12.38. Calculate the density of the Kevlar fiber-reinforced epoxy composite in Table 12.7. The density of Kevlar is 1.44

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12 38 Calculate The Density Of The Kevlar Fiber Reinforced Epoxy Composite In Table 12 7 The Density Of Kevlar Is 1 44 1 (49.62 KiB) Viewed 55 times

12 38 Calculate The Density Of The Kevlar Fiber Reinforced Epoxy Composite In Table 12 7 The Density Of Kevlar Is 1 44 2 (39.97 KiB) Viewed 55 times

12 38 Calculate The Density Of The Kevlar Fiber Reinforced Epoxy Composite In Table 12 7 The Density Of Kevlar Is 1 44 3 (39.97 KiB) Viewed 55 times

12.38. Calculate the density of the Kevlar fiber-reinforced epoxy composite in Table 12.7. The density of Kevlar is 1.44 Mg/m3 and of epoxy is 1.1 Mg/m?. 12.39. In a contemporary commercial aircraft, a total of 0.25 m3 of its exterior surface is constructed of a Kevlar/epoxy composite, rather than of a conven- tional aluminum alloy. Calculate the mass savings using the density calculated in Problem 12.38 and approximating the alloy density by that of pure aluminum.
46 TABLE 12.7 Mechanical Properties of Common Composite Systems Flexual Compressie Percent TS strength strength elongation KO Class IMPa (ksi) IMPa (ks) [MPa (kst] IMPa (ksi)! at failure (MPa) Polymer-matrix E-glass (733 vol %) in epoxy (parallel 56 x 108 x 10 1.640 (238) 29 4260 loading of continuous Gibers) Also, whiskers (14 vol %) in epoxy 41 x 106 x 10 779 (113) C (67 vol %) in epoxy (parallel loading 221 x 10 (32 x 10 1.206 (175) Kevlar(82 vol %) in epoxy (parallel 86 x 10(12 x 10° 1.517 (220) loading B (70 vol %) in epoxy (parallel loading 210-260 x 10 1,400-2,100 (200-300 of continuous filaments) (30-40 x 10 Metal matrix Al Os (10 vol ) dispersion 330 (48) strengthened aluminum W (50 vol %) in copper (parallel 260 x 10°38 x 10 1.100 (160) loading of continuous filaments) W particles (50 vol %) in copper 190 x 1027 x 10) 380 (55) Ceramio-matrix Sic whiskers in Ahos 800 (116) 8.7 Sic fibers in SIC 750 (109) 25.0 Sic whiskers in reaction bonded SINE 900 (131) 200 Souto Data from MR Akhy and D. Home Enceine Materiale Art In Their Properties and Applications, Pergamont Prew, Inc. Flon, NY, 1991 1. R. H. Krock Mesem Composite Materials. Add Wesley Posing Co. Ine, Heading MA, 1967 *Abga boronam - 1 1 1 1