碳纤维复合材料压敏性微观实验研究

Micro-experimentation research on Compression Sensitivity of Carbon Fiber Concrete

碳纤维水泥基复合材料具有应变-电阻效应。该文通过碳纤维水泥基复合材料单丝拉伸实验与扫描电镜同步观测,探究碳纤维水泥基复合材料载荷作用下电阻变化规律。结果表明:在碳纤维拔出过程中,试件在弹性阶段拉力-位移及电阻变化率-应变保持了线性关系,电阻应变灵敏系数为38.38±0.05。循环加载实验表明试样在弹性变形过程中,电阻变化率随位移变化呈现周期性变化。

The carbon fiber cement has compression sensibility. In this paper, the compression sensitivity of carbon fiber concrete is analyzed by Scanning Electron Microscopy with single fiber pull--out testing. Results show that the resistance of carbon fiber cement increases during the tensile test, the fractional change in resistance per unit strain of The carbon fiber cement is 38.38±0.05. In the meantime, the variation of resistance of single fiber pull--out under cyclic loading was studied. The resistance change caused by the elastic deformation is reversibility.