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基于纳米压痕技术对碳纤维/环氧树脂复合材料各组分的原位硬度、弹性模量和蠕变性能进行了测试,实验得到了基体、纤维和微小厚度界面层的力学性能。结果表明,从环氧树脂基体到碳纤维过渡过程中,硬度和弹性模量有明显的梯度变化,并且纤维和树脂基体的原位弹性模量平均值与其非原位性能有一定的变化,实验得到纤维的原位弹性模量有所下降,环氧树脂的弹性模量有所增加。试件制备过程中的机械研磨对其表面产生的残余应力和复合后两种材料的相互影响是组分材料原位性能变化的主要原因。各组分的蠕变性能呈现出明显的差异。
The in-situ hardness, elastic modulus and creep properties of each component of carbon fiber / epoxy composites were tested based on nanoindentation technology. The mechanical properties of matrix, fiber and micro-thickness interfacial layer were obtained. The results show that the hardness and elastic modulus change obviously from epoxy resin matrix to carbon fiber, and the average value of in-situ elastic modulus of fiber and resin matrix changes with its non-in-situ performance. The experimental results show that The in-situ elastic modulus of the fibers decreased, and the elastic modulus of the epoxy resin increased. The main reason for the change of in-situ properties of the component materials is the mechanical grinding’s residual stress on the surface and the interaction between the two materials after the preparation of the test piece. The creep properties of each component show a significant difference.