碳纤维混凝土复合材料缺陷的红外热像检测

Inspections on Carbon Fiber-reinforced Concrete Compound Materials for Defects with the Method of Infrared Thermograph

利用碳纤维混凝土的良好导电性,首先通过对存在缺陷的复合材料——碳纤维混凝土试件施加较低的电压,使其产生焦耳热效应,在表面产生温差,再利用红外热像方法对其缺陷进行了无损检测,并根据数据进行了理论分析。实验结果表明:对电阻不同、裂纹缺陷深度相同的材料,小电阻材料所得的红外热像明显,温差大于大电阻材料且变化趋势比大电阻的明显;对电阻相同的大电阻材料,裂纹深度对温差有影响,但变化趋势不如电阻对温差的影响明显。实验结果为进一步研究红外检测复合材料缺陷提供了理论与实验依据。

First, add a lower voltage to the sample of carbon fiber-reinforced coacrete（CFRC） to create a Joule effect on this sample, which is a composite with some defects, by making use of this CFRC material＇s good electric conductivity. As the Joule effect caused some temperature differences on the surface of this sample, the second step it to inspect this sample with the method of infrared thermograph, which won＇t cause any damage to the testing sample. Finally, make a theoretical analysis on the tested data. The result shows： when the materials have some flaws of the same depth, we found the difference of temperature of the material with a smaller resistance is bigger compared with that of the material with a bigger resistance; when the materials share the same resistance, we found the depth flaws also have an effect on the difference of temperature on the surfaces. This result provides some theoretical and experimental proofs for further studies on methods of inspecting composite material for defects.