The most common working condition in the static seal connection system is load fluctuation. The failure mechanism of sealing material caused by load fluctuation is more complicated than that under static load. This work develops an experimental method to research mechanical property of short fiber reinforced rubber matrix sealing composites (SFRC). The damage behavior of creep and stress relaxation after different fatigue cycles is obtained. The microscopic defects are observed and analyzed by scanning electron microscope (SEM). The effects of different fatigue cycles on the damage of materials are found, and the damage modes of SFRC are determined. Based on macroscopic phenomena and microscopic mechanism, the parameters of new creep and stress relaxation models of SFRC after different fatigue cycles are determined, respectively. It can be found that the phenomenological model can well characterize fatigue behavior of SFRC.

静密封连接系统中最常见的工况是载荷波动。载荷波动引起的密封材料失效机理比静载荷下更为复杂。这项工作开发了一种实验方法来研究短纤维增强橡胶基密封复合材料 (SFRC) 的力学性能。得到不同疲劳循环后蠕变和应力松弛的损伤行为。通过扫描电子显微镜（SEM）观察和分析微观缺陷。找出了不同疲劳循环对材料损伤的影响，确定了钢纤维混凝土的损伤模式。基于宏观现象和微观机理，分别确定了不同疲劳循环后SFRC新蠕变和应力松弛模型的参数。