On Interface Property Characterization and Performance of Fiber Reinforced Cementitious Composites
On Interface Property Characterization and Performance of Fiber Reinforced Cementitious Composites
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发表时间：
1999
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通讯作者：
Z. Lin;T. Kanda;V. Li
中科院分区：
文献类型：
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作者：
Z. Lin;T. Kanda;V. Li
众所周知，纤维/基体界面性能对纤维增强水泥复合材料的断裂韧性、拉伸和弯曲强度以及延性等性能有重要影响。通过微观力学模型正确表征界面特性可以为设计高性能和低成本的水泥基材料提供有效的工具。本文建立了一个细观力学模型来表征单纤维拉拔水平下的界面特性。该模型明确考虑了界面断裂韧性、摩擦粘结强度和脱粘后滑移硬化系数。还考虑了纤维斜拉引起的纤维断裂和纤维强度降低。导出了完整的复合材料桥接应力-裂纹张开曲线（σB δ关系）。本模型对各种复合材料性能的影响，包括复合材料的抗拉强度、断裂能和互补能（延性的一种度量），以及PVA纤维增强水泥复合材料的一个例子进行了讨论。
It has been well recognized that fiber/matrix interface properties have significant effects on the performance of a fiber-reinforced cement composite, including its fracture toughness, tensile and flexural strength and ductility. Proper characterization of the interface properties via micromechanics models can lead to effective tools for designing high performance and cost-effective cement-based materials. In this paper, a micromechanics model is developed to characterize the interface properties at single fiber pullout level. In the model, interfacial fracture toughness, frictional bond strength and post-debonding slip-hardening coefficient are explicitly accounted for. Fiber rupture and fiber strength reduction due to inclined fiber pullout are also considered. The complete composite bridging stress versus crack opening curve (σB δ relation) is derived analytically. Implications of the present model on various composite properties, including composite tensile strength, fracture energy and complementary energy (a measure of ductility), are discussed along with an example of PVA fiber reinforced cement composites.