Influences of some materials on J-estimation methods for pipes with circumferential surface cracks |
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| Affiliation: | 1. Welding Division, School of Material Science and Engineering, Tianjin University, Tianjin 300072, China;2. School of Science, Tianjin University, Tianjin 300072, China;1. Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal;2. John Deere, One John Deere Place, Moline, IL 61265, United States;3. Laboratory of Materials Science and Engineering, University of Cantabria, 39005 Santander, Cantabria, Spain;4. Dep. Construction and Manufacturing Engineering, University of Oviedo, Campus de Viesques, 33203 Gijón, Spain;5. Department of Industrial and Mechanical Design, Norwegian University of Science and Technology, Norway;6. Dep. of Mechanical Engineering, University of Waterloo, 200 Univ. Avenue West, Waterloo, ON 2L 3G1, Canada;1. Structural Maintenance and Safety Laboratory (MCS), École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland;2. Steel Structures Laboratory (ICOM), École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland;1. Ecole Centrale de Lyon, LTDS, Ecully, France;2. INSA de Lyon, MATEIS, Villeurbanne, France;1. Department of Civil and Environmental Engineering, Faculty of Science and Technology, University of Macau, Macau, SAR, China;2. School of Civil and Environmental Engineering, Ningbo University, Ningbo, China;3. Collaborative Innovation Centre of Coastal Urban Rail Transit, Ningbo University, Ningbo, China;1. Université de Toulouse, Institut de Mathématiques de Toulouse, UMR CNRS 5215, INSA-Toulouse, 135 avenue de Rangueil, F-31077 Toulouse Cedex 04, France;2. Université de Toulouse, Institut Clément Ader, FRE CNRS 3687 INSA/UPS/ISAE/Mines Albi, 3 rue Caroline Aigle, 31400 Toulouse, France;1. Institut Pprime, CNRS, ISAE-ENSMA, Université de Poitiers, Téléport 2, 1 Avenue Clément Ader, 86961 Futuroscope Chasseneuil Cedex, France;2. Safran Tech, Etablissement SAFRAN PARIS-SACLAY, 1 rue Geneviève Aubé, 78772 Magny Les Hameaux Cedex, France;3. CRITT-MATERIAUX/CERMATEX, ZA Beligon, rue Maurice Mallet, 17303 Rochefort Cedex, France |
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| Abstract: | The approximate calculation methods (SC.ENG1 and SC.ENG2) for the J-integral for pipes with circumferential surface cracks are discussed and three-dimensional elastic–plastic finite element models for circumferentially surface-cracked pipe are conducted to evaluate the accuracy of these methods for different pipe materials used in China. The numerical studies verify that the SC.ENG2 method provides more accurate estimates of J than SC.ENG1. Based on three-dimensional elastic–plastic fracture analysis, the distribution of the local J-integral along the front of a circumferential constant-depth internal surface crack is investigated and the influences of different pipe materials with different yield plateaux on J-integral values are discussed. The validity of SC.ENG1 and SC.ENG2 J-integral estimation methods for pipe steel materials with different yield plateaux used in China are examined in detail and the SC.ENG2 method is found to provide reasonable estimates of J for materials with yield plateaux. |
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