Fatigue Life Assessment

[mechcad8]

I need to review some historic fatigue assessment cyclic loading calculations can anybody suggest where the best place is to start?

Previous calculations were based on a total of 26,000 operating cycles. I need to review this for up to 36,000 operating cycles. It would be nice if I can agree the orginal value using 26,000.

The previous calculation was carried out using a cyclic loading software package that I no longer have access too.

Does anybody have any useful hints of where the best place is to start? I have initally taken a look at the S-N curves availible in PD5500 and then thought where else could I get some friendly advice? I have little previous experience of working with PD5500 or ASME VIII.

 

[davefitz]

try the EU PED design code EN-12952-4:2000 app b. This is also issued as an ISO code.

If you already have stored the operating data , then it can be evaluated using the rainflow cycle counting algorithm described in app B.

This referenced code does not account for creep-fatigue interactions, though.