AAE352_Summer_Lec29

AAE352_Summer_Lec29 - Andrew J Ritchey [email protected]

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Unformatted text preview: Andrew J. Ritchey [email protected] ARMS B144 765-494-5985 https://engineering.purdue.edu/AAE/Academics/Courses/aae352/2010/summer July 26, 2010 29-1 AAE 352 Summer 2010 As costs have dropped, the range of applications has increased Still too expensive for many applications Currently a world-wide shortage is looming (very cyclic industry) July 26, 2010 29-2 AAE 352 Summer 2010 July 26, 2010 29-3 AAE 352 Summer 2010 Fibers, after manufacturing, come as tows on spools A tow is a bundle of fibers ( filaments ), similar to a yarn Fibers are either left as tows, combined into weaves, or mats, or combined with resin to for pre-impregnated sheets (prepreg) Forms of available fibre (from Kaw, 1997) July 26, 2010 29-4 AAE 352 Summer 2010 Prepreg Laminate Fibre Collimating rake Pull rolls Heat calendering rolls Resin Chill plate Pre-impregnated sheet Lay-up CURE July 26, 2010 29-5 AAE 352 Summer 2010 Fibre content is usually about 60% in tapes and between 50% and 60% in fabrics Ply thickness ranges from 0.127 to 0.254 mm for tapes and up to 1.5 mm for fabrics For tapes, transverse strength is much weaker than the longitudinal strength (matrix); plies are needed in the transverse direction in layup Fibres are available in fabrics in both directions; layup effort is reduced An increasing variety of prepregs and “preforms” becoming available July 26, 2010 29-6 AAE 352 Summer 2010...
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AAE352_Summer_Lec29 - Andrew J Ritchey [email protected]

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