TABLE 4.2 Tensile Strengths and First-Ply Failure(FPF)Stresses in High-Strength Carbon-Epoxy Symmetric Laminates Estimated FPF Stress, Tensile Initial Modulus, Tensile UTS,MPa (ksi) MPa (ksi) GPa(Msi) Strain(%a)】 Laminate Resin 1 Resin 2 Resin 1 Resin 2 [O]s 1378(200) 1378(200) 一 一 151.6(22) 0.3 [90s 413(6 82.7(12) 8.96(1.3) 0.5-0.9 [±45s 137.8(20) 89.613) 89.6(13) 89.6(13) 17.2(2.5) 1.5-4.5 [0/90Ls 447.8(65) 757.9110) 413.4(60) 689(100) 82.7(12) 0.5-0.9 [02/±451s 599.4(87) 689(110) 592.5(86) 689(100) 82.7(12) 0.8-0.9 [0/±601s 461.6(67) 551.2(80) 323.8(47) 378.9(55) 62(9) 0.8-0.9 [0/90/±45s 385.8(56) 413.4(60) 275.6(40) 413.4(60) 55.1(8) 0.8-0.9 Source:Adapted from Freeman,W.T.and Kuebeler,G.C.,Composite Materials:Testing and Design (Third Conference),ASTM STP,546,435,1974. Resin 2 is more flexible than resin I and has a higher strain-to-failure. AS carbon-epoxy 8 11.6 [±15s 6 8.7 4 5.8 [仕30ls [±451s 2.9 [±60ls 0 [9o 0 0 12 16 20 Strain (10-3) FIGURE 4.10 Typical tensile stress-strain diagrams for angle-ply laminates.(Adapted from Lagace,P.A.,AIAA J.,23,1583,1985.) 2007 by Taylor&Francis Group.LLC.TABLE 4.2 Tensile Strengths and First-Ply Failure (FPF) Stresses in High-Strength Carbon–Epoxy Symmetric Laminatesa UTS, MPa (ksi) Estimated FPF Stress, MPa (ksi) Tensile Modulus, GPa (Msi) Initial Tensile Strain (%) Laminate Resin 1 Resin 2 Resin 1 Resin 2 [0]S 1378 (200) 1378 (200) — — 151.6 (22) 0.3 [90]S 41.3 (6) 82.7 (12) — — 8.96 (1.3) 0.5–0.9 [±45]S 137.8 (20) 89.6 (13) 89.6 (13) 89.6 (13) 17.2 (2.5) 1.5–4.5 [0=90]S 447.8 (65) 757.9 (110) 413.4 (60) 689 (100) 82.7 (12) 0.5–0.9 [02=±45]S 599.4 (87) 689 (110) 592.5 (86) 689 (100) 82.7 (12) 0.8–0.9 [0=±60]S 461.6 (67) 551.2 (80) 323.8 (47) 378.9 (55) 62 (9) 0.8–0.9 [0=90=±45]S 385.8 (56) 413.4 (60) 275.6 (40) 413.4 (60) 55.1 (8) 0.8–0.9 Source : Adapted from Freeman, W.T. and Kuebeler, G.C., Composite Materials: Testing and Design (Third Conference), ASTM STP, 546, 435, 1974. a Resin 2 is more flexible than resin 1 and has a higher strain-to-failure. AS carbon−epoxy [±15]S [±30]S [±45]S [±60]S Stress (100 MPa) Stress (10,000 psi) [90] 0 0 2 4 6 8 4 8 12 Strain (10−3) 16 20 0 2.9 5.8 8.7 11.6 FIGURE 4.10 Typical tensile stress–strain diagrams for angle-ply laminates. (Adapted from Lagace, P.A., AIAA J., 23, 1583, 1985.)
2007 by Taylor & Francis Group, LLC