钻孔与冲击对碳/环氧复合材料电阻影响的计算模型

Modeling of Electrical Resistance Influence in Carbon/Epoxy Composites Result from Drilling and Impact

分别对碳/环氧复合材料进行钻孔和冲击,并测量了钻孔或冲击前后复合材料的电阻,分析了材料电阻变化的机理,建立了复合材料电阻变化计算模型。结果表明,钻孔与冲击都会使复合材料中碳纤维之间接触点(电流截面积)及电荷传导路线发生变化,从而引起复合材料电阻变化。由钻孔对复合材料电阻影响的计算模型推导的冲击计算模型,能够极大地简化有关冲击对复合材料的影响的计算。根据本文所建立的计算模型可以计算出钻孔与冲击引起的复合材料电阻变化率,且与实验测量值相吻合。

Electrical resistance of carbon / epoxy composites were measured before and after they were drilled or impacted separately, the mechanism of electrical resistance change in composites were analyzed, the calculating model of resistance influence in composites were established . The results show that electrical resistance of composites was changed after they had been drilled or impacted, it can be ascribed to the change of contact point among carbon fibers （sectional region of electrical current）and charge conducting route in composites. Impact calculating model derivate from drilling model can greatly simplify the calculating of influence from impact on elec- trical resistance in composites. According to the modeling of electrical resistance influence in carbon / epoxy composites resulting from drilling and impact, the fractional change in resistance of composites can be calculated, and they coincided with the experimental results.