Chapter 16 - ANNOUNCEMENTS - 4/24 Reading: Chapter 16...

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ANNOUNCEMENTS - 4/24 Reading: Chapter 16 Homework #10 due today Final Exam: 10:15-12:15, Tuesday, May 8 Open textbook and lecture notes Chapter 16 - 1
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Composites Combine materials with the objective of obtaining a more desirable combination of properties – Ex: get flexibility & weight of a polymer plus the strength of a ceramic Principle of combined action – Mixture gives “averaged” properties Chapter 16 - 2
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brake disk (SiC-Al) Engine liner (Al 2 O 3 -Al) Al 2 O 3 -ZrO 2 ceramic composite Laminated armor Chapter 16 - 3
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Terminology/Classification Composites : -- Multiphase material w/significant proportions of each phase. woven fibers cross section view 0.5mm 0.5mm Matrix : The continuous phase Purpose is to: - transfer load to other phases - protect phases from environment Classification: MMC, CMC, PMC metal ceramic polymer Dispersed phase : Purpose: enhance matrix properties. MMC : increase σ y , TS , creep resistance CMC : increase K c PMC : increase E , σ y , TS , creep resistance Classification: Particle , fiber , structural Reprinted with permission from D. Hull and T.W. Clyne, An Introduction to Composite Materials , 2nd ed., Cambridge University Press, New York, 1996, Fig. 3.6, p. 47. Chapter 16 - 4
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Classification of Composites Large- particle Dispersion- strengthened Particle-reinforced Continuous (aligned) Aligned Randomly oriented Discontinuous (short) Fiber-reinforced Laminates Sandwich panels Structural Composites Adapted from Fig. 16.2, Callister 7e . Chapter 16 - 5
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Composite Survey: Particle - I Particle-reinforced Fiber-reinforced Structural Adapted from Fig. 10.19, Callister 7e . (Fig. 10.19 is copyright United States Steel Corporation, 1971.) - Spheroidite steel matrix: ferrite ( α ) (ductile) particles: cementite (Fe 3 C) (brittle) 60 µ m Chapter 16 - 6 Adapted from Fig. 16.4, Callister 7e . (Fig. 16.4 is courtesy Carboloy Systems, Department, General Electric Company.) - WC/Co cemented carbide (cutting tool) matrix: cobalt (ductile) particles: WC (brittle, hard) V m : 10-15 vol%! 600 µ m Adapted from Fig. 16.5, Callister 7e . (Fig. 16.5 is courtesy Goodyear Tire and Rubber Company.) - Automobile tires matrix: rubber (compliant) C particles: (stiffer) 0.75 µ m
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Composite Survey: Particle - II Particle-reinforced Fiber-reinforced Structural Concrete – gravel + sand + cement - Why sand and gravel? Sand packs into gravel voids to increase density Reinforced concrete - Reinforce with steel rerod or remesh - increases strength and flexibility- even if cement matrix is cracked Prestressed concrete - remesh under tension during setting of concrete. Tension release puts concrete under compressive force
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Chapter 16 - ANNOUNCEMENTS - 4/24 Reading: Chapter 16...

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