Most pipe components receive cyclic stress. Then, the LBB (Leak Before Break) behaviours by cyclic load have recently been attracting much attention from a structural integrity point of view. However, studies of fatigue crack growth behaviours and crack opening displacement on a complex through wall crack in pipe are relatively rare. To that purpose, a series of fatigue tests have been carried out at room temperature on carbon steel pipes which have an outer or inner surface crack. Before crack penetration, by using a plate model considered, leak life, fatigue crack growth behaviours such as aspect ratios and da/dN vs Delta K relation were evaluated successfully. After crack penetration, new formulas to evaluate K were proposed. For complex crack after through wall, fatigue life, crack growth behaviours and crack opening displacement were evaluated successfully by using the new formulas proposed in this paper.
Fatigue crack growth and penetration behaviours in pipes subjected to bending moment
High Pressure Technology, 1998, ASME/JSME Joint Pressure Vessels and Piping Conference, 1998 ; 63-70
ASME/PVP ; 371
1998
8 Seiten, 14 Quellen
Aufsatz (Konferenz)
Englisch
An Approach to Prediction for Naturally Short Fatigue Crack Growth Behaviours
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