升降温循环及电加热状态下CFRP材料的电导率-温度特性

Conductivity Temperature Dependence of CFRP under Thermal Cycle and DC Heating

为了探究碳纤维增强复合材料(CFRP)的电特性与温度的关系,开展了升降温及直流通电实验,测量并分析了两种情况下CFRP的电导率-温度特性。升降温实验结果表明,CFRP沿平行纤维、垂直纤维及厚度方向的电导率在升降温过程中会形成回滞环现象,但由于材料的结构特性,三个方向的电导率变化规律并不相同,并且当材料发生玻璃化转变后,沿三个方向的电导率-温度特性变化很大;直流通电实验结果表明,电流流动会影响CFRP的电导率及沿纤维方向电导率的变化规律。

In order to investigate the relationship between the electrical properties of carbon fiber reinforced polymer（CFRP） and the temperature, the experiment of thermal cycle and direct current（DC）heating was conducted to measure the conductivity temperature dependence of CFRP. The thermal cycle experiment results show that the conductivity of CFRP along the fiber, vertical fiber and thickness direction will form a hysteresis loop during the process of temperature rise and fall. However, due to the structural properties of the material, the conductivities along three directions are not the same. When the material vitrifies, the conductivitytemperature dependence varies greatly along three directions. The DC heating experiment results show that the current flow will affect the conductivity of CFRP and the variation along the fiber direction.