Fiber‐reinforced concrete exhibits a heterogeneous microstructure formed by aggregates, fibers and a matrix, where the stress from external forces can lead to cracking and fracture. This paper discusses the development of a computational measure for predicting the fiber's efficacy by means of the energy absorbed within the initiated area of the cracks. The analytical development was verified with experimental data from the literature and the results were justified with numerical simulations in the elastic regime. This development couples the localization of the stress in the crack tip with the random distribution of the cracks, which leads to the spatial strain field. Such percolation‐based quantification of the cracks in the early‐stage particularly is useful for effective utilization of fibers during the cracking progress.

中文翻译：

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基于渗流的新型纤维增强混凝土梁中纤维功效的度量

纤维增强混凝土表现出由聚集体，纤维和基质形成的异质微观结构，外力引起的应力会导致开裂和断裂。本文讨论了一种计算手段的发展，该手段可通过在裂纹的初始区域内吸收的能量来预测纤维的功效。用文献中的实验数据验证了分析方法的发展，并且通过弹性状态下的数值模拟证明了结果的正确性。这种发展将裂纹尖端中的应力局部化与裂纹的随机分布耦合在一起，从而导致空间应变场。这种基于渗流的早期裂纹定量化对于在裂纹发展过程中有效地利用纤维特别有用。