J and CTOD estimation procedure for circumferential surface cracks in pipes under bending |
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Authors: | Mario SG Chiodo |
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Affiliation: | Department of Naval Architecture and Ocean Engineering, Av. Prof. Mello Moraes, 2231 (PNV-EPUSP), São Paulo - SP 05508-030, Brazil |
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Abstract: | This work provides an estimation procedure to determine the J-integral and CTOD for pipes with circumferential surface cracks subjected to bending load for a wide range of crack geometries and material (hardening) based upon fully-plastic solutions. A summary of the methodology upon which J and CTOD are derived sets the necessary framework to determine nondimensional functions h1 and h2 applicable to a wide range of crack geometries and material properties characteristic of structural, pressure vessel and pipeline steels. The extensive nonlinear, 3-D numerical analyses provide a definite full set of solutions for J and CTOD which enters directly into fitness-for-service (FFS) analyses and defect assessment procedures of cracked pipes and cylinders subjected to bending load. |
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Keywords: | J-integral CTOD Fully plastic solutions EPRI methodology Circumferential surface crack Pipeline Defect assessments |
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