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中文摘要：
碳纤维水泥基复合材料能以电信号输出的形式反映自身受力状况和内部的损伤程度。通过单丝拔出的细观力学试验,研究了荷载作用下碳纤维水泥基复合材料电阻率变化的机理,获得了水泥基碳纤维复合材料界面电阻随界面力的变化规律。水泥基单丝试样电阻的变化可归纳为由3个方面的原因引起：一是由于纤维-基体之间界面脱黏导致导电网络的变化;二是由于纤维-基体之间界面结构变化而引起导电网络发生改变;三是碳纤维在拉伸应力的作用下其自身电阻会增大,由这一因素引起的电阻变化所占比例极小。复合材料内部导电网络发生改变,导致其电阻率发生变化,材料具有感知应力、应变的功能特性。在循环载荷的作用下,试样电阻率的变化规律与载荷的变化规律显示出了良好的一致性。
英文摘要：
Carbon fiber reinforced cement-based composites is an intrinsically smart material that can sense deformation,as well as damage.The micro-mechanics experiment was designed to study the electromechanical effects mechanism of carbon fiber reinforced cement-based composites.The variation of electrical resistance on the fiber-matrix interface with the shear stress was revealed by single fiber testing.The changes of resistance on the fiber-matrix interface are attributed to three reasons：the interfacial debonding effect on the conductive network;the deformation of the interfacial structure causes the change of conductive network;the change of fiber dimensional leads to the increase of resistance,which contributes slightly to ΔR/R0 and can be neglected.The changes in conductive network result in the change of resistance.The composites exhibit smart properties that provide the capability of sensing the change of strain and stress.The variation of sample resistance was observed to be in good consistency with the loading during cyclic tension.
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