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Experimental study on failure estimation method for circumferentially cracked pipes subjected to multi-axial loads

Li, Y. ; Hasegawa, Kunio; Miura, Naoki*; Hoshino, Katsuaki*

The failure estimation method in ASME Code Section XI accounts for the bending moment and axial force due to pressure into account. The torsion moment is not considered. Recently, analytical investigations have been carried out by several authors on the limit load of cracked pipes considering multi-axial loads including torsion and two failure estimation methods for multi-axial loads including torsion moment with different ranges of values have been proposed. In this study, to investigate the failure behavior of cracked pipes subjected to multi-axial loads including the torsion moment and to provide experimental support for the failure estimation methods, failure experiments were performed on 20 mm diameter pipes with a circumferential surface crack or a through-wall crack under combined axial force and bending and torsion moments. Based on the experimental results, the proposed failure estimation methods were confirmed to be applicable to cracked pipes subjected to multi-axial loads.

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