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1 NAL TM-736 NAL TM-736 ISSN UDC TECHNICAL MEMORANDUM OF NATIONAL AEROSPACE LABORATORY TM-736 CFRP NATIONAL AEROSPACE LABORATORY

2 S N

3 CFRP * 1 Yoshio NOGUCHI 1 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. Key words: Composite materials, Carbon/epoxy, Cross ply laminates, Tensile test, Fatigue strength, Damage, X-ray radiography (CFRP) CFRP (T800H) ( 3631) [0 / 90 ] S [0 /90 ] 2S [0 /90 ] 3S CFRP received 9 September 1998 Structures Division

4 2 736 FRP CFRP CFRP PAN FRP FRP 1 12 FRP PAN 5.6 GPa CFRP 2.2 FRP ASTM D ASTM D 3039/D 3039M 14 CFRP CFRP JIS K ISO ISO FRP DIS FRP DIS ISO JIS 18 CFRP GFRP FRP ISO FRP ASTM D 3479/D 3479M 19 CFRP JIS K ASTM 14 JIS T800H P [0 /90 ] S [0 / 90 ] 2S [0 /90 ] 3S 0.5 mm 1.1 mm 1.7 mm S 2S 3S 500 mm 500 mm MPa ASTM D 3039M JIS K 7073 ISO/DIS mm

5 CFRP 3 C mmd 70 mm E 50 mm 25 mm GFRP ab a b mm 260 mm a mm 260 mm b 10 WE181D MPa GFRP 1.5 mm GFRP AF M MPa 25 mm 220 mm 200 mm kn mm mm DPM-611B X Y WX4422-Z a mm Sa [0 /90 ] S Sb [0 /90 ] S Sa [0 /90 ] 2S Sb [0 /90 ] 2S Sa [0 /90 ] 3S Sb [0 /90 ] 3S

6 4 736 E t GPa s B MPa e max Sa Sb Sa Sb Sa Sb E t E t DP/A m /De Ds/De 1 DPA m De DP Ds Ds s B 2 s B P B /A m 2 P B X SV-100AW X FR X a b X Z n I X Sa /cm /cm /cm Sa 3Sa Sa E t 3

7 CFRP 5 a b

8 6 736 Sa E t a E f V f E m V f 3 E f 294 GPa E m 3.7 GPa V f 57 a E t 85.4 GPa 5.1 s min s max R 0.1 Hz X 5.2 X 90

9 CFRP 7 2Sa 3Sa

10 a a b X 10 11

11 CFRP 9 12 a 15 3S

12 b 5.3 S N N s max S a b S N

13 CFRP Sa Sb Sa Sb 14a 15b

14 Sa Sb 4 s max A-B log N 4 s max A B N 10 7 s W s B Sa Sb S N A N s B a b B S 2S 3S a b 10 7 s W /s B a b JIS K 7083 s W/s B 2S 3S 0.8 PAN T800H 3631 CFRP [0 / 90 ] S [0 /90 ] 2S [0 /90 ] 3S 10 7 CFRP CFRP S N s W A/s B W s/s B MPa MPa Sa s max log N Sb s max log N Sa max s log N Sb max s log N Sa max s log N Sb max s log N s max =A-B log Ns B W 107 s Sa Sb CFRP J.T.Hartness, R. Y. Kim; A comparative study on fatigue behavior of polyetheretherketon and epoxy with reinforced graphite cloth, 28th National SAMPE Symposium, 1983 pp R. F. Dickson, C. J. Jones, B. Harris; The environmental fatigue behaviour of carbon fibre reinforced polyether ether ketone, J. of Materials Science, pp C. Baron, K. Schulte, H. Harig; Influence of fibre and matrix failure strain on static and fatigue properties of carbon fibre-reinforced plastics, Composites Science and Technology, pp K. Schulte, E. Reese, T. W. Chou; Fatigue behaviour and damage development in woven fabric and hybrid fabric composites, ICCM pp C. Baron, K. Schulte; Fatigue damage response of CFRP with toughened matrices and improved fibres, ICCM-6, 1987 pp O. Konur, F. L. Matthews; Effect of the properties of the constituents on the fatigue performance of composites: a review, Composites, pp S. Cler; Fatigue properties of composite materials autoclave processed from carbon-epoxy woven fabric prepregs, 36th International SAMPE Symposium, 1991 pp

15 CFRP C. Henaff-Gardin, M. C. Lafarie-Frenot; Fatigue behaviour of thermoset and thermoplastic cross-ply laminates, Composites, pp CFRP A pp M. Kawai, M. Morishita, K. Fuzi, T. Sakurai, K. Kemmochi; Effect of matrix ductility and progressive damage on fatigue strength of unnotched and notched carbon fiber plain woven roving fabric laminates, Composites: Part A 27A 1996 pp FRP TR , 1996 pp ASTM D ; Standard test method for tensile properties of fiber-resin composites, American society for testing and materials ASTM D 3039/D 3039M-95a; Standard test method for tensile properties of polymer matrix composite materials, American society for testing and materials JIS K ISO/DIS 527 Part 4; Plastics - Determination of tensile properties. Part 4: Test conditions for isotorpic and orthotropic fiber-reinforced plastic composites, International organization for standardization ISO/DIS 527 Part 5; Plastics - Determination of tensile properties. Part 5: Test conditions for unidirectional fiberreinforced plastic composites, International organization for standardization JIS K ASTM D 3479/D 3479M-96; Standard test method for tension-tension fatigue of polymer matrix composite materials, American society for testing and materials JIS K [0 /90 ] S Sa E t GPa s B MPa e max s max MPa s max /s B N [0 /90 ] S Sb Et GPa s B MPa e max s max MPa s max /s B N

16 [0 /90 ] 2S 2Sa E t GPa s B MPa e max s max MPa s max /s B N [0 /90 ] 2S 2Sb E t GPa s B MPa e max s max MPa s max /s B N

17 CFRP 15 [0 /90 ] 3S 3Sa E t GPa s B MPa e max s max MPa s max /s B N [0 /90 ] 3S 3Sb E t GPa s B MPa e max s max MPa s max /s B N

18

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