Rock-like material under large diameter SHPB dynamic splitting tension: meso-damage mechanical behavior and stress wave propagation model

IF 2.6 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
Rongzhou Yang, Ying Xu, Meilu Yu, Jinjin Ge, Qi An, Pengying Ma
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Abstract

The mechanical behavior of splitting tensile damage and the law of stress wave propagation of rock-like materials (RLM) are of great significance to further reveal the dynamic disaster mechanism of the deep rock mass. The meso-damage mechanical behavior and stress wave propagation characteristics of RLM disks under impact splitting were studied by using a large diameter split Hopkinson pressure bar (SHPB). In terms of dynamic damage, the splitting tensile stress-compression strain curves of RLM disks obviously showed three stages of mechanical behavior evolution: initial elastic-plastic deformation, pre-peak plastic damage, and post-peak brittle fracture failure. The macro-damage of RLM disks increased with the increase of strain rate. The meso-tensile fracture was the result of both the initial meso-damage and the impact splitting meso-damage. The dynamic splitting damage variable defined based on the damage fracture energy can accurately describe the damage evolution characteristics of impact splitting on RLM disks. In the aspect of stress wave propagation, the peak value of transmission stress showed an advanced effect with the increase of incident stress wave. In the early stage (0–50 μs), the transmission stress wave ratio (σT/σI) increased with the increase of strain rate, while in the later stage (82–200 μs), the transmission stress wave ratio (σT/σI) decreased with the increase of strain rate. The stress wave propagation law in the process of impact splitting on RLM disks was clearly revealed based on the stress wave propagation model established by the one-dimensional elastic stress wave theory. Finally, the dynamic mechanical mechanism of splitting damage and fracture of RLM disks under different strain rates was discussed deeply.
大直径 SHPB 动态劈裂拉伸作用下的类岩石材料:中损伤力学行为和应力波传播模型
类岩材料(RLM)的劈裂拉伸损伤力学行为和应力波传播规律对进一步揭示深部岩体的动力致灾机理具有重要意义。利用大直径劈裂霍普金森压力棒(SHPB)研究了冲击劈裂作用下 RLM 盘的中观损伤力学行为和应力波传播特征。在动态损伤方面,RLM 盘的劈裂拉伸应力-压缩应变曲线明显呈现出三个阶段的力学行为演变:初始弹塑性变形、前峰塑性损伤和后峰脆性断裂破坏。随着应变速率的增加,RLM 盘的宏观损伤也随之增加。中间拉伸断裂是初始中间损伤和冲击分裂中间损伤的结果。基于损伤断裂能定义的动态劈裂损伤变量能准确描述 RLM 盘冲击劈裂的损伤演化特征。在应力波传播方面,随着入射应力波的增加,透射应力的峰值呈现出提前效应。在早期(0-50 μs),透射应力波比(σT/σI)随应变速率的增加而增大,而在后期(82-200 μs),透射应力波比(σT/σI)随应变速率的增加而减小。根据一维弹性应力波理论建立的应力波传播模型,清晰地揭示了 RLM 盘冲击劈裂过程中的应力波传播规律。最后,深入探讨了不同应变速率下 RLM 盘劈裂损伤和断裂的动态力学机理。
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来源期刊
Frontiers in Materials
Frontiers in Materials Materials Science-Materials Science (miscellaneous)
CiteScore
4.80
自引率
6.20%
发文量
749
审稿时长
12 weeks
期刊介绍: Frontiers in Materials is a high visibility journal publishing rigorously peer-reviewed research across the entire breadth of materials science and engineering. This interdisciplinary open-access journal is at the forefront of disseminating and communicating scientific knowledge and impactful discoveries to researchers across academia and industry, and the public worldwide. Founded upon a research community driven approach, this Journal provides a balanced and comprehensive offering of Specialty Sections, each of which has a dedicated Editorial Board of leading experts in the respective field.
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