TENSION SOFTENING OF FIBRE-REINFORCED CEMENTITIOUS COMPOSITES
TENSION SOFTENING OF FIBRE-REINFORCED CEMENTITIOUS COMPOSITES
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纤维增强水泥基复合材料的张力软化
DOI：
10.1016/s0958-9465(97)00027-9
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
B. Karihaloo
中科院分区：
文献类型：
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作者：
D. Lange;B. Karihaloo
通过将桥接、不连续裂纹的断裂力学方法与桥接、贯穿裂纹的统计方法（通过桥接应力的一致关系）相结合，建立了表现出广泛基体裂纹的短纤维增强水泥基复合材料的完全拉伸软化行为。这些关系解释了纤维沿裂纹的粘合和摩擦粘合，并且能够适应纤维含量和峰前裂纹对纤维-粘合剂界面性质的影响。该组合方法适用于基于传统高强度水泥粘结剂和致密均匀的水泥-二氧化硅粘结剂（DSP复合材料）的砂浆，并且计算出的单轴拉伸强度与基于混合物规则的单轴拉伸强度之间获得了良好的一致性。尽管拉伸软化模型需要混合成分以及水化产物（例如界面）和初始峰后裂纹配置的许多几何和机械性能，但它为纤维增强水泥基复合材料（特别是 DSP 砂浆）的微观结构设计提供了强大的工具。
The complete tension softening behaviour of short-fibre-reinforced cementitious composites which exhibit extensive matrix cracking is established by combining a fracture mechanical approach for bridged, discontinuous cracks with a statistical approach for a bridged, through-crack via consistent relationships for the bridging stress. These relationships account for adhesive and frictional bonding of fibres along a crack and are capable of accommodating the effects of fibre content and pre-peak cracking upon the fibre-binder interfacial properties. The combined approach is adapted to mortars based on a conventional high-strength cement binder and a dense, homogeneous cement-silica binder (DSP composite), and good agreement is obtained between the uniaxial tensile strength so calculated and that based on the rule of mixtures. Although the tension softening model needs many geometrical and mechanical properties of the mix constituents, as well as of the hydration products (e.g. interfaces) and the initial post-peak crack configuration, it provides a powerful tool for microstructural design of fibre-reinforced cementitious composites, particularly DSP mortars.
Y. Murakami：“核原癌基因 c-jun 和 c-fos，作为 DNA 复制的调节因子。”
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