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· The time-dependent behavior
of material strain as a function of its temperature and the applied stress
is shown in the diagram.
· At low temperatures,
T < 0.4 Tm ,the plastic creep
strain stabilizes after an
initial increase and the component is stable.
· As either the temperature or the stress
is increased the material
no longer stabilizes but continues to deform with time. Following a linear
'secondary creep' period the sample enters the tertiary stage, necks
locally, and fails
by ductile
fracture.
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