利用自行建立的疲劳试验系统,以单向聚酯/橡胶复合材料和人造丝/橡胶复合材料为研究对象,揭示了在周期载荷作用下橡胶复合材料的疲劳损伤累积特性,给出了疲劳寿命预报方程,研究了频率对橡胶复合材料疲劳寿命的影响以及材料表面温度的变化规律。发现:橡胶复合材料疲劳过程中伴有较高的热生成,这是橡胶复合材料与其他脆性复合材料最大的不同。疲劳过程中,聚酯/橡胶复合材料的表面温度可达100℃,人造丝/橡胶复合材料的表面温度可达40℃。频率对不同橡胶复合材料的疲劳寿命具有不同的影响。对滞后损失较大的聚酯/橡胶复合材料,增加频率其疲劳寿命明显降低;而对于滞后损失较小的人造丝/橡胶复合材料,频率对其疲劳寿命的影响不明显。

By using a special fatigue testing system for cord/rubber composites, the fatigue damage accumulation characteristics of rubber composites under periodic loading were assessed, and the fatigue life prediction equations were given in the case of polyester/rubber composites and rayon/rubber composites. The effect of frequency on the fatigue life of rubber composites and the variation of surface temperature of rubber composites during fatigue process were also examined. The results indicate that high heat is followed with fatigue process of rubber composites. This is the main difference between rubber composites and brittle composites. The surface temperature canbe reached to 100℃ for polyester/rubber composites and 40℃ for rayon/rubber composites during fatigue experiments. The effect of frequency on the fatigue life of different rubber composites is different. The fatigue life of polyester/rubber composites with high viscoelasticity are increased when frequency is increased and the fatigue life of rayon/rubber composites with low viscoelasticity vary little when frequency ischanged.