周期载荷下聚酯/橡胶复合材料和人造丝/橡胶复合材料的热生成对疲劳行为的影响

以单向帘线增强橡胶复合材料为研究对象,研究了周期载荷作用下橡胶复合材料的热生成对疲劳行为的影响。橡胶复合材料在疲劳过程中伴随较多的热生成,SEM观察表明:热生成温度与断裂表面密切联系。橡胶复合材料的滞后损失并不是全部转换为热,而是其中一部分被内能变化所消耗,不转换为有效热生成的滞后损失与疲劳损伤导致的结构变化有关。在疲劳试验中,直到疲劳破坏所消耗的平均有效能耗与疲劳寿命之间存在定量关系。

EFFECT OF GENERATION HEAT ON FATIGUE BEHAVIOR OF POLYESTER/RUBBER COMPOSITES AND RAYON/RUBBER COMPOSITES UNDER CYCLIC LOADING

By using unidirectional cord reinforced rubber composites, the effect of generation heat on the fatigue behavior of rubber composites under cyclic loading was assessed. A great amount of heat was generated during the fatigue process of rubber composites. SEM photomicrographs show that the fracture surface of rubber composites under cyclic loading is closely interrelated with the generation heat. The energy loss which does not convert to effective heat generation is associated with fatigue damage in relation to the structural change leading to fatigue failure. It is found out that a quantitative relation exists between the average effective energy loss of fatigue damage and the fatigue life of rubber composites.