ch8.2-S09 - Chapter 8: Deformation and Strengthening...

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MY2100 – Ch 8, Part 2, Slide 1 Chapter 8: Deformation and Strengthening Mechanisms structure processing properties Performance ISSUES TO ADDRESS. .. What controls the strength of ceramics? What controls the strength of polymers?
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MY2100 – Ch 8, Part 2, Slide 2 Ceramics Ceramics do not yield at low temperatures - they are brittle because dislocation mobility is drastically limited. Strength is controlled by defects and fracture toughness, which will be discussed in the next chapter. High temperatures: Ceramics can yield. Crystalline ceramics’ strength is controlled by dislocations or diffusion (just like metals). Glasses flow like viscous liquids. (A glass is really an undercooled liquid.) Viscosity is affected by temperature and chemical composition. Viscous flow depends on strain rate and time.
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MY2100 – Ch 8, Part 2, Slide 3 Viscosity Characteristic property of viscous flow τ = η dv/dy = η ∆ v /∆ y
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MY2100 – Ch 8, Part 2, Slide 4 Strength of polymers
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This note was uploaded on 03/16/2011 for the course MY 2100 taught by Professor Staff during the Spring '08 term at Michigan Technological University.

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ch8.2-S09 - Chapter 8: Deformation and Strengthening...

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