Chapter 16- Composite Materials

Chapter 16- Composite Materials - Chapter 16 - 1 ISSUES TO...

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Unformatted text preview: Chapter 16 - 1 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? Chapter 16: Composite Materials Chapter 16 - 2 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 Mixture gives averaged properties Chapter 16 - 3 Composites Classification Large- particle Dispersion- strengthened Particle-reinforced Continuous (aligned) Aligned Random ly oriented Discontinuous (short) Fiber-reinforced Lami nates Sandwi ch panels Structural Comp osites Adapted from Fig. 16.2, Callister 7e . Chapter 16 - 4 Composites :-- Multiphase material w/significant proportions of each phase. Dispersed phase :-- Purpose: enhance matrix properties. MMC : increase y , TS , creep resist. CMC : increase Kc PMC : increase E , y , TS , creep resist.-- Classification: Particle , fiber , structural Matrix :-- The continuous ductile soft phase-- Purpose is to:- transfer stress to other phases- protect phases from environment-- Classification: MMC, CMC, PMC metal ceramic polymer Terminology/Classification Chapter 16 - 5 Composite Survey: Particle-I Examples: Adapted from Fig. 10.19, Callister 7e . (Fig. 10.19 is copyright United States Steel Corporation, 1971.)- Spheroidite steel matrix: ferrite ( ) (ductile) particles: cementite (Fe 3 C) (brittle) 60 m Adapted from Fig. 16.4, Callister 7e . (Fig. 16.4 is courtesy Carboloy Systems, Department, General Electric Company.)- WC/Co cemented carbide matrix: cobalt (ductile) particles: WC (brittle, hard) V m : 10-15 vol%! 600 m Adapted from Fig. 16.5, Callister 7e . (Fig. 16.5 is courtesy Goodyear Tire and Rubber Company.)- Automobile tires matrix: rubber (compliant) particles: C (stiffer) 0.75 m Particle-reinforced Fiber-reinforced Structural Chapter 16 - 6 Composite Survey: Particle-II Concrete gravel + sand + cement- Why sand and gravel? Sand packs into gravel voids Reinforced concrete - Reinforce with steel rerod or remesh- increases strength - even if cement matrix is cracked Prestressed concrete - remesh under tension during setting of concrete. Tension release puts concrete under compressive force- Concrete much stronger under compression. - Applied tension must exceed compressive force Particle-reinforced Fiber-reinforced Structural threaded rod nut Post tensioning tighten nuts to put under tension Chapter 16 - 7 Elastic modulus , E c , of composites:-- two approaches....
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This note was uploaded on 04/02/2008 for the course MSE 200 taught by Professor Wholedepartment during the Spring '08 term at N.C. State.

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Chapter 16- Composite Materials - Chapter 16 - 1 ISSUES TO...

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