Abstract The effect of CNTs on the mechanical and damping properties of macro-defect-free (MDF) cements was studied, and polyvinyl alcohol (PVA) fibers were also studied as a contrast. It was found that the compressive strength of MDF cements was not significantly affected by the two types of fibers. The CNTs enhanced the flexural strength of MDF, while PVA fibers made negative contribution. The strengthening mechanism of flexural strength of MDF cements by CNTs can be summarized as fiber bridging, crack deflection and fiber slippage. For the damping properties, the proper contents of CNTs and PVA fibers improved the loss factor significantly. The interface transition zone (ITZ) between the PVA fibers and matrix was large, which was favorable for fiber slippage. The damping property of MDF cements with CNTs was mainly due to the slippage between the inner tubes of the CNTs rather than the slippage between the CNTs and matrix.

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碳纳米管对无宏观缺陷水泥力学和阻尼性能的影响

摘要 研究了碳纳米管对无宏观缺陷（MDF）水泥的力学和阻尼性能的影响，并研究了聚乙烯醇（PVA）纤维作为对比。结果表明，这两种纤维对中密度纤维板水泥的抗压强度没有显着影响。碳纳米管增强了中密度纤维板的弯曲强度，而聚乙烯醇纤维则做出了负面贡献。碳纳米管对中密度纤维板水泥抗弯强度的增强机理可以概括为纤维桥接、裂纹偏转和纤维滑移。对于阻尼性能，适当的碳纳米管和聚乙烯醇纤维含量显着提高了损耗因子。PVA纤维与基体之间的界面过渡区（ITZ）较​​大，有利于纤维滑移。