Estimation of the Unstable Fracture of Pipe with a Circumferential Surface Crack
Several criteria are proposed to predict the failure bending moment of a pipe which has a circumferential crack and is subjected to external bending moment in LWR (Light Water Reactor) pressure boundary piping. However, those criteria give an unconservative prediction when the pipe has a short and d...
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Published in | Transactions of the Japan Society of Mechanical Engineers Series A Vol. 53; no. 495; pp. 2090 - 2096 |
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Main Authors | , |
Format | Journal Article |
Language | Japanese |
Published |
The Japan Society of Mechanical Engineers
25.11.1987
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Subjects | |
Online Access | Get full text |
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Summary: | Several criteria are proposed to predict the failure bending moment of a pipe which has a circumferential crack and is subjected to external bending moment in LWR (Light Water Reactor) pressure boundary piping. However, those criteria give an unconservative prediction when the pipe has a short and deep circumferential surface crack. This paper presents a half-empirical criterion on the basis of the test results. This criterion gives a conservative prediction by choosing the optimum parameter, even if the pipe has an arbitrary circumferential surface crack. This paper also presents a method to calculate a tearing modulus, TappL, of the pipe containing the circumferential surface crack just after the ligament failure. Moreover, the compliance of a four-point bending machine is converted to an equivalent pipe length, which is used to calculate the value of TappL. |
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ISSN: | 0387-5008 1884-8338 |
DOI: | 10.1299/kikaia.53.2090 |