The present paper aims at investigating the relationship between fiber length of hybrid fibers and the tensile strength of sealing composite materials. First, three kinds of fibers: cellulose fiber, aramid pulp fiber, and mineral wool fiber were sieved and their weight-average length was measured. Second, a uniform design method of U8 (43) was adopted to prepare sealing composites by the beater-addition process, and the properties of the tensile strength of the composite were examined. In the end, the relation model was concluded and verified using multi-linear regression analyzation and was further analyzed using micro mechanic theory and interfacial bonding mechanism. The results show that the regression equation can be used to estimate the tensile strength of composites with different hybrid fiber lengths. The tensile strength increased corresponding to the increase of the length of the cellulose fiber but decreased with the increase of the length of aramid pulp and mineral wool fiber. Particularly the fiber length of aramid pulp fiber had the most significant effect on tensile properties. The cases were decided by the comprehensive effects of fibers dispersion, interfacial bonding, and micromechanics.

中文翻译：

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混合纤维长度对密封复合材料拉伸强度影响的研究

本文旨在研究混合纤维的纤维长度与密封复合材料的拉伸强度之间的关系。首先，将纤维素纤维、芳纶纸浆纤维和矿棉纤维三种纤维过筛，并测量它们的重均长度。其次，采用U8(43)的统一设计方法，通过加入搅拌器的工艺制备密封复合材料，并考察了复合材料的抗拉强度性能。最后，利用多元线性回归分析对关系模型进行了总结和验证，并利用微观力学理论和界面结合机理进行了进一步分析。结果表明，回归方程可用于估计不同混合纤维长度的复合材料的拉伸强度。拉伸强度随着纤维素纤维长度的增加而增加，但随着芳纶浆粕和矿棉纤维长度的增加而降低。特别是芳纶浆粕纤维的纤维长度对拉伸性能的影响最为显着。案例是由纤维分散、界面结合和微观力学的综合影响决定的。