EGN3365-16

EGN3365-16 - Chapter 16: Composite Materials ISSUES TO...

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ISSUES TO ADDRESS. .. • What are the classes and types of composites ? • Why are composites used instead of metals, Chapter 16: Composite Materials Chapter 16 - 1 ceramics, or polymers? • What are some typical applications?
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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 structure materials for aircraft engine: low densities, strong, stiff, abrasion and impact resistant and orrosion resistant. Chapter 16 - 2 corrosion resistant. GE engine: http://www.geae.com/education/theatre/genx/ http://www.geae.com/education/theatre/ge90/ Principle of combined action – Mixture gives “averaged” properties better property combinations are fashioned by the combination of 2 or more distinct materials.
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Composite is considered to be any multiphase materials that exhibits a significant proportion of the properties of both constituent phases such that a better combination of properties is realized. Chapter 16 - 3 Schematic representations of the various geometrical and spatial characteristics of particles of the dispersed phase that may influence the properties of composites: (1) concentration, (b) size, © shape, (d) distribution, and (e) orientation.
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Composites : -- Multiphase material w/significant proportions of each phase. Matrix : -- The continuous phase -- Purpose is to: - transfer stress to other phases Terminology/Classification woven fibers cross 0.5mm Chapter 16 - 4 Dispersed phase : -- Purpose: enhance matrix properties. MMC : increase σ y , TS , creep resist. CMC : increase Kc PMC : increase E , σ y , TS , creep resist. -- Classification: Particle , fiber , structural - protect phases from environment -- Classification: MMC, CMC, PMC metal ceramic polymer 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. section view 0.5mm
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Composite Survey Large- particle Dispersion- strengthened Particle-reinforced Continuous (aligned) Discontinuous (short) Fiber-reinforced Laminates Sandwich panels Structural Composites Chapter 16 - 5 Aligned Randomly oriented Adapted from Fig. 16.2, Callister 7e . 10-100nm
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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 ( α ) (ductile) particles: cementite (Fe 3 C) (brittle) 60 μ m Particle-reinforced Fiber-reinforced Structural Chapter 16 - 6 Adapted from Fig. 16.4, Callister 7e . (Fig. 16.4 is courtesy
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This note was uploaded on 12/03/2011 for the course EGN 3365 taught by Professor Jiuhuachen during the Fall '09 term at FIU.

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EGN3365-16 - Chapter 16: Composite Materials ISSUES TO...

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