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Creep Analysis of high temperature tube Larson-Miller

Creep Analysis of high temperature tube Larson-Miller

Creep Analysis of high temperature tube Larson-Miller

(OP)
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.

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