Fracture process zone development and length assessment under the mixed-mode I/II load analysed by digital image correlation technique

IF 10.9 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement and Concrete Research Pub Date : 2023-11-01 DOI:10.1016/j.cemconres.2023.107261

Petr Miarka , Alejandro S. Cruces , Pablo Lopez-Crespo , Wouter De Corte

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引用次数: 1

Abstract

In this paper, the fracture process zone (FPZ) of high-performance concrete (HPC) is investigated under mixed-mode I/II load conditions, and its formation is studied by applying digital image correlation (DIC). The experimental tests are performed on Brazilian disc specimens with central notch (BDCN). The traction-free crack and the FPZ extent ahead of the crack are localised. This is done by modification of the existing methodology for mode I cracks to account for various mixed-mode I/II loading conditions. Analytical and linear elastic fracture mechanics (LEFM) methods for the critical strain are used to find the FPZ extension. Lastly, this paper revisits the analytical formulas used in the prediction of mode I FPZ lengths. These formulas are adjusted to allow for the prediction of the FPZ length in the whole range of mixed-mode I/II load conditions. Experimental results show that the FPZ has a different size for various mixed-mode I/II load conditions.

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采用数字图像相关技术分析了混合模式I/II载荷下断裂过程带发育及长度评价

本文对高性能混凝土(HPC)在I/II混合模式荷载作用下的断裂过程区(FPZ)进行了研究，并应用数字图像相关(DIC)技术对其形成进行了研究。对具有中心缺口(BDCN)的巴西圆盘试件进行了实验试验。对无牵引裂纹和裂纹前的弹性区范围进行了局部化。这是通过修改现有的I型裂缝方法来实现的，以考虑各种混合I/II型加载条件。采用临界应变的解析法和线弹性断裂力学(LEFM)方法求出FPZ扩展。最后，本文回顾了用于I型FPZ长度预测的解析公式。这些公式进行了调整，以允许在混合模式I/II负载条件的整个范围内预测FPZ长度。实验结果表明，FPZ在不同的I/II混合负载条件下具有不同的尺寸。

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

Cement and Concrete Research 工程技术-材料科学：综合

CiteScore

20.90

自引率

12.30%

发文量

318

审稿时长

53 days

期刊介绍： Cement and Concrete Research is dedicated to publishing top-notch research on the materials science and engineering of cement, cement composites, mortars, concrete, and related materials incorporating cement or other mineral binders. The journal prioritizes reporting significant findings in research on the properties and performance of cementitious materials. It also covers novel experimental techniques, the latest analytical and modeling methods, examination and diagnosis of actual cement and concrete structures, and the exploration of potential improvements in materials.