Investigations on the fracture mechanisms of Z-shaped fissured rock-like specimens

IF 5 2区工程技术 Q1 ENGINEERING, MECHANICAL

Theoretical and Applied Fracture Mechanics Pub Date : 2024-11-05 DOI:10.1016/j.tafmec.2024.104748

Xueying Hu , Shibing Huang , Shuyang Yu , Yifei Li , Jinguo Dong

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引用次数: 0

Abstract

Complex shapes of cracks exist in natural rock masses, however, present research has simplified it into straight line-shaped fissures. In view of this, three-dimensional (3D) printing is employed to make Z-shaped fissured specimens with different main fissure angle α and secondary fissure angle β. The compress fracture experiments are conducted, and full-field strain distributions during crack propagations are obtained using Digital Image Correlation (DIC) technology. Traditional Smoothed Particle Hydrodynamics (SPH) method is improved to examine damage process as well as fracture mechanisms in Z-shaped fissured specimens. It can be concluded that: Wing Crack (WC), Main Crack (MC), Outer Crack (OC) and Inner Crack (IC) are observed in the experiment. The secondary fissure angle β guides the initiation of MC, while the main fissure angle α guides the initiation of WC. Stress–strain curve of 3D printing samples with Z-shaped fissures shows similar trends to that of real rock, experiencing four typical parts. Numerical results show high similarities with experimental results. We have also discussed the crack initiation mechanisms in various main fissure angle α and secondary fissure angle β in the end, and concluded the stress distribution characters. The findings of this research will offer some references for correct understanding of the crack evolution processes and fracture mechanics of Z-shaped fissured rock masses.

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Z 型裂隙岩类试样的断裂机制研究

天然岩体中的裂缝形状复杂，但目前的研究将其简化为直线形裂缝。有鉴于此，采用三维（3D）打印技术制作了不同主裂隙角 α 和次裂隙角 β 的 Z 形裂隙试样。进行了压缩断裂实验，并利用数字图像相关（DIC）技术获得了裂纹扩展过程中的全场应变分布。改进了传统的平滑粒子流体力学（SPH）方法，以研究 Z 形裂纹试样的损伤过程和断裂机制。结论如下实验中观察到了翼裂纹 (WC)、主裂纹 (MC)、外裂纹 (OC) 和内裂纹 (IC)。次裂缝角 β 引导 MC 的产生，而主裂缝角 α 则引导 WC 的产生。带有 Z 形裂隙的 3D 打印样品的应力-应变曲线显示出与真实岩石相似的趋势，经历了四个典型部分。数值结果与实验结果高度相似。最后，我们还讨论了不同主裂隙角 α 和次裂隙角 β 下的裂纹引发机制，并总结了应力分布特征。这些研究成果将为正确理解 Z 型裂隙岩体的裂纹演化过程和断裂力学提供一些参考。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Theoretical and Applied Fracture Mechanics 工程技术-工程：机械

CiteScore

8.40

自引率

18.90%

发文量

435

审稿时长

37 days

期刊介绍： Theoretical and Applied Fracture Mechanics'' aims & scopes have been re-designed to cover both the theoretical, applied, and numerical aspects associated with those cracking related phenomena taking place, at a micro-, meso-, and macroscopic level, in materials/components/structures of any kind. The journal aims to cover the cracking/mechanical behaviour of materials/components/structures in those situations involving both time-independent and time-dependent system of external forces/moments (such as, for instance, quasi-static, impulsive, impact, blasting, creep, contact, and fatigue loading). Since, under the above circumstances, the mechanical behaviour of cracked materials/components/structures is also affected by the environmental conditions, the journal would consider also those theoretical/experimental research works investigating the effect of external variables such as, for instance, the effect of corrosive environments as well as of high/low-temperature.