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使用短芳纶纤维增强炭黑/丁苯橡胶(AF-CB/SBR)复合材料,研究AF对复合材料疲劳行为的影响。在应力控制条件下,少量AF的加入使缺口试样的疲劳寿命提高了25.5倍;疲劳使试样的储能模量(G′)降低,AF的加入使疲劳后试样的Payne效应降低,G_0′/G_(100)′值降低10.5%;复数模量随疲劳周期增加而降低,但少量纤维能使复合材料的复数模量保持在较高的水平,30000周疲劳下AF-CB/SBR的复数模量仍为CB/SBR的1.73倍;疲劳后AF-CB/SBR复合材料的100%、300%定伸应力随疲劳变形量的增加呈先增大后降低的趋势,断裂伸长率有所下降。试样疲劳后相对于拉伸变形量,纤维的增强作用产生滞后效应,相对界面滑脱能随疲劳应变幅度的增加而降低;SEM实验结果显示,疲劳后橡胶基体出现一定的剥离,纤维与橡胶界面受到损伤。
The effect of AF on the fatigue behavior of composites was investigated by using short aramid fiber reinforced carbon black / styrene butadiene rubber (AF-CB / SBR) composites. Under the condition of stress control, the addition of a small amount of AF increased the fatigue life of the notched specimens by 25.5 times; the fatigue reduced the storage modulus (G ’) of the specimens, the addition of AF reduced the Payne effect of the specimens after fatigue, The value of G_0 ’/ G_ (100)’ decreased by 10.5%. The complex modulus decreased with the increase of fatigue cycle. However, the small number of fibers kept the complex modulus at a high level. The complex modulus of AF-CB / SBR composites is still 1.73 times that of CB / SBR. The fatigue properties of 100% and 300% modulus of fatigue of the AF-CB / SBR composites increase first and then decrease with the increase of fatigue deformation, Decline. After the fatigue of the specimen, the lag effect was observed on the reinforcing effect of the fiber relative to the amount of tensile deformation, and the relative interfacial slippage decreased with the increase of the fatigue strain amplitude. The SEM results showed that the rubber matrix was peeled off after fatigue, Damaged.