I am in need of a Fatigue Curve for 90/10 CuNi. Anyone have one or know where to obtain one? Any guidance would be appreciated.

I am having fatigue curve for CU/NI, which we used for fire water lines of one of the FPSOs.
Please send me your email id sothat I can send the same to you.

Richard,

The equation we used for fatigue curve for
cuni is

Log10 (N) = c + ( m * Log 10(s))

where N= no of cycles

c = constant = 13.5014

m = constant = -5.0268

S = allowable stress in MPa

K.R.Srinivasan
Pipe stress consultant
Singapore.

Since you didn't give your email addres, I'll post mine here.

richard.havard@mustangeng.com