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Definition of creep: time-dependent strain occurring under stress. The creep strain occurring at a diminishing rate is called primary or transient creep; that occurring at a minimum and almost constant rate, secondary or steadyrate creep; that occurring at an accelerating rate, tertiary creep.
> Definition of creep rate: the slope of the creep-time curve at a given time determined from a Cartesian plot.
> Definition of creep-rupture strength: the stress that will cause fracture in a creep test at a given time in a specified constant environment.
Also known as stress-rupture strength.
> Definition of creep strain: the time-dependent total strain (extension plus initial gage length) produced by applied stress during a creep test.
> Definition of creep strength: the stress that will cause a given creep strain in a creep test at a given time in a specified constant environment.
> Definition of creep stress: the constant load divided by the originai cross-sectional area of the specimen.
Creep is one of the cause that determine a permanent distortion. |
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