lecture10B - Chapter Chapter 16 Composite Materials 1...

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Chapter Chapter 16 16 Composite Materials Chapter 16 - 1
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i t t il Composite Composite Materials Materials ISSUES TO ADDRESS. .. What are the classes and types of composites ? Why are composites used instead of metals, eramics or polymers? ceramics, or polymers? How do we estimate composite stiffness & strength? What are some typical applications? Chapter 16 - 2
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Composites ombine materials with the objective of getting a 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 rinciple of combined action Principle of combined action – Mixture gives “averaged” properties Chapter 16 - 3
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Terminology/Classification Composites : -- Multiphase material w/significant roportions of each phase woven fibers proportions of each phase. Matrix : -- The continuous phase urpose is to: 5 m -- Purpose is to: - transfer stress to other phases - protect phases from environment lassification: MMC CMC PMC cross section iew 0.5mm ispersed phase -- Classification: MMC, CMC, PMC metal ceramic polymer view .5 m Dispersed phase : -- Purpose: enhance matrix properties. MMC : increase y , TS , creep resist. CMC : increase Kc Chapter 16 - 4 PMC : increase E , y , TS , creep resist. -- Classification: Particle , fiber , structural
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Composite Survey Composites Particle-reinforced Fiber-reinforced Structural Large- particle Dispersion- strengthened Continuous (aligned) ligned andomly Discontinuous (short) Laminates Sandwich panels Aligned Randomly oriented Chapter 16 - 5
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Composite Survey: Particle Composite Survey: Particle-I Examples: Particle-reinforced Fiber-reinforced Structural p - Spheroidite steel matrix: ferrite ( ) (ductile) particles: cementite (Fe 3 C) (brittle) 60 m - WC/Co matrix: particles: cemented carbide cobalt (ductile) WC (brittle, hard) V m : 0 5 vol%! 00 10-15 vol%! 600 m - Automobile res matrix: rubber particles: Chapter 16 - 6 tires (compliant) C (stiffer) 0.75 m
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Composite Survey: Particle Composite Survey: Particle-II II Particle-reinforced Fiber-reinforced Structural Concrete – gravel + sand + cement - Why sand and gravel? Sand packs into gravel voids einforced concrete Reinforced concrete - Reinforce with steel rerod or remesh - increases strength - even if cement matrix is cracked restressed concrete mesh under tension during setting of Prestressed concrete - remesh under tension during setting of concrete. Tension release puts concrete under compressive force - Concrete much stronger under compression.
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lecture10B - Chapter Chapter 16 Composite Materials 1...

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