Abstract
The elastic-plastic fracture of carbon steel piping having various pipe diameters and crack angles was analyzed using the latest CEGB R6 approach (R6 method) and ASME Screening Criteria (SC method). Results obtained are as follows: (1) It is necessary to apply the elastic-plastic fracture criterion instead of the plastic collapse criterion by increasing the pipe diameter and the crack angle, (2) For the standard pipes (from 6B to 26B), the plastic collapse criterion can stand within the crack angle of 24°. (3) The SC method gives a more conservative estimation than the R6 method. (4) A simplified elastic-plastic fracture analysis procedure based on the R6 method is proposed, where the unstable fracture moment can be calculated on the basis of the plastic collapse moment and the tabulated reduction factor.
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