The interfacial damage behavior of short fiber reinforced rubber sealing composites (SRRC) under fatigue load is researched in this article, where an experimental and cohesive zone model approach are employed. The fiber mass fractions of samples are 2%, 5%, and 10%, respectively. The curves of the fatigue strain (ε _n) varying with the fatigue cycle number (n) were obtained by the fatigue test. The damage patterns of SRRC with different fiber mass fractions were confirmed by scanning electron microscope. A finite element model (FEM) was established to predict interfacial fatigue damage, where the cohesive element was imbedded in the interface between fiber and matrix. The results show that the ε _n‐n curves of SRRC predicted by FEM agree well with experimental data when fiber mass fractions are high. The samples with 5% fiber mass fraction are optimal to restrain the origination of the interfacial abhesion, and a possible damage path of SRRC is obtained.

中文翻译：

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纤维增强橡胶的界面疲劳损伤行为—实验和内聚区模型的组合方法

本文研究了短纤维增强橡胶密封复合材料（SRRC）在疲劳载荷下的界面损伤行为，并采用了实验和内聚区模型方法。样品的纤维质量分数分别为2％，5％和10％。疲劳应变（的曲线ε _Ñ）与疲劳循环数变化（Ñ）由疲劳试验而获得。通过扫描电子显微镜确定了不同纤维质量分数的SRRC的损伤模式。建立了有限元模型（FEM）来预测界面疲劳损伤，其中粘结性元素嵌入纤维和基体之间的界面。结果表明，ε _ñ - ñ 纤维质量分数较高时，有限元预测的SRRC曲线与实验数据吻合良好。纤维质量分数为5％的样品最适合抑制界面附着力的产生，并获得了SRRC的可能破坏途径。