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Comprehensive Overview of Composite Materials: Types, Properties, and Applications

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15 diapositives · 284 Views · Sep 13, 2014

This document delves into the intricacies of composite materials, including metal matrix composites (MMCs), ceramic matrix composites (CMCs), and polymer matrix composites (PMCs). It highlights the essential roles of the matrix and dispersed phases, such as fibers and particulates, in enhancing mechanical properties like strength, creep resistance, and fracture toughness. The various examples provided, including the use of specific polymers and carbon fibers, offer insight into their applications in industries such as aerospace and automotive. Understand how different combinations and configurations impact the performance of these materials.

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  1. No problem is too small or too trivial if we can really do something about it 
 – Feyman

  2. H2C-C-C{-O- -C- -O-}nC-C-CH2 H H H H-C-H H-C-H O O H H H H2N-R-NH2 hardener epoxy Prepregs Some specific polymers

  3. angular WC fragments Co matrix phase Composites - overview Example - carbide tools (previously discussed)

  4. Composites - overview Artificial combination of matrix phase & dispersed phase Matrix: metal, alloy ceramic mat'l polymer Dispersed phase: particulate fiber

  5. Works like precipitation hardening Composites - metal matrix composites (MMCs) Particulates: ThO2-dispersed Ni (TD Ni) sintered Al powder (SAP) - except strengthening maintained at hi T Improves: strength creep resistance hi T corrosion resistance

  6. Matrix mat'ls Composites - metal matrix composites (MMCs) Fibers: Conts - C, SiC, B, Al2O3 Disconts - C, Al2O3 , SiC whiskers May get rxn betwn phases at hi T

  7. Matrix Composites - ceramic matrix composites (CMCs) Particulates, fibers: SiC, B, Al2O3 , C, SiC & Si3N4 whiskers Improve fracture toughness: slow crack growth deflect crack tips redistribute stresses around crack tips bridge crack tips

  8. Composites - polymer matrix composites (PMCs) Fibers: mainly - glass (GFRPs), carbon (CFRPs), aramid, others - B, SiC, Al2O3

  9. Composites - polymer matrix composites (PMCs) Matrix

  10. Composites - polymer matrix composites (PMCs) Very common - polyesters, vinyl esters

  11. Composites Role of matrix in FR composites: a. transfer stresses betwn fibers b. provide barrier to environment c. protect fibers Matrix/fiber bond: matrix must wet fiber physical & chemical bond desirable mechanical interlocking Fibers frequently coated w/ coupling agent

  12. non-coupled coupled Composites

  13. Composites Fibers - variables amount fiber length distribution orientation Fiber orientation can be random aligned intermediate

  14. Assignment: Review today's classnotes a. epoxies b. composites - matrix, dispersed phase c. MMCs - strengthening mechanism d. CMCs - fracture toughness improves e. PMCs - fibers f. matrix/fiber bond Read pp. 481-507, 527-538

  15. Composites - polymer matrix composites (PMCs) Role of matrix in FR composites: a. transfer stresses betwn fibers b. provide barrier to environment c. protect fibers Slow crack growth deflect crack tips redistribute stresses around crack tips bridge crack tips