Temperature rise and distribution from Joule heat are important for multifunctional application of carbon fiber reinforced composite. Here we studied the electro-thermal coupling behavior of 3-D braided composite under direct current. The temperature from Joule heat reduced electric resistance and contact resistance in the composite. The reduction range depends on temperature effect on electrical conductivity. We also developed a finite element analysis (FEA) model to show temperature distribution in the composite applied with a current density of 32 kA m⁻². The temperature of two ends of the composite sample decreased to lower values of the center region. The Joule heat generated from the electric resistance of carbon fiber tows contributes to the large amount of temperature rise. The Joule heat generated from the contact resistance leads to non-uniform temperature distribution.

焦耳热的温升和分布对于碳纤维增强复合材料的多功能应用很重要。在这里，我们研究了直流电下 3-D 编织复合材料的电热耦合行为。焦耳热产生的温度降低了复合材料中的电阻和接触电阻。还原范围取决于温度对电导率的影响。我们还开发了一个有限元分析 (FEA) 模型，以显示施加 32 kA m ^-2电流密度的复合材料中的温度分布. 复合样品两端的温度下降到中心区域的较低值。碳纤维丝束的电阻产生的焦耳热导致大量温升。接触电阻产生的焦耳热导致温度分布不均匀。