A cohesive fracture-enhanced phase-field approach for modeling the damage behavior of steel fiber-reinforced concrete

IF 4.7 2区 工程技术 Q1 MECHANICS
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引用次数: 0

Abstract

This study introduces a novel computational framework based on the phase-field fracture/damage model (PFM), providing rapid and accurate predictions of the damage behavior of Steel Fiber Reinforced Concrete (SFRC) material. The framework integrates the interfacial cohesive fracture model with the PFM to depict the interaction between the cementitious matrix and fibers, marking the first demonstration that this model adequately captures both local fracture phenomena between fibers and concrete (such as fiber bridging and interfacial debonding) and mesoscopic stress–strain behavior. Additionally, an enhanced geometric approximation is established based on the spatial distribution density function of fibers and particles, allowing for the transformation of the three-dimensions (3-D) fiber-reinforced material structure into an equivalent two-dimensions (2-D) material. This approach enables the reduction of computational time, a significant limitation of the phase-field method, thereby allowing an in-house code to perform various computations with complex material structures such as SFRC. The effectiveness of the approach is demonstrated through four examples involving variations in the microgeometry and material properties of SFRC structures, ranging from the simplest configurations to real experimental material structures. Extensive Monte Carlo simulations of the model are also employed to provide results closer to reality, which are then compared with recent experimental data and numerical models, demonstrating the efficacy of the proposed computational model.
钢纤维增强混凝土损伤行为建模的内聚断裂增强相场方法
本研究介绍了一种基于相场断裂/损伤模型(PFM)的新型计算框架,可快速准确地预测钢纤维增强混凝土(SFRC)材料的损伤行为。该框架将界面粘聚断裂模型与相场断裂/损伤模型整合在一起,以描述水泥基质与纤维之间的相互作用,首次证明该模型能充分捕捉纤维与混凝土之间的局部断裂现象(如纤维桥接和界面脱粘等)以及介观应力应变行为。此外,还根据纤维和颗粒的空间分布密度函数建立了增强的几何近似,从而可以将三维(3-D)纤维增强材料结构转化为等效的二维(2-D)材料。这种方法可以减少相场方法的一个重要限制因素--计算时间,从而使内部代码能够对 SFRC 等复杂材料结构进行各种计算。通过四个涉及 SFRC 结构微观几何和材料属性变化的示例(从最简单的配置到实际实验材料结构),证明了该方法的有效性。此外,还对模型进行了广泛的蒙特卡罗模拟,以提供更接近实际的结果,然后将这些结果与最新的实验数据和数值模型进行比较,从而证明所提出的计算模型的有效性。
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
CiteScore
8.70
自引率
13.00%
发文量
606
审稿时长
74 days
期刊介绍: EFM covers a broad range of topics in fracture mechanics to be of interest and use to both researchers and practitioners. Contributions are welcome which address the fracture behavior of conventional engineering material systems as well as newly emerging material systems. Contributions on developments in the areas of mechanics and materials science strongly related to fracture mechanics are also welcome. Papers on fatigue are welcome if they treat the fatigue process using the methods of fracture mechanics.
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