A New Method to Measure Crack Extension in Nuclear Graphite Based on Digital Image Correlation
Graphite components, used as moderators, reflectors, and core-support structures in a High-Temperature Gas-Cooled Reactor, play an important role in the safety of the reactor. Specifically, they provide channels for the fuel elements, control rods, and coolant flow. Fracture is the main failure mode...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2017-01-01
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| Series: | Science and Technology of Nuclear Installations |
| Online Access: | http://dx.doi.org/10.1155/2017/2416545 |
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| author | Shigang Lai Li Shi Alex Fok Haiyan Li Libin Sun Zhengming Zhang |
| author_facet | Shigang Lai Li Shi Alex Fok Haiyan Li Libin Sun Zhengming Zhang |
| author_sort | Shigang Lai |
| collection | DOAJ |
| description | Graphite components, used as moderators, reflectors, and core-support structures in a High-Temperature Gas-Cooled Reactor, play an important role in the safety of the reactor. Specifically, they provide channels for the fuel elements, control rods, and coolant flow. Fracture is the main failure mode for graphite, and breaching of the above channels by crack extension will seriously threaten the safety of a reactor. In this paper, a new method based on digital image correlation (DIC) is introduced for measuring crack extension in brittle materials. Cross-correlation of the displacements measured by DIC with a step function was employed to identify the advancing crack tip in a graphite beam specimen under three-point bending. The load-crack extension curve, which is required for analyzing the R-curve and tension softening behaviors, was obtained for this material. Furthermore, a sensitivity analysis of the threshold value employed for the cross-correlation parameter in the crack identification process was conducted. Finally, the results were verified using the finite element method. |
| format | Article |
| id | doaj-art-b44b5919223544e7b5a76184d7e9036a |
| institution | Kabale University |
| issn | 1687-6075 1687-6083 |
| language | English |
| publishDate | 2017-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Science and Technology of Nuclear Installations |
| spelling | doaj-art-b44b5919223544e7b5a76184d7e9036a2025-02-03T01:09:49ZengWileyScience and Technology of Nuclear Installations1687-60751687-60832017-01-01201710.1155/2017/24165452416545A New Method to Measure Crack Extension in Nuclear Graphite Based on Digital Image CorrelationShigang Lai0Li Shi1Alex Fok2Haiyan Li3Libin Sun4Zhengming Zhang5Zhejiang Electric Power Design Institute Co., Ltd., China Energy Engineering Group, Zhejiang, ChinaInstitute of Nuclear and New Energy Technology, Collaborative Innovation Center of Advanced Nuclear Energy Technology, Tsinghua University, Beijing, ChinaMinnesota Dental Research Center for Biomaterials and Biomechanics, University of Minnesota, Minneapolis, MN, USAMinnesota Dental Research Center for Biomaterials and Biomechanics, University of Minnesota, Minneapolis, MN, USAInstitute of Nuclear and New Energy Technology, Collaborative Innovation Center of Advanced Nuclear Energy Technology, Tsinghua University, Beijing, ChinaInstitute of Nuclear and New Energy Technology, Collaborative Innovation Center of Advanced Nuclear Energy Technology, Tsinghua University, Beijing, ChinaGraphite components, used as moderators, reflectors, and core-support structures in a High-Temperature Gas-Cooled Reactor, play an important role in the safety of the reactor. Specifically, they provide channels for the fuel elements, control rods, and coolant flow. Fracture is the main failure mode for graphite, and breaching of the above channels by crack extension will seriously threaten the safety of a reactor. In this paper, a new method based on digital image correlation (DIC) is introduced for measuring crack extension in brittle materials. Cross-correlation of the displacements measured by DIC with a step function was employed to identify the advancing crack tip in a graphite beam specimen under three-point bending. The load-crack extension curve, which is required for analyzing the R-curve and tension softening behaviors, was obtained for this material. Furthermore, a sensitivity analysis of the threshold value employed for the cross-correlation parameter in the crack identification process was conducted. Finally, the results were verified using the finite element method.http://dx.doi.org/10.1155/2017/2416545 |
| spellingShingle | Shigang Lai Li Shi Alex Fok Haiyan Li Libin Sun Zhengming Zhang A New Method to Measure Crack Extension in Nuclear Graphite Based on Digital Image Correlation Science and Technology of Nuclear Installations |
| title | A New Method to Measure Crack Extension in Nuclear Graphite Based on Digital Image Correlation |
| title_full | A New Method to Measure Crack Extension in Nuclear Graphite Based on Digital Image Correlation |
| title_fullStr | A New Method to Measure Crack Extension in Nuclear Graphite Based on Digital Image Correlation |
| title_full_unstemmed | A New Method to Measure Crack Extension in Nuclear Graphite Based on Digital Image Correlation |
| title_short | A New Method to Measure Crack Extension in Nuclear Graphite Based on Digital Image Correlation |
| title_sort | new method to measure crack extension in nuclear graphite based on digital image correlation |
| url | http://dx.doi.org/10.1155/2017/2416545 |
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