| 曾勇,陈文昭,胡荣,卢铎方.不同冲击荷载下的磷矿岩破裂机理研究[J].南华大学学报(自然科学版),2025,(1):35~43, 55.[ZENG Yong,CHEN Wenzhao,HU Rong,LU Duofang.Study on Fracture Mechanism of Phosphate Rock Under Different Impact Loads[J].Journal of University of South China(Science and Technology),2025,(1):35~43, 55.] |
| 不同冲击荷载下的磷矿岩破裂机理研究 |
| Study on Fracture Mechanism of Phosphate Rock Under Different Impact Loads |
| 投稿时间：2024-06-22 |
| DOI： |
| 中文关键词: 冲击荷载 磷矿岩 分离式霍布金森压杆(SHPB) 破裂特性 颗粒流数值模拟 |
| 英文关键词:impact load phosphate rock split-Hobkinson pressure bar (SHPB) fracture characteristics particle flow code (PFC2D) |
| 基金项目:湖南省自然科学基金项目(2023JJ30511);湖南省自然资源科研项目(20230144DZ);湖南省教育厅项目(重点)(18A252) |
|
| 摘要点击次数: 0 |
| 全文下载次数: 1 |
| 中文摘要: |
| 为研究不同冲击荷载(不同应变率)作用下的磷矿岩破裂特性,通过分离式霍布金森压杆(split hopkinson pressure bar,SHPB)试验方法,对宜昌磷矿岩进行不同冲击荷载下的冲击压缩试验,得到磷矿岩在不同冲击荷载条件下的应力-应变曲线,并对磷矿岩的破坏过程机理进行分析。同时,对实验破裂特性进行了细观颗粒流数值仿真模拟。研究结果表明:低应变率加载条件下,试件碎屑主要以沿晶张拉破坏为主;随着加载应变率的增大,穿晶剪切破坏占比增大。高应变率条件下试件破碎程度高、产生多条裂纹,且剪切破坏的比例增大,表现出与低应变率条件完全不同的破坏形式,这是高应变率条件下磷矿岩强度提高的主要机理。 |
| 英文摘要: |
| To study the fracture characteristics of phosphate rocks under different impact loads (different strain rates), the impact compression test of Yichang phosphate rocks under different impact loads was carried out by SHPB (split-Hobkinson pressure bar) technique. The stress-strain curves of phosphate rocks under different impact loads were obtained, and the failure mechanism of phosphate rocks was analyzed. Meanwhile, the numerical simulation of the microscopic granular flow was performed to obtain the experimental fracture characteristics of the rocks. The results suggest that under low strain-rate loading conditions, the specimen was primarily dominated by intergranular tensile failure; as the strain-rate increased, the incidence rate of transgranular shear increased accordingly. Under high strain-rate conditions, the specimens were broken up into even smaller pieces, with multiple cracks and a higher incidence rate of shear failure, which was completely different from the failure mode of phosphate rocks under low strain rate conditions. This is the main mechanism for the strength increase of the phosphate rock under high strain-rate conditions. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| 关闭 |
|
|
|