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首页> 外文期刊>International Journal of Solids and Structures >Modeling of fiber-reinforced cement composites: Discrete representation of fiber pullout
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Modeling of fiber-reinforced cement composites: Discrete representation of fiber pullout

机译：纤维增强水泥复合材料的建模：纤维拔出的离散表示

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The discrete modeling of individual fibers in cement-based materials provides several advantages, including the ability to simulate the effects of fiber dispersion on pre- and post-cracking composite performance. Recent efforts in this direction have sought a balance between accurate representation of fiber behavior and computational expense. This paper describes a computationally efficient approach to representing individual fibers, and their composite behavior, within lattice models of cement-based materials. Distinguishing features of this semi-discrete approach include: (1) fibers can be positioned freely in the computational domain, irrespective of the background lattice representing the matrix phase;(2) the pre- and post-cracking actions of the fibers are simulated with little computational expense, since the number of system degrees of freedom is independent of fiber count. Simulated pullouts of single fibers are compared with theory and test results for the cases of perfectly-plastic and slip-hardening behavior of the fiber–matrix interface. To achieve objective results with respect to discretization of the matrix, pullout forces are distributed along the embedded lengths of fibers that bridge a developing crack. This is in contrast to models that lump the pullout force at the crack surfaces, which can lead to spurious break-off of matrix particles as the discretization of the matrix is refined. With respect to fracture in multi-fiber composites, the proposed model matches theoretical predictions of post-cracking strength and pullout displacement corresponding to the load-free condition. The work presented herein is a significant step toward the modeling of strain-hardening composites that exhibit multiple cracking.
机译：水泥基材料中单个纤维的离散建模具有几个优点，包括能够模拟纤维分散对开裂前后性能的影响。在此方向上的最新努力已在纤维行为的准确表示与计算费用之间寻求平衡。本文介绍了一种在水泥基材料的晶格模型内表示单个纤维及其复合行为的高效计算方法。这种半离散方法的显着特征包括：（1）可以自由地将纤维放置在计算域中，而与表示基质相的背景晶格无关;（2）用由于系统自由度的数量与光纤数量无关，因此计算量很少。将单根纤维的模拟拔出与理论和测试结果进行了比较，以验证纤维-基体界面的完美塑性和滑移硬化行为。为了获得关于基质离散化的客观结果，拉力沿弥合正在发展的裂缝的纤维的嵌入长度分布。这与在裂纹表面集中拉拔力的模型形成对比，当细化基质的离散化时，该模型会导致基质颗粒的假破坏。关于多纤维复合材料中的断裂，所提出的模型与开裂后强度和对应于无负载条件的拉拔位移的理论预测相匹配。本文介绍的工作是朝建模显示多个裂纹的应变硬化复合材料迈出的重要一步。

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