Study on the mixed fracture characteristics of concrete-rock Brazilian disks with different fracture angles

IF 5 2区工程技术 Q1 ENGINEERING, MECHANICAL

Theoretical and Applied Fracture Mechanics Pub Date : 2024-08-10 DOI:10.1016/j.tafmec.2024.104614

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引用次数: 0

Abstract

The fracture characteristics of cracked straight-through Brazilian discs for concrete-rock composites (CSTBD-CRC) with different fracture inclination angles (Mode I-II) were investigated to evaluate the stability of concrete reinforcement engineering. Acoustic emission (AE) and digital image correlation (DIC) techniques were employed to study crack propagation and fracture modes in CSTBD-CRC Brazil splitting tests, as well as the entropy evolution of AE and DIC. Additionally, 3D scanning technology and fractal theory were utilized to investigate the effect of the fracture mode on the fracture surface morphology. The results indicate that both the fracture energy and peak load of the CSTBD-CRC increase with increasing fracture inclination angle. Moreover, the section fractal dimensions of 0°, 10°, 15° and 25° samples are 2.01879, 2.01528, 2.01186, and 2.01072. Shear fracture mode increases as the dip angle increases and the fracture surface morphology decreases in fractal dimension. Notably, sharp increases in entropy values for both AE and DIC occurred at peak load, suggesting their use as failure criteria for CSTBD-CRC specimens. Furthermore, cracks were found to initiate at the tips of preexisting cracks within the concrete. The displacement in the x direction undergoes the most significant changes on both sides of the crack during crack growth, while the strain in the x direction experiences its greatest variations at the crack location.

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不同断裂角的混凝土-岩石巴西盘混合断裂特性研究

研究了不同断裂倾角（模式 I-II）的混凝土-岩石复合材料（CSTBD-CRC）开裂直通巴西圆盘的断裂特征，以评估混凝土加固工程的稳定性。采用声发射（AE）和数字图像相关（DIC）技术研究了 CSTBD-CRC 巴西劈裂试验中的裂纹扩展和断裂模式，以及 AE 和 DIC 的熵演化。此外，还利用三维扫描技术和分形理论研究了断裂模式对断裂表面形态的影响。结果表明，CSTBD-CRC 的断裂能和峰值载荷均随断裂倾角的增加而增加。此外，0°、10°、15° 和 25° 样品的断面分形尺寸分别为 2.01879、2.01528、2.01186 和 2.01072。随着倾角的增大，剪切断裂模式也随之增加，断裂表面形态的分形维度也随之减小。值得注意的是，AE 和 DIC 的熵值在峰值载荷时急剧增加，这表明它们可用作 CSTBD-CRC 试样的失效标准。此外，研究还发现，裂缝起始于混凝土内部预先存在的裂缝顶端。在裂缝生长过程中，X 方向的位移在裂缝两侧的变化最为显著，而 X 方向的应变在裂缝位置的变化最大。

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.