Week15Ch16_18

Week15Ch16_18 - Chapter 16,18: Composite and Electrical...

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Chapter 16,18: Composite and SUES TO ADDRESS Electrical Properties ISSUES TO ADDRESS. .. What are the classes and types of composites ? • How do we estimate composite stiffness & strength? How are electrical conductance and resistance characterized ? How do we estimate composite stiffness & strength? What are the physical phenomena that distinguish conductors, semiconductors, and insulators? For metals, how is conductivity affected by imperfections, T , and deformation? For semiconductors how is conductivity affected Chapter 18 - 1 For semiconductors, how is conductivity affected by impurities (doping) and T ?
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Composites • Combine materials with the objective of getting a more desirable combination of properties – Ex: get flexibility & weight of a polymer plus the strength of a ceramic • Principle of combined action ixture gives “averaged” properties – Mixture gives averaged properties Chapter 18 - 2
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Terminology/Classification Composites : -- Multiphase material w/significant roportions of each phase proportions of each phase. Matrix : -- The continuous phase urpose is to: -- Purpose is to: - transfer stress to other phases - protect phases from environment lassification: MMC CMC PMC ispersed phase -- Classification: MMC, CMC, PMC metal ceramic polymer Dispersed phase : -- Purpose: enhance matrix properties. MMC : increase σ y , TS , creep resist. CMC : increase Kc Chapter 18 - 3 PMC : increase E , σ y , TS , creep resist. -- Classification: Particle , fiber , structural
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Composite Survey Influencing factors of the ispersed phase: d spe sed p ase: a) concentration, b)size, c)shape, d)distribution, orientation Composites e)orientation. Particle-reinforced Fiber-reinforced Structural Large- particle Dispersion- strengthened Continuous (aligned) Discontinuous (short) Laminates Sandwich panels Chapter 18 - 4 Aligned Randomly oriented
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Composite Survey: Particle-I Examples: Particle-reinforced Fiber-reinforced Structural p Adapted from Fig. 10.19, Callister 7e . (Fig. 10.19 is copyright United tates Steel - Spheroidite steel matrix: ferrite ( α ) (ductile) particles: cementite (Fe 3 C) States Steel Corporation, 1971.) (brittle) 60 µ m Adapted from Fig. 16.4, Callister 7e . - WC/Co matrix: particles: , (Fig. 16.4 is courtesy Carboloy Systems, Department, General Electric Company.) cemented carbide cobalt (ductile) WC (brittle, hard) V m : 0 5 vol%! 00 10-15 vol%! 600 µ m Adapted from Fig. 16.5, Callister 7e . (Fig. 16.5 is courtesy Goodyear Tire and - Automobile res matrix: rubber particles: Chapter 18 - 5 Rubber Company.) tires (compliant) C (stiffer) 0.75 µ m
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Composite Survey: Particle-II lastic modulus of composites: Particle-reinforced Fiber-reinforced Structural Elastic modulus , E c , of composites: -- two approaches. cm m upper limit: E = VE + V p E p “rule of mixtures” Pa) Adapted from Fig. 16.3, Callister 7e . (Fig. 16.3 is from R.H. Krock, ASTM Proc , Vol. 63, 1963.) lower limit: 1 = V m + V p Data: Cu matrix w/tungsten 250 300 350 E (GPa) E c E m E p particles 02 0 4 0 6 0 8 0 1 0 0 150 200 vol% tungsten (Cu) (W) Chapter 18 - 6
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Composite Survey: Fiber-I ibers very strong Particle-reinforced Fiber-reinforced Structural Fibers very strong
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This note was uploaded on 09/21/2010 for the course EGN 3365 taught by Professor Jiuhuachen during the Spring '09 term at FIU.

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Week15Ch16_18 - Chapter 16,18: Composite and Electrical...

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