S_N curve of steel is same for hollow and solid pipe ?

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Claes Richard Fredö

Perhaps this document can give you some guidance.

https://rules.dnvgl.com/docs/pdf/DNV/codes/docs/2011-10/RP-C203.pdf

Hope this helps.

Sincerely

Claes

Theodore Costopoulos

The book of Shigley (or Norton) on machine design is the proper one to guide you in finding the Modifying Factors of the Endurance Limit for the situation of dynamic loading you are trying to solve.