Dynamic strength and full-field cracking behaviours of pre-cracked rocks under impact loads
文献类型：期刊论文
| 作者 | Liu, Liwang1,3; Li, Haibo2,3 ; Zhang, Guokai1; Fu, Shuaiyang2,3
|
| 刊名 | INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
 |
| 出版日期 | 2024-04-15 |
| 卷号 | 268页码:18 |
| 关键词 | Pre -cracked rocks Impact loads Digital image correlation Dynamic strength Strain localization |
| ISSN号 | 0020-7403 |
| DOI | 10.1016/j.ijmecsci.2024.109049 |
| 英文摘要 | The impact loads have a significant influence on the dynamic strength and cracking behaviours of pre-cracked rocks, which plays a key role in the stability and safety of rock engineering. In this study, impact tests were performed by using a split Hopkinson pressure bar (SHPB) in conjunction with the high-speed photography technique. The dynamic strength of pre-cracked rocks under different strain rates and flaw angles was analysed, and the full-field cracking behaviours were elucidated by the evolution of strain localization zones based on the digital image correlation (DIC) analysis. By means of discrete element method (DEM), the impact tests were numerically reproduced to study the strength enhancement and the cracking processes. The results illustrate that the increase in the strain rate and flaw angle would lead to the increasing dynamic strength, the change of tensile and shear crack number is consistent with the strength variation, implying that the microcracking processes has a significant influence on the rate dependency of dynamic strength. As for the cracking behaviours, the strain localization zones would form around the flaw, and the crack branching phenomenon could be witnessed in dynamic tests. Furthermore, the complexity of cracking patterns becomes larger with the increasing strain rate, while the samples with the large flaw angle are difficult to generate strain localization zones and macroscopic cracks. By using a DIC-based method to analyse the crack initiation mechanisms, three types of stress-induced cracks were identified, i.e., mode I, II, and mixed mode I/II cracks. Among these cracks, the mode II cracks are the dominate type of cracks. Based on the mathematical analysis of Griffith model, the combined action of the tangential stress distribution and sliding deformation might be the reason for the crack initiation, and the ratedependent strength might be induced by the increase of the maximum tangential stress regarding external stress. |
| 资助项目 | National Natural Science Foundation of China[U22A20239] ; National Natural Science Foundation of China[52278504] ; Natural Science Foundation of Jiangsu Province[BK20220141] ; China Postdoctoral Science Foundation[2020M681610] ; Fundamental Research Funds for the Central Universities[309231C8805] |
| WOS研究方向 | Engineering ; Mechanics |
| 语种 | 英语 |
| WOS记录号 | WOS:001169151800001 |
| 出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/40723]  |
| 专题 | 中科院武汉岩土力学所 |
| 通讯作者 | Zhang, Guokai |
| 作者单位 | 1.Nanjing Univ Sci & Technol, Sch Safety Sci & Engn, Nanjing 210094, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liu, Liwang,Li, Haibo,Zhang, Guokai,et al. Dynamic strength and full-field cracking behaviours of pre-cracked rocks under impact loads[J]. INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES,2024,268:18. |
| APA | Liu, Liwang,Li, Haibo,Zhang, Guokai,&Fu, Shuaiyang.(2024).Dynamic strength and full-field cracking behaviours of pre-cracked rocks under impact loads.INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES,268,18. |
| MLA | Liu, Liwang,et al."Dynamic strength and full-field cracking behaviours of pre-cracked rocks under impact loads".INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES 268(2024):18. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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