A micromechanics-based fatigue dependent fiber-bridging constitutive model
A micromechanics-based fatigue dependent fiber-bridging constitutive model
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DOI：
10.1016/j.cemconres.2016.09.017
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发表时间：
2016-12
影响因子：
11.4
通讯作者：
J. Qiu;E. Yang
中科院分区：
文献类型：
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作者：
J. Qiu;E. Yang
纤维增强水泥基复合材料（FRCC）代表了一大类建筑材料。尽管对FRCC的疲劳性能进行了大量的实验研究，但预测FRCC的疲劳性能仍然很困难。本文提出了一种新的多尺度分析模型，捕捉纤维桥接FRCC本构关系的疲劳依赖性。在细观尺度上，基于对纤维和纤维-基体界面疲劳依赖性的认识，建立了一个新的预测疲劳后单纤维拔出行为的解析模型（P-ucurve）。在宏观尺度上，考虑了疲劳引起的纤维强度降低，引入概率论描述纤维位置和取向的随机性，从而可以预测疲劳相关的纤维桥接本构关系。本文提出的模型是第一个分析模型，能够捕捉疲劳循环以及疲劳载荷水平的影响，在FRCC的纤维桥接恶化。
Fiber-reinforced cementitious composites (FRCC) represent a large group of construction and building materials. While numerous experimental studies have been conducted on fatigue of FRCC, predicting FRCC fatigue performance remains difficult. This paper proposes a novel multi-scale analytical model to capture the fatigue dependency of fiber bridging constitutive law in FRCC. On the micro-scale, a new analytical model to predict the post-fatigue single-fiber pullout behavior (P-ucurve) is established based on the understanding of the fatigue dependency of fiber and fiber-matrix interface. On the macro-scale, the fatigue-induced fiber strength reduction was considered and probabilistics is introduced to describe the randomness of fiber location and orientation so that the fatigue dependent fiber-bridging constitutive law can be predicted. The model proposed in this paper is the first analytical model that is able to capture the effects of fatigue cycle as well as the fatigue loading level on deterioration of fiber bridging in FRCC.