevent delamination thereof.