Mechanical properties and cracking strength estimation of high-strength engineered cementitious composites considering the fracture process zone

IF 5 2区工程技术 Q1 ENGINEERING, MECHANICAL

Theoretical and Applied Fracture Mechanics Pub Date : 2024-09-05 DOI:10.1016/j.tafmec.2024.104647

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Abstract

In the present study, the effect of flaws on the mechanical properties of high-strength engineered cementitious composites (HS-ECC) was investigated. Compressive tests, tensile tests, and electron microscope scanning microscopic tests were designed to explore the influence mechanism of flaws on mechanical properties. The results show that the compressive failure of HS-ECC was primarily characterized by a high density of vertical micro-cracks, and the specimen maintained exceptional structural integrity. All tested mix ratios demonstrated tensile strain hardening. Notably, the test groups with an 18 mm fiber length exhibited superior crack width control, with an average crack width of less than 30 μm. A new fiber bridging model was proposed, informed by microstructural analysis and crack opening displacement observations. A theoretical formula for the cracking strength of HS-ECC was developed based on the fracture process zone concept. The calculated initial crack strength closely matches the experimental values, with a discrepancy range of [0, 17 %]. This close agreement provides robust validation for the accuracy and reliability of the enhanced cracking strength calculation theory, thereby supporting its application in the design of ECC.

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考虑断裂过程区的高强度工程水泥基复合材料的力学性能和开裂强度评估

本研究探讨了缺陷对高强度工程水泥基复合材料（HS-ECC）力学性能的影响。研究设计了压缩试验、拉伸试验和电子显微镜扫描测试，以探讨缺陷对力学性能的影响机理。结果表明，HS-ECC 的抗压破坏主要表现为高密度的垂直微裂纹，试样保持了优异的结构完整性。所有测试的混合比都表现出拉伸应变硬化。值得注意的是，纤维长度为 18 毫米的测试组表现出优异的裂纹宽度控制能力，平均裂纹宽度小于 30 μm。根据微观结构分析和裂纹开口位移观测结果，提出了一种新的纤维桥接模型。根据断裂过程区概念，制定了 HS-ECC 的开裂强度理论公式。计算得出的初始开裂强度与实验值非常吻合，差异范围为 [0, 17 %]。这种密切的一致性有力地验证了增强开裂强度计算理论的准确性和可靠性，从而支持了其在 ECC 设计中的应用。

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.

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