Pressure Vessel Design: The Direct Route

Annex E.7: Examples of Cyclic Fatigue Design Checks

Annex E.7: Examples of Cyclic Fatigue Design Checks

Like in the preceding parts of Annex E, E.4 and E.5, the examples in this part are intended to illustrate the procedure in one specific design check, here the cyclic fatigue design check, and the examples deal, therefore, solely with individual load cases that are related to this F-DC.

The first example is a complement to the comparison of design details in Section E.4.2. The second is a complement to the investigations for the air cooler header considered in Sections E.4.3 and E.5.2.

E.7.1: F-DC of a cylindrical to hemispherical shell transition

This example of an F-DC with hot spots in welded regions deals with the transition of the cylindrical shell to the hemispherical end as given by detail geometry 5 considered in Section E.4.2, and by the comparison of its cyclic fatigue life with that of the transition as given by detail geometry 1, the nominal one. For this example of an F-DC, the structures are assumed to be without a cladding and the model thicknesses (of E.4.2 and E.4.1) are assumed to be fatigue analysis thicknesses.

For the F-DC linear-elastic stress-concentration-free models are used. Therefore, the results obtained with the models used and described in Sections E.4.2 and E.4.1 can be carried over into this F-DC.

Results for diverse stresses at various points due to the maximum permissible pressure P GPD maxof detail geometry 1 are listed in Table E.4.2-1. In the investigations discussed here, a cyclic action NOLC...

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