Rate dependency mechanism of crystalline rocks induced by impacts: Insights from grain-scale fracturing and micro heterogeneity
文献类型：期刊论文
| 作者 | Li, X. F.5; Li, H. B.4,5; Zhang, G. K.3; Ju, M. H.2; Zhao, Jian1 |
| 刊名 | INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
 |
| 出版日期 | 2021-09-01 |
| 卷号 | 155页码:19 |
| 关键词 | Strain rate dependency Impact Multiscale fracturing Grain-based model Rock heterogeneity |
| ISSN号 | 0734-743X |
| DOI | 10.1016/j.ijimpeng.2021.103855 |
| 英文摘要 | Rocks in nature contain a large number of defects and exhibit strong heterogeneity on grain scale. In this study, a novel three-dimensional multiscale method is proposed to investigate the dynamic behaviors and microfracturing in granitic rocks. In this numerical method, the heterogeneity in mineral components is reproduced by a series of a space filling Voronoi tessellations and particle filling in subgrains as computational nodal points to allow for transgranular fracturing. The rupture strength, temporal deformation fields, and failure patterns are compared with the experimental results to verify the reasonability and accuracy of the proposed method. Then, the underlying mechanism of grain-scale fracturing leading to fractal fracture surfaces, pervasively grain pulverization and deflection/penetration cracking model are discussed. It's shown that the fracture surface roughness is fractal dominated by two competitive mechanisms. The crack initiation time of intergranular tensile crack, transgranular tensile crack and shear cracks is gradually increased. The ratio of the number of tensile cracks exceeds 90% and that value of intergranular crack decreases from 56% to 33% as the strain rate increases. The appearance of multicracks activation and the transition from intergranular fracturing to transgranular fracturing is the underlying mechanism of rate dependency for granitic rocks. |
| 资助项目 | National Key R&D Program of China[2020YFA0711802] ; National Natural Science Foundation of China[41572307] ; China Scholarship Council[201604910678] |
| WOS研究方向 | Engineering ; Mechanics |
| 语种 | 英语 |
| WOS记录号 | WOS:000750696900001 |
| 出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/34418]  |
| 专题 | 中科院武汉岩土力学所 |
| 通讯作者 | Ju, M. H. |
| 作者单位 | 1.Monash Univ, Dept Civil Engn, Clayton, Vic 3800, Australia 2.China Univ Min & Technol, State Key Lab Geomech & Deep Underground Engn, Xuzhou 211116, Jiangsu, Peoples R China 3.Nanjing Univ Sci & Technol, Sch Mech Engn, Nanjing 210094, Peoples R China 4.Univ Chinese Acad Sci, Beijing 10049, Peoples R China 5.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 | Li, X. F.,Li, H. B.,Zhang, G. K.,et al. Rate dependency mechanism of crystalline rocks induced by impacts: Insights from grain-scale fracturing and micro heterogeneity[J]. INTERNATIONAL JOURNAL OF IMPACT ENGINEERING,2021,155:19. |
| APA | Li, X. F.,Li, H. B.,Zhang, G. K.,Ju, M. H.,&Zhao, Jian.(2021).Rate dependency mechanism of crystalline rocks induced by impacts: Insights from grain-scale fracturing and micro heterogeneity.INTERNATIONAL JOURNAL OF IMPACT ENGINEERING,155,19. |
| MLA | Li, X. F.,et al."Rate dependency mechanism of crystalline rocks induced by impacts: Insights from grain-scale fracturing and micro heterogeneity".INTERNATIONAL JOURNAL OF IMPACT ENGINEERING 155(2021):19. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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