19creep - Creep Creep is slow plastic extension (strain) at...

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Creep Creep is slow plastic extension (strain) at elevated temperatures (T ~> 0.3 melting T) and stress. Typical strain vs time at elevated temperature and stress is: T2 stage I: primary creep: rapid initial deformation stage II: secondary creep: a.k.a. III II I time minimum creep rate d ε /dt X rupture T1<<T2 steady state creep: constant strain rate designated "minimum strain rate" stage III: tertiary creep: reduction in cross section eventually leading to fracture strain ε Typical creep data is usually shown as stress vs time to rupture, 0.5% strain, and 0.2% strain for a given temperature. A set of curves derived manually from NACA TN 4112 Generalized Master Curves for Creep and Rupture, Heimerl and McEvily Oct 1957 (Aero Library) for Aluminum 2024-T3 alloy plate is shown: NACA TN 4112 data creep data shown as stress (ksi) vs time (hours) parameterized by temperature - includes rupture, 0.5% strain and 0.2% strain Creep for Aluminum 2024-T3 alloy sheet 100 0.1 1 10 100 1 . 10
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This note was uploaded on 02/24/2012 for the course MECHANICAL 2.611 taught by Professor Davidburke during the Fall '06 term at MIT.

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19creep - Creep Creep is slow plastic extension (strain) at...

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