11.2 - E45 Lecture 11/2/09 About failures and repairs of...

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Unformatted text preview: E45 Lecture 11/2/09 About failures and repairs of engineered structures: 1. Never make a repair until you have first determined the cause of failure bout failures and repairs of engineered structures: Never make a repair until you have first determined the cause of failure Determine the risk of that the repair will fail by a new mechanism that the original structure was not susceptible to bout failures and repairs of engineered structures: Never make a repair until you have first determined the cause of failure Determine the risk of that the repair will fail by a new mechanism that the original structure was not susceptible to Inspect the entire structure 5 Room temperature values (Ohm-m)-1 = ( - m)-1 Selected values from Tables 12.1, 12.3, and 12.4, Callister & Rethwisch 3e. Conductivity: Comparison Silver 6.8 x 10 7 Copper 6.0 x 10 7 Iron 1.0 x 10 7 METALS conductors Silicon 4 x 10-4 Germanium 2 x 10 GaAs 10-6 SEMICONDUCTORS semiconductors Polystyrene <10-14 Polyethylene 10-15...
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11.2 - E45 Lecture 11/2/09 About failures and repairs of...

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