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Evaluating on the Effects of Circumferential Thinning Angle and Bending Load on the Failure Pressure of Wall-Thinned Elbow through Burst Tests  

Kim, Jin-Weon (Department of Nuclear Engineering, Chosun University)
Na, Yeon-Soo (Department of Nuclear Engineering, Chosun University)
Lee, Sung-Ho (Nuclear Mechanical and Material Group, KEPRI)
Publication Information
Journal of the Korean Society of Safety / v.21, no.6, 2006 , pp. 14-19 More about this Journal
Abstract
This study performed burst tests using real-scale pipe elbow containing simulated local wall-thinning to evaluate the effects of circumferential thinning angle and bending load on the failure pressure of wall-thinned elbow. The tests were carried out under the loading conditions of internal pressure and combined internal pressure and bending loads. Three circumferential thinning angles, ${\theta}/{\Pi}=0.125,\;0.25,\;0.5$, and different thinning locations, intrados and extrados, were considered. The test results showed that the failure pressure of wall-thinned elbow decreased with increasing circumferential thinning angle for both thinning locations. This tendency is different from that observed in the wall-thinned straight pipe. Also, the failure pressure of intrados wall-thinned elbow was higher than that of extrados wall-thinned elbow with the same thinning depth and equivalent thinning length. In addition, the effect of bending moment on the failure pressure was not obvious.
Keywords
burst test; bending load; circumferential thinning angle; elbow; failure pressure; internal wall-thinning;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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