采用准静态纳米压痕技术表征分析了Kevlar-49/环氧树脂和F-12/环氧树脂两种单向复合材料体系界面相的弹性模量和硬度.结果表明,采用沿单向复合材料纵截面制样的方法,可以得到较平整的芳纶纤维/环氧树脂界面形貌,有利于界面相力学性能的表征.芳纶纤维/环氧树脂界面相的弹性模量和硬度值介于芳纶纤维和环氧树脂的弹性模量和硬度值之间.通过比较分析纤维、树脂和界面相的力学性能,可以推断两种芳纶纤维/环氧树脂体系的界面相厚度均不大于1μm.
The elastic modulus and hardness of interphase region for both Kevlar-49/epoxy and F-12/epoxy unidirectional composites were analyzed using quasistatic nanoindentation method.The results show that the height difference of aramid fiber and epoxy resin in longitudinal section of unidirectional composites is low.Therefore,the experimental error induced by indenter shape can be reduced,so that the mechanical properties of interphase region can be analyzed more accurately.The elastic modulus and hardness of interphase region are distinctly different from those of aramid fiber and epoxy resin.Based on the results of mechanical properties for fiber,epoxy and interphase obtained from nanoindentation,it is assumed that the width of property transition region is less than 1 μm.
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