碳纤维单丝偏轴拉伸力阻效应实验与理论分析

Analysis on electro-mechanical response of carbon fiber under off-axis tension

碳纤维在复合材料基体中的分布较大程度地影响了碳纤维智能材料的感知特性,故需在微米尺度下研究多角度偏轴拉伸下的碳纤维单丝的力电功能响应。测试了不同角度拉伸环境下碳纤维单丝的电阻变化,并对其电阻的变化情况进行了分析。结果表明碳纤维单丝在外载荷偏轴拉伸作用下电阻变化与拉伸角度间存在非线性关系。外载荷在纤维方向产生的应变对电阻变化率的作用强于垂直纤维方向应变对电阻变化率的作用,62°拉伸角为正负力阻效应的临界角度。

Carbon fibers（CF） alignments in the composites matrix have a considerable effect on the self-sensing characteristic to the CF smart composite.The electro-mechanical response of single carbon fiber under off-axis tension is focused on in this wok in micrometer scale.The resistance of CF was tested under off-axis tension.The experimental result indicates that CF resistance change under different angle＇s off-axis tension varies nonlinearly.Strain parallel to CF orientation increases resistance of CF,more effective than strain perpendicular to CF does.The angle 62° between CF orientation and loading direction is the critical value for positive and negative electro-mechanical response.