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N cycles difened in ASME B31.1

Thread starter energeng
Start date Mar 3, 2011

Status: Not open for further replies.

Mar 3, 2011

energeng

Mechanical

Hello everybody,

I have a question concerning the term "N"--> total number of equivalent reference displacement stress range, that it used to calculate the factor "f" that affect the ecuation 1A Sa=f(1.25Sc+0.25Sh) showed in para 102.3.2 of ASME B31.1
I don´t know exactly how interpretate 1 cycle.
1 cycle is the range from cold temperature to hot temperature or 1 cycle is the range from cold temperature to hot temperature and again comeback to the cold temperature ??
Can anyone to explain what kind of cycle is concerning in "N" term?

Thanks in advance.