S-N fatigue curve deformed pipeline
S-N fatigue curve deformed pipeline
(OP)
Hi.
Deformational processes, like a dent (15% deep), in a pipeline (API 5LX65) changes the S-N fatigue curve of the deformed material?
Thanks
Deformational processes, like a dent (15% deep), in a pipeline (API 5LX65) changes the S-N fatigue curve of the deformed material?
Thanks





RE: S-N fatigue curve deformed pipeline
If you've got a dent that big then it's time to repair it....
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RE: S-N fatigue curve deformed pipeline
However, the S-N data generally includes allowable-stress level mean stress and work-hardened materials anyway.
The geometry of the dent will add some additional stress concentration.
RE: S-N fatigue curve deformed pipeline
I still think a dent of that size is not something which should be allowed.
I'm out of my depth when it comes to fatigue life calcs, but I do know straining the pipe beyond yield takes a big chunk out of the remaining life.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: S-N fatigue curve deformed pipeline
RE: S-N fatigue curve deformed pipeline
RE: S-N fatigue curve deformed pipeline
RE: S-N fatigue curve deformed pipeline
But the question is: ¿can the S-N curves be used in fatigue life analysis of dents where residual stresses and plastic deformation are present?, i.e. ¿S-N curve for this material before and after the dent, is the same?
Thanks,
Jack
RE: S-N fatigue curve deformed pipeline