A study of stable crack growth using experimental methods,finite elements and fractography |
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| Affiliation: | 1. University of Illinois at Urbana-Champaign, Mechanical Science and Engineering, Urbana, IL, USA;2. Cornell High-Energy Synchrotron Source, Ithaca, NY, USA;3. Advanced Photon Source, Argonne National Laboratory, Argonne, IL, USA;4. Deutsches Elektronen Synchrotron Photon Science, Hamburg, Germany;1. Korea Atomic Energy Research Institute, 111 Daedeok-daero 989beon-gil, Yuseong-gu, Daejeon 34057, Republic of Korea;2. Dept. of Mechanical System Design Engineering, Seoul National University of Science and Technology, 232 Gongneung-ro, Nowon-gu, Seoul 01811, Republic of Korea;3. School of Mechanical Engineering, Sungkyunkwan University, 2066 Seobu-ro, Jangan-gu, Suwon 16419, Republic of Korea;4. Structural Integrity Associates, 5215 Hellyer Avenue, Suite 210, San Jose, CA 95138, USA;1. State Key Laboratory of Scientific and Engineering Computing, Chinese Academy of Sciences, Beijing 100190, China;2. Department of Mathematics, University of South Carolina, Columbia, SC 29208, USA;3. Beijing Computational Science Research Center, Beijing 100084, China;4. Department of Scientific Computing, Florida State University, Tallahassee, FL 32306, USA |
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| Abstract: | Systematic analysis of the in-plane constraint influence on J-resistance curves is presented. JR curves were also recorded and analyzed beyond the limits of crack extension inside which the stress field can be assumed to be dominated by J-integral. Three steels and four types of specimen: SEN(B), SEN(T), CCT and DENT have been tested. Along with the JR curves the fracture mechanisms have been analyzed with the help of scanning microscopy. The numerical, finite element analysis has been adopted to compute the Q-stresses, as a measure of the in-plane constraint prior to the onset of crack growth. The analysis of the stress field in front of the crack has been performed to check whether the state of stress prior to the crack growth can predetermine the way the crack will grow. It turns out that characteristic features in the JR curves runs can be predicted qualitatively from the Q(a/W) and Q(J) curves. However, there is a good correlation between Q-stress and voids diameters on fractured surfaces. Several patterns in JR curves runs have been observed for tested specimens; e.g. no influence of specimen thickness on JR curves runs was observed for side-grooved specimens. Strong influence of specimen thickness on JR curve shape was observed for non-side-grooved specimens. JR curve run higher for thinner specimens unless they are dominated by plane stress. For bent specimens JR curves run higher for shorter cracks but they run lower for specimens in tension. |
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