A rapid test for evaluating the degree of cure in CFRP composites |
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Authors: | J C Krapez P Cielo K Cole G Vaudreuil |
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Institution: | (1) Industrial Materials Research Institute National Research Council Canada, Boucherville, Québec, Canada |
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Abstract: | A noncontact optothermal method is described for possible application to routine industrial evaluation of the degree of cure in polymeric composites. The surface of the part is heated by a laser beam or other radiative source while its temperature evolution is continuously monitored with an infrared detector. A strong exothermal peak is observed when the material is partially or totally uncured. Changes in the signal shape related to variations of the part geometry or environmental conditions are minimized by a differential approach comparing subsequent heat cycles on the same area. Results obtained with cured or uncured graphite-epoxy prepreg sheets are presented.
Zusammenfassung Es wird eine Nonkontaktmethode zur möglichen Anwendung für industrielle Routinebestimmungen des Vulkanisationsgrades von Polymergemischen beschrieben. Die Oberfläche der Probe wird durch einen Laserstrahl oder durch eine andere Strahlungsquelle erhitzt, wobei das Temperaturverhalten durch einen Infrarotmonitor kontinuierlich verfolgt wird. Ist das Metall partiell oder vollkommen vulkanisiert, kann man ein stark exothermes Signal beobachten. Durch Probengeometrie oder Umweltbedingungen verursachte Signalformänderungen werden durch eine Differentialnäherung mittels Vergleich aufeinanderfolgender Erhitzungszyclen an der gleichen Stelle minimal gehalten. Es werden einige Ergebnisse von vulkanisierten und unvulkanisierten Graphit-Epoxy Blättchen dargelegt.
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![ycy](/content/k4j383u183848872/xxlarge1099.gif) ![mcy](/content/k4j383u183848872/xxlarge1084.gif) ![bcy](/content/k4j383u183848872/xxlarge1073.gif) ![rcy](/content/k4j383u183848872/xxlarge1088.gif) ![acy](/content/k4j383u183848872/xxlarge1072.gif) ![zcy](/content/k4j383u183848872/xxlarge1079.gif) ![tscy](/content/k4j383u183848872/xxlarge1094.gif) ![acy](/content/k4j383u183848872/xxlarge1072.gif) ![mcy](/content/k4j383u183848872/xxlarge1084.gif) ![fcy](/content/k4j383u183848872/xxlarge1092.gif) ![ocy](/content/k4j383u183848872/xxlarge1086.gif) ![rcy](/content/k4j383u183848872/xxlarge1088.gif) ![mcy](/content/k4j383u183848872/xxlarge1084.gif) ![lcy](/content/k4j383u183848872/xxlarge1083.gif) ![icy](/content/k4j383u183848872/xxlarge1080.gif) ![scy](/content/k4j383u183848872/xxlarge1089.gif) ![tcy](/content/k4j383u183848872/xxlarge1090.gif) ![ocy](/content/k4j383u183848872/xxlarge1086.gif) .
One part appeared in NDT Comm., 3 (1987) 1. |
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