DeanShaw
Mechanical
- Jul 30, 2014
- 2
Hi all,
I have a very limited set of data for a recently developed material that my company is looking at using for high temperature tubes (880 C).
The problem that I am trying to solve is the allowable stress for the material for 100,000 hours to rupture using the Larson-Miller Parameter.
The data for the material I have been given is as follows:
Test Temperature, C | Creep Index, n | A, s-1 Pa-n
880 | 9.64 | 1.6x10-83
900 | 9.68 | 1.8x10-83
950 | 11.55 | 4.2x10-97
The values of A and n parameters correspond to the Norton equation; ε = Aσn
How will I find the Constant in the Larsen-Miller Parameter, C? in the equation; P = T x (log10t + C) x 10-3
The experimetal data is reprented by plotting temperature on a Log Strain Rate over Log Stress graph. I believe that the Constant is found by the intersect of stress on a Log Strain Rate over 1/T graph?
Any help would be greatly appreciated.
I have a very limited set of data for a recently developed material that my company is looking at using for high temperature tubes (880 C).
The problem that I am trying to solve is the allowable stress for the material for 100,000 hours to rupture using the Larson-Miller Parameter.
The data for the material I have been given is as follows:
Test Temperature, C | Creep Index, n | A, s-1 Pa-n
880 | 9.64 | 1.6x10-83
900 | 9.68 | 1.8x10-83
950 | 11.55 | 4.2x10-97
The values of A and n parameters correspond to the Norton equation; ε = Aσn
How will I find the Constant in the Larsen-Miller Parameter, C? in the equation; P = T x (log10t + C) x 10-3
The experimetal data is reprented by plotting temperature on a Log Strain Rate over Log Stress graph. I believe that the Constant is found by the intersect of stress on a Log Strain Rate over 1/T graph?
Any help would be greatly appreciated.
