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| Content Provider | Springer Nature Link |
|---|---|
| Author | Xu, N. W. Dai, F. Wei, M. D. Xu, Y. Zhao, T. |
| Copyright Year | 2015 |
| Abstract | The cracked chevron notched Brazilian disc (CCNBD) specimen has been suggested by International Society for Rock Mechanics for measuring mode I fracture toughness of rocks. Subsequently, this specimen geometry has been widely extended to conduct mixed mode fracture tests on rocks as well. A straight through crack front during the fracturing process upon the root of the chevron notch is assumed in the testing principle, but has never been thoroughly evaluated before. In this study, for the first time, the progressive rock fracture mechanism of the CCNBD rock specimen under mixed mode loading is numerically simulated. Specimens under representative mixed mode loading angles are modelled; and the assumption of the straight through crack front growth is critically assessed. The results show that not only the notch tip but also the saw-cut chevron notch cracks during the experiments, yielding a prominent twisted front, far from being straight. The crack front never grows up to the root of the notch ligament and the straight through crack front assumption is never satisfied in the realistic rock fracture progress of this chevron notched specimen subjected to mixed mode loads. In contrast, the fracture progress features typical three-dimensional wing cracking towards the loading ends. The numerically observed progressive fracture mechanism reveals that the measuring principle of mixed mode fracture tests employing CCNBD specimens is significantly violated and the measures of both modes I and II fracture toughness are uncertain. |
| Starting Page | 79 |
| Ending Page | 96 |
| Page Count | 18 |
| File Format | |
| ISSN | 07232632 |
| Journal | Rock Mechanics and Rock Engineering |
| Volume Number | 49 |
| Issue Number | 1 |
| e-ISSN | 1434453X |
| Language | English |
| Publisher | Springer Vienna |
| Publisher Date | 2015-03-15 |
| Publisher Place | Vienna |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Progressive fracture CCNBD Mixed mode Wing crack Acoustic emission Geophysics/Geodesy Civil Engineering |
| Content Type | Text |
| Resource Type | Article |
| Subject | Geology Geotechnical Engineering and Engineering Geology Civil and Structural Engineering |
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