复合材料结构容易受到外来物体冲击,所以提高复合材料的抗冲击能力至关重要.研究了添加表面毡对复合材料层间增韧的影响.通过使用S-4800场发射扫描电镜(FESEM)、光学显微镜以及压剪、三点弯曲以及拉伸试验方式对含有表面毡(WFM)与不合表面毡试样(WF)进行对比测试.通过观察断裂形貌,发现添加表面毡试样断裂发生在表面毡层,短切纤维连接着相邻两层方格布,起着桥联作用.短纤维的桥联作用改变了剪切破坏机理,增大了能量消耗.测试结果表明,添加表面毡后,单位面积剪切破坏吸能能力提高7.3％.添加表面毡能够降低方格布的曲率,增大相邻方格布的相对滑移能力,进而在弯曲、拉伸过程中产生较小的破坏以及较大的变形.
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