8.0 - creep creep creep strain rate decreases strain rate...

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Creep is the plastic deformation of a material at high temperatures ( 2245 0.4T m ) over long periods of time. The four variables of strain, time, temperature, and stress level make creep difficult to quantify. Typical experimental data gives “creep curves” for a constant temp and stress level: rupture creep strain Primary Secondary Tertiary (transient) (steady state)
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Unformatted text preview: creep creep creep strain rate decreases strain rate is constant strain rate increases due to increase in true stress (strain hardening (there is a balance between competing (necking, voids, grain boundary seperation) & dislocation forces of strain hardening & ease of slip climb) due to high T and recovery) instantaneous deformation t im...
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8.0 - creep creep creep strain rate decreases strain rate...

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