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Constraint effect on the ductile crack growth resistance of circumferentially cracked pipes |
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| Authors: | J. Xu,Z.L. Zhang,E. Ø stby,D.B. Sun |
| Affiliation: | a Department of Structural Engineering, Norwegian University of Science and Technology (NTNU), N-7491 Trondheim, Norway b SINTEF, Materials and Chemistry, N-7465 Trondheim, Norway c School of Materials Science and Engineering, University of Science and Technology Beijing (USTB), 100083 Beijing, China |
| Abstract: | A systematic study has been carried out by using 2D axisymmetric models to understand the ductile fracture behavior of pipes with internal and external circumferential cracks. Crack growth resistance curves have been computed using the complete Gurson model. Pipes with various diameter-to-thickness ratios, internal pressure, crack depths and material properties are analyzed. The results have been compared with those of corresponding SENT and standard SENB specimens. It clearly indicates that the SENT specimen is a good representation of circumferentially flawed pipes and an alternative to the conventional standard SENB specimen for the fracture mechanics testing in engineering critical assessment of pipes. |
| Keywords: | Axisymmetric model Pipes Biaxial loading Ductile crack growth The complete Gurson model Large scale yielding |
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