25 Creep I - 530.352 Materials Selection Lecture #25 High...

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Unformatted text preview: 530.352 Materials Selection Lecture #25 High Temperature Creep Monday November 14 th , 2005 High Temperature Creep Thermally activation deformation at constant stress over time. creep = f ( T, , t ) Creep is slow, continuous deformation with time. . What is a high temperature ? RT ~ 298K, T hair drier ~ ?K, T car engine ~ ?K T jet engine ~ ?K, T light bulb ~?K, T fusion reactor ~ ?K What is a long time ? Light bulbs ?, Jet engines ?, Automobile engines ?, Steam pipes ? What is high temperature ?? 300K? , 500K ?, 1,000K ?, 2,000K ? Applications : RT ~ 298K, T hair drier ~ ??? 500K, T car engine ~ 900K T jet engine ~ 1,300K, T light bulb ~2,300K, T fusion reactor ~ ??? For metals and ceramics : For polymers : high T > 0.5 T melting high T > T g What is high temperature ?? 300K? , 500K ?, 1,000K ?, 2,000K ? Applications : RT ~ 298K, T hair drier ~ 500K, T car engine ~ ??? 900K T jet engine ~ 1,300K, T light bulb ~2,300K, T fusion reactor ~ ??? For metals and ceramics : For polymers : high T > 0.5 T melting high T > T g What is high temperature ?? 300K? , 500K ?, 1,000K ?, 2,000K ? Applications : RT ~ 298K, T hair drier ~ 500K, T car engine ~ 900K T jet engine ~ ??? 10K, T light bulb ~2,300K, T fusion reactor ~ ???...
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25 Creep I - 530.352 Materials Selection Lecture #25 High...

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