采用动态疲劳试验研究了不同界面粘结状况的GMT-PP复合材料的疲劳行为.结果表明:GMT-PP界面粘结状况对其拉伸疲劳性能有明显的影响,界面粘结的改善有利于抗疲劳性的提高.进而通过扫描电镜的观察发现具有良好界面粘结的GMT-PP在静态拉伸时破坏形式为基体破坏,而动态拉伸疲劳破坏则以界面脱粘为主.由于界面粘结强度越高,界面脱粘过程越慢,因而,材料的抗疲劳性越好.
The fatigue behaviour of continuous-glass-fibre-mat reinforced polypropylene composites (GMT-PPs) with different interfacial adhesion is investigated by dynamic fatigue tests. The results show that the effect of the interfacial adhesion on the fatigue performance of GMT-PPs is obvious and the improved interfacial adhesion results in an improved fatigue performance. Through the observation of SEM, it is found that the failure modes are different in static tension and dynamic tension for GMT-PPs with strong interfaces. The failure mode of the former is the matrix failure, while that of the latter is the interfacial debonding failure, which means that fatigue loading has a more damaging effect on the interfacial adhesion than on the polymeric matrix. The stronger the interfacial adhesion, the more difficult the interfacial debonding, thus GMT-PPs with well interfacial adhesion has the better the fatigue performance.
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