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Failure Mechanisms
Creep Diagrams

· The diagram represents the stress-temperature behavior of a material and shows the mechanisms controlling creep deformation in various (σ T ) regions.
· The stress is normalized by the shear modulus of the sample (G), and the temperature is normalized by the melting temperature (Tm ) .
· The reduced temperature range is: 0 < (T/Tm ) < 1.
From: Courtney, "Mechanical Behavior of Materials," 
McGraw Hill (1990)
· The stress range upper limit, σ4, is 0.1G, the "theoretical" material strength.