Respuesta :
An equilibrium condition of steady-state increase of strain over a long period of time at constant stress and temperature is secondary creep.
Creep is the under stress, time-dependent permanent deformation that takes place; for most materials, it only matters at high temperatures.
The secondary creep rate, which denotes plastic flow in which strain hardening and strain softening are in a state of dynamic equilibrium, is defined by the hyperbolic sine relationship shown below. Since dislocation structure and grain size have reached equilibrium in the secondary, or steady-state, creep, the strain rate is constant. The steady-state strain rate is referred to in equations that produce a strain rate. The creep mechanism determines how this rate is affected by stress.
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