Study on post-buckling crack propagation in thin-walled cylinders under dynamic cyclic load
Buckling is a critical failure mode of the Fast Reactor Main Vessel (FRMV) subjected to seismic load. Post-buckling stability of FRMV is a crucial safety issue during excessive earthquakes. Our prior study revealed that global response becomes stable after buckling by phase-inverse mechanism. Howeve...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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The Japan Society of Mechanical Engineers
2024-01-01
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| Series: | Mechanical Engineering Journal |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/mej/11/1/11_23-00491/_pdf/-char/en |
| _version_ | 1797302431477923840 |
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| author | Yiji YE Masakazu ICHIMIYA Naoto KASAHARA Yukio TAKAHASHI |
| author_facet | Yiji YE Masakazu ICHIMIYA Naoto KASAHARA Yukio TAKAHASHI |
| author_sort | Yiji YE |
| collection | DOAJ |
| description | Buckling is a critical failure mode of the Fast Reactor Main Vessel (FRMV) subjected to seismic load. Post-buckling stability of FRMV is a crucial safety issue during excessive earthquakes. Our prior study revealed that global response becomes stable after buckling by phase-inverse mechanism. However, local fatigue cracks can initiate, penetrate and propagate under cyclic load. In the present study, shaking table experiments using cylindrical models are carried out. The post-buckling crack propagation process is experimentally observed and its mechanism is analyzed. It is shown that dominant cracks always propagate in circumference direction along the diagonal of the diamond-shape buckling dimple. Rapid collapse due to unstable crack propagation never occurs. Instead, a stable propagation mode is observed, where crack growth rate declines with crack circumferential angle. This stability is owing to the displacement-controlled characteristic of dynamic load, which results from the increasing frequency ratio due to crack propagation. Furthermore, a simplified evaluation method based on the estimation of J-integral under displacement-controlled condition is applied to predict the crack growth rate. The comparison with experimental data shows a satisfactory agreement. As a complementary study on global stability of FRMV, the present study confirms a local stability mechanism after buckling, contributing to a more comprehensive understanding on the post-buckling behavior of FRMV. |
| first_indexed | 2024-03-07T23:37:46Z |
| format | Article |
| id | doaj.art-b233f6fcd106434490caed28cbfce99d |
| institution | Directory Open Access Journal |
| issn | 2187-9745 |
| language | English |
| last_indexed | 2024-03-07T23:37:46Z |
| publishDate | 2024-01-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Mechanical Engineering Journal |
| spelling | doaj.art-b233f6fcd106434490caed28cbfce99d2024-02-20T05:27:51ZengThe Japan Society of Mechanical EngineersMechanical Engineering Journal2187-97452024-01-0111123-0049123-0049110.1299/mej.23-00491mejStudy on post-buckling crack propagation in thin-walled cylinders under dynamic cyclic loadYiji YE0Masakazu ICHIMIYA1Naoto KASAHARA2Yukio TAKAHASHI3Department of Nuclear Engineering and Management, The University of TokyoDepartment of Nuclear Engineering and Management, The University of TokyoDepartment of Nuclear Engineering and Management, The University of TokyoDepartment of Mechanical Engineering, Tokyo University of ScienceBuckling is a critical failure mode of the Fast Reactor Main Vessel (FRMV) subjected to seismic load. Post-buckling stability of FRMV is a crucial safety issue during excessive earthquakes. Our prior study revealed that global response becomes stable after buckling by phase-inverse mechanism. However, local fatigue cracks can initiate, penetrate and propagate under cyclic load. In the present study, shaking table experiments using cylindrical models are carried out. The post-buckling crack propagation process is experimentally observed and its mechanism is analyzed. It is shown that dominant cracks always propagate in circumference direction along the diagonal of the diamond-shape buckling dimple. Rapid collapse due to unstable crack propagation never occurs. Instead, a stable propagation mode is observed, where crack growth rate declines with crack circumferential angle. This stability is owing to the displacement-controlled characteristic of dynamic load, which results from the increasing frequency ratio due to crack propagation. Furthermore, a simplified evaluation method based on the estimation of J-integral under displacement-controlled condition is applied to predict the crack growth rate. The comparison with experimental data shows a satisfactory agreement. As a complementary study on global stability of FRMV, the present study confirms a local stability mechanism after buckling, contributing to a more comprehensive understanding on the post-buckling behavior of FRMV.https://www.jstage.jst.go.jp/article/mej/11/1/11_23-00491/_pdf/-char/enfatigue crack propagationthin-walled cylinderpost-bucklingfast reactorbeyond design basis events |
| spellingShingle | Yiji YE Masakazu ICHIMIYA Naoto KASAHARA Yukio TAKAHASHI Study on post-buckling crack propagation in thin-walled cylinders under dynamic cyclic load Mechanical Engineering Journal fatigue crack propagation thin-walled cylinder post-buckling fast reactor beyond design basis events |
| title | Study on post-buckling crack propagation in thin-walled cylinders under dynamic cyclic load |
| title_full | Study on post-buckling crack propagation in thin-walled cylinders under dynamic cyclic load |
| title_fullStr | Study on post-buckling crack propagation in thin-walled cylinders under dynamic cyclic load |
| title_full_unstemmed | Study on post-buckling crack propagation in thin-walled cylinders under dynamic cyclic load |
| title_short | Study on post-buckling crack propagation in thin-walled cylinders under dynamic cyclic load |
| title_sort | study on post buckling crack propagation in thin walled cylinders under dynamic cyclic load |
| topic | fatigue crack propagation thin-walled cylinder post-buckling fast reactor beyond design basis events |
| url | https://www.jstage.jst.go.jp/article/mej/11/1/11_23-00491/_pdf/-char/en |
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