Effects of crack depth and specimen size on ductile crack growth of SENT and SENB specimens for fracture mechanics evaluation of pipeline steels |
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| Authors: | J. Xu,Z.L. Zhang,E. Ø stby,B. Nyhus,D.B. Sun |
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| Affiliation: | 1. Department of Structural Engineering, Norwegian University of Science and Technology (NTNU), Richard Birkelands vei 1a, N-7491 Trondheim, Norway;2. SINTEF, Materials and Chemistry, N-7465 Trondheim, Norway;3. School of Materials Science and Engineering, University of Science and Technology Beijing (USTB), 100083 Beijing, China |
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| Abstract: | A strong geometry dependence of ductile crack growth resistance emerges under large scale yielding. The geometry dependence is associated with different levels of crack tip constraint conditions. However, in a recent attempt to identify appropriate fracture mechanics specimens for pipeline steels, an “independent” relationship between the crack growth resistance curves and crack depths for SENT specimens has been observed experimentally. In this paper, we use the complete Gurson model to study the effects of crack depth and specimen size on ductile crack growth behavior. Crack growth resistance curves for plane strain, mode I crack growth under large scale yielding conditions have been computed. SENB and SENT specimens with three different specimen sizes, each specimen size with three different crack depths, have been selected. It has been found that crack tip constraint (Q-parameter) has a weak dependence on the crack depth for specimens in the low constraint regime. |
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| Keywords: | Crack tip constraint Ductile fracture Crack growth resistance The complete Gurson model Size effect |
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