The Fracture Behavior of CTBN Modified Epoxy

Autor:	Paul Peyser, Yitchak Steg
Rok vydání:	1988
Předmět:	Toughness Materials science Fracture mechanics Surfaces and Interfaces General Chemistry Epoxy Surfaces Coatings and Films Potting Fracture toughness Natural rubber Mechanics of Materials visual_art Materials Chemistry visual_art.visual_art_medium Adhesive Composite material Stress intensity factor
Zdroj:	The Journal of Adhesion. 25:133-144
ISSN:	1545-5823 0021-8464
Popis:	Rubber toughened epoxy resins are widely used as adhesives, as a matrix for glass and carbon fiber composites for rocket cases and sporting goods, and as a potting agent in the electronics industry. A common rubber added is CTBN, a carboxyl terminated copolymer of butadiene and acrylonitrile. In this study we have measured toughness (K1C and G1C ) using the E399 ASTM standard for a compact tension (CT) specimen, with special attention to the variability of the measured K1C and G1C with the method of starter crack formation and the time delay between starter crack formation and toughness measurement. We also investigated the toughness of the toughened epoxy after initiation, for a growing crack, by using the short rod (SR) method and when possible in a CT specimen by using a simple marking technique. The CT toughness of unmodified epoxy measured using a liquid nitrogen initiator crack technique is the same as that of earlier work, but we found that the KIC and G1C toughness increases when there is...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::751349a7a6329f5e0a8e0a6156139375 https://doi.org/10.1080/00218468808071255 Zobrazit plný text záznamu