국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	Evaluation of Test Method on the Tensile Properties of Cross-ply CFRP
저자	Yoshio NOGUCHI
Keyword	Composite materials; Carbon/epoxy; Cross ply laminates; Tensile test; Fatigue strength; Damage; X-ray radiography
URL	http://send.nal.go.jp/send/jpn/dlpdf.php3/naltm0000736.pdf?id=NALTM0000736
보고서번호	NAL TM-736
발행년도	1999.01
출처	NAL (National Aerospace Laboratory of Japan)
ABSTRACT	To establish a standardized test method for evaluating the strength characteristics of composite materials, we performed tensile tests on CFRP. Carbon fiber with high-strength and intermediate/elastic/modulus was used for the reinforced fiber with epoxy resin. Test plates were three kinds of cross-ply CFRP: four plies, eight plies and twelve plies, where all lamination numbers were symmetrical in respect of the unidirectional fiber reinforced prepreg. A straight-sided coupon test piece was used, and the cases in which the tip shape of tab material for the grip portions was tapered and at right angle were compared. Static tensile strength tests and tensile fatigue strength tests of each cross-ply CFRP were carried out. Damage and destruction aspects of the test pieces were observed by an X-ray radiography penetrative crack detection method. The tensile fatigue strength of cross-ply CFRP with lower lamination number was teduced. Due to adhesion peeling in the taper, the effect of the taper disappeared in the tip of the grip portion tab of the test piece.