Creep Strain Power Law
Creep Strain Power Law
(OP)
I am in great need for the coefficients of the Creep Strain Power Law, viz., the C1, C2, and C2 coefficients in the equation,
Creep Strain = C1*((Uniaxial Stress)^ C2))*(time^ C3)
for AISI 1020 steel at 0F and 300F.
Please help and thank you with much appreciation!
Creep Strain = C1*((Uniaxial Stress)^ C2))*(time^ C3)
for AISI 1020 steel at 0F and 300F.
Please help and thank you with much appreciation!





RE: Creep Strain Power Law
There is no measurable creep deformation at 0 deg F and 300 deg F for structural or low carbon steel. The time dependent properties of creep for low carbon steels is observed at 700 deg F and higher.
RE: Creep Strain Power Law
850F?
RE: Creep Strain Power Law
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If you are looking to evaluate x% of creep deformation in either 10,000 hours or 100,000 hrs as a function of service temperature, there is data available for carbon steel at or above 700 deg F.
RE: Creep Strain Power Law
I am trying to use the creep strain power law to determine the extent of deformation and strain of a shell material subjected to
creep constant stresses at elevated temperatures using FEA ...
RE: Creep Strain Power Law
I doubt that you have a copy of the ASME B&pv Code, Section II, Part D. I will list some of the allowable stress values that are time dependent, meaning creep deformation would most likely govern-
ASME SA 36 structural steel
700 deg F 15.6 Ksi
750 13.0
800 10.8
The stress above are based on the following
(b) At temperatures in the range where creep and
stress rupture strength govern the selection of stresses,
the maximum allowable stress value for all materials
is established by the Committee not to exceed the
lowest of the following:
(1) 100% of the average stress to produce a creep
rate of 0.01%/1000 hr;
(2) 100Favg% of the average stress to cause rupture
at the end of 100,000 hr;
(3) 80% of the minimum stress to cause rupture
at the end of 100,000 hr.
Most likely, (a) above would govern.
RE: Creep Strain Power Law
Sorry, it should be (b)(1), and not (a).
RE: Creep Strain Power Law