Creep: Generalised Blackburn Creep
Description
Defines creep data parameters according to the generalised Blackburn creep law.
The generalised Blackburn creep law offers an expression that provides a finite initial creep strain rate that decays slowly with time.
Toolbar Functions
See LAYOUTS: Creep.
COEFFICIENTS
C1 is a creep strain coefficient.
C2 is a creep stress coefficient.
C3 is a creep coefficient.
C4 is a creep stress coefficient.
C5 is a creep stress index.
C6 is a creep coefficient.
C7 is a creep stress coefficient.
PARAMETERS
Time Unit (t)
The unit of time in which the coefficients are specified.
Hardening
The creep hardening rule determines whether the creep strain rate is a function of the elapsed time or the amount of creep strain.
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Time
With this rule, the creep strain rate is calculated based on the elapsed time.
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Strain
With this rule, the creep strain rate is calculated based on the amount of creep strain in the model. Experimental evidence suggests that the strain hardening rule is to be favoured over the time hardening rule.
If Cyclic is set, extra auxiliary rules are used in conjunction with the strain hardening rule in order to better model stress reversal situations. Such modified strain hardening rule should be used for cyclic loading situations only.
Temperature
Not applicable to this creep law.
See Also