국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	Evaluation of Fatigue Crack Growth Characteristics of a Fiber/Metal Laminate GLARE3-5/4
저자	Toru TAKAMATSU, Takashi MATSUMURA, Norio OGURA, Toshiyuki SHIMOKAWA, Yoshiaki KAKUTA
Keyword	fiber/metal laminate; GLARE; fatigue; crack growth; variability; stress intensity factor; fiber bridging; delamination; analytical method
URL	http://send.nal.go.jp/send/jpn/dlpdf.php3/naltr0001366.pdf?id=NALTR0001366
보고서번호	NAL TR-1366
발행년도	1998.10
출처	NAL (National Aerospace Laboratory of Japan)
ABSTRACT	The objective of this study is to investigate the properties of fatigue crack growth in a GLARE3-5/4 fiber/metal laminate and the validity of methods for analyzing the fatigue crack growth of fiber/metal laminates. GLARE3-5/4 consists of five thin sheets of 2024-T3 aluminum alloy and four layers of (0/90) glass/epoxy. Centrally notched specimens were fatigue tested under constant amplitude loading and crack length was measured using the DC potential-drop method. The size of the delamination produced between aluminum alloy sheets and fiber-adhesive layers was measured from C-scan pictures taken around a fatigue crack. The following conclusions were drawn : (1) The scatter in fatigue crack growth lives was a little higher than that of a 2024-T3 aluminum alloy. (2) The relationship between crack growth rate, da/dN, versus stress intensity factor range, ΔK , obtained on the assumption of a monolithic material was different from that of a single 2024-T3 aluminum alloy machined from the GLARE and showed the maximum stress dependence. (3) The relationship between da/dN and Δkfin, the stress intensity factor range analyzed by Marissen on the basis of a fiber bridging effect, approximately agreed with that of a single 2024-T3 aluminum alloy specimen regardless of the maximum stress.