MIT16_982s09_lec02

MIT16_982s09_lec02 - MIT OpenCourseWare http/ocw.mit.edu...

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MIT OpenCourseWare http://ocw.mit.edu 16.982 Bio-Inspired Structures Spring 2009 For information about citing these materials or our Terms of Use, visit: http://ocw.mit.edu/terms .
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ISSUES TO ADDRESS ISSUES TO ADDRESS. .. • What are the classes and types of composites ? Why are composites used instead of metals, ceramics, or polymers? How do we estimate composite stiffness & strength? What are some typical applications?
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Composites : woven --Multiphase material w/significant fibers pr propor oportions tions of of ea ea. phase. Matrix : --The continuous phase --Pur Purpose is pose is to to: transfer stress to other phases cross protect phases from environment section view PM --Classif --Classifica ication: tion: MMC MMC, CMC, PMC metal ceramic polymer Disper Dispersed sed phase phase : --Purpose: enhance matrix properties. MMC: increase V y , TS, creep resist. CMC: increase Kc PMC: increase E, V y , TS, creep resist. --Classification: Particle , fiber , structural
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COMPOSITE SURVEY: Particle-I Particle-reinforced Fiber-reinforced Structural Examples: -Spheroidite matrix: particles: Adapted from Fig. ferrite ( steel 60 P m D ) cementite 10.10, Callister 6e . (Fe 3 C) (Fig. 10.10 is (ductile) copyright United (b rittl e) States Steel (b ittl ) States Steel Corporation, 1971.) -WC/Co matrix: Adapted from Fig. particles: 16.4, . cobalt WC (Fig. 16.4 is cemented (ductile) (brittle, courtesy Carboloy Systems, carbide V m : hard) Department, General Electric 10-15vol%! 10-15vol%! 600 600 P m C m Company.) ) Adapted from Fig. -Automobile matrix: 16.5, . particles: (Fig. 16.5 is tires rubber C courtesy C y Good (compliant) year (stiffer) Tire and Rubber Company.) 0.75 P m
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COMPOSITE SURVEY: Particle-II Particle-reinforced
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MIT16_982s09_lec02 - MIT OpenCourseWare http/ocw.mit.edu...

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