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http://dx.doi.org/10.3795/KSME-A.2007.31.6.710

Elastic-Plastic Fracture Mechanics Analyses for Circumferential Part-Through Surface Cracks at the Interface Between Elbows and Pipes  

Song, Tae-Kwang (고려대학교 기계공학과)
Oh, Chang-Kyun (한국전력기술㈜)
Kim, Jong-Sung (한국전력기술㈜)
Jin, Tae-Eun (한국전력기술㈜)
Kim, Yun-Jae (고려대학교 기계공학과)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.31, no.6, 2007 , pp. 710-717 More about this Journal
Abstract
This paper presents plastic limit loads and approximate J-integral estimates for circumferential part-through surface crack at the interface between elbows and pipes. Based on finite element limit analyses using elastic-perfectly plastic materials, plastic limit moments under in-plane bending are obtained and it is found that they are similar those for circumferential part-through surface cracks in the center of elbow. Based on present FE results, closed-form limit load solutions are proposed. Welds are not explicitly considered and all materials are assumed to be homogeneous. And the method to estimate the elastic-plastic J-integral for circumferential part-through surface cracks at the interface between elbows and straight pipes is proposed based on the reference stress approach, which was compared with corresponding solutions fur straight pipes.
Keywords
Finite Element Analysis; J-Integral; Pipe Bend; Plastic Limit Load; Reference Stress;
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