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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Bibliographic Details
Published inTransactions of the Japan Society of Mechanical Engineers Series A Vol. 53; no. 495; pp. 2090 - 2096
Main Authors KURIHARA, Ryoichi, UEDA, Shuzo
Format Journal Article
LanguageJapanese
Published The Japan Society of Mechanical Engineers 25.11.1987
Subjects
Circumferential Surface Crack
Compliance
Four-Point Bending
Fracture
Leak Before Break
Light Water Reactor Piping
Tearing Modulus
Unstable Fracture
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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.
ISSN:0387-5008
1884-8338
DOI:10.1299/kikaia.53.2090