Role of Loading Rate on Cracking Behavior in Granite Disks With Laboratory Experiments and Grain-Based Modeling

IF 3.1 2区 材料科学 Q2 ENGINEERING, MECHANICAL
Yingming Yang, Ruide Lei, Qingheng Gu, Chao Hu, Linsen Zhou, Shirong Wei, Xuejia Li
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Abstract

The investigation of the tensile properties of rock materials is essential for understanding the failure mechanism of engineering rock masses. In this study, we conducted a series of Brazilian splitting tests on granite specimens under three different loading rates, concurrently monitored using acoustic emission (AE) and digital image correlation (DIC) techniques. The results show that the mechanical parameters of granite disks are positively correlated with the loading rate. The AE waveforms are found to be associated with the lower frequency band, suggesting that this frequency range primarily dominates the failure mechanism in granite disks. Furthermore, the onset of micro-tensile fractures precedes the development of micro-shear ones. The elevation distribution of the fractured surfaces of the granite disks follows a Gaussian function. The fractal dimension increases progressively with the loading rate, whereas the complexity and irregularity of the fractured surface decrease. Moreover, the cracking mechanism of granite disks at the microscale was revealed using grain-based modeling (GBM). The intergranular tensile cracks predominantly form along the radial direction, and the proportion of intergranular shear cracks is the smallest.

加载速率对花岗岩圆盘开裂行为的影响——基于实验室实验和颗粒模型
岩石材料的抗拉特性研究是了解工程岩体破坏机理的基础。在这项研究中,我们在三种不同加载速率下对花岗岩试样进行了一系列巴西劈裂试验,同时使用声发射(AE)和数字图像相关(DIC)技术进行监测。结果表明:花岗岩圆盘的力学参数与加载速率呈正相关;发现声发射波形与较低频段有关,表明该频率范围主要主导花岗岩圆盘的破坏机制。此外,微拉伸断裂的发生先于微剪切断裂的发展。花岗岩盘状裂隙面的高程分布服从高斯函数。随着加载速率的增加,分形维数逐渐增大,而裂缝表面的复杂性和不规则性逐渐减小。此外,利用基于颗粒的模型(GBM)揭示了花岗岩圆盘在微观尺度上的开裂机理。沿径向主要形成沿晶间拉伸裂纹,沿晶间剪切裂纹所占比例最小。
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来源期刊
CiteScore
6.30
自引率
18.90%
发文量
256
审稿时长
4 months
期刊介绍: Fatigue & Fracture of Engineering Materials & Structures (FFEMS) encompasses the broad topic of structural integrity which is founded on the mechanics of fatigue and fracture, and is concerned with the reliability and effectiveness of various materials and structural components of any scale or geometry. The editors publish original contributions that will stimulate the intellectual innovation that generates elegant, effective and economic engineering designs. The journal is interdisciplinary and includes papers from scientists and engineers in the fields of materials science, mechanics, physics, chemistry, etc.
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