L7 Energy and Materials F10

L7 Energy and Materials F10 - Energy and Materials...

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Energy and Materials Interaction of energy and matter, Thermal Conductivity, Thermal Expansion, F(r), E(r), Bond Energy Curves Last Edited 10/19/10 10:48 am
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Reading MTE 207 Callister, Web chapter 19 MTE 208 Custom Textbook, Chapter 6 Skip section on Heat Capacity
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Atomic Energy Levels vs Bands E 2 E 1 E 3
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How can we add energy to materials?
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Interaction of Light and Matter: Light Absorption and Emission Visible: e- transitions in the visible range often d-electrons Energy bands X-rays: e- transitions to lower energy states IR: bond vibrations
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Photon Energy Electromagnetic Energy (Light) hc=1239.67 eV-nm “1234” eV-nm λ ν hc h E photon = =
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Example Draw the band diagram for window glass, and make an estimate of E g
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What happens when we heat materials? Energy is absorbed Atomic motion increases Materials may soften, creep, elongate Materials may melt Materials may oxidize or decompose
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What happens when we cool materials? Atomic motion decreases Materials may become brittle Materials may become less flexible or ductile Challenger o-rings ... allowing pressurized hot gas from within the solid rocket motor to reach the outside and impinge upon the adjacent SRB attachment hardware and external fuel tank . (Wikipedia)
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Thermal Conductivity Heat flows from High to Low temperature dx dT k q = Heat flux [W/m 2 ] W=J/s Thermal Conductivity [W/m·K] Temperature Gradient [K/m] = energy gradient
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This note was uploaded on 11/28/2010 for the course MTE 209 taught by Professor Tanyafalten during the Fall '09 term at Cal Poly Pomona.

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L7 Energy and Materials F10 - Energy and Materials...

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