Abstract Use of steel fiber in high performance cement composite (HPCC) can enhance its strength and toughness, which is achieved through stress transfer from fiber to matrix at interface. In this study, a numerical model in Finite Element Method and three analytical models were proposed to predict bond behaviors between HPCC matrix and three different shaped (straight, hooked, and corrugated) steel fibers at different ages. The proposed numerical model considered an enhancement factor based on the modified interfacial friction law (MIFL). In the analytical models, frictional force following a power function was considered. Predicted results from those numerical and analytical models were compared with existing models and corresponding experimental results. The comparisons indicated that the enhancement factor employed in the MIFL efficiently reflected the change in fiber-matrix bond properties with age. The predicted pullout load-slip relationships and energies from those proposed models showed higher accuracy than those from the existing models.

中文翻译：

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高性能水泥复合材料纤维-基体结合行为的数值模拟和解析建模

摘要 在高性能水泥复合材料（HPCC）中使用钢纤维可以增强其强度和韧性，这是通过界面处纤维到基体的应力传递来实现的。在本研究中，提出了有限元方法中的数值模型和三个分析模型来预测 HPCC 基体与三种不同形状（直形、钩形和波纹形）钢纤维在不同龄期的结合行为。所提出的数值模型考虑了基于改进的界面摩擦定律 (MIFL) 的增强因子。在分析模型中，考虑了服从幂函数的摩擦力。这些数值和分析模型的预测结果与现有模型和相应的实验结果进行了比较。比较表明，MIFL 中采用的增强因子有效地反映了纤维-基质粘合特性随年龄的变化。来自这些提议模型的预测拉拔载荷-滑移关系和能量显示出比现有模型更高的精度。