基于碳纤维复合材料传感原理,推导电阻变化率与应变的关系公式,通过CFRP试件轴向拉伸试验,得到试件的初始电阻和伏安特性曲线,研究了在三个不同的应变阶段,试件电阻变化率随应变的变化关系,并通过线性拟合得到初始阶段CFRP试件的灵敏度.试验结果表明:当应变小于0.8％时,电阻变化率随应变变化较快,表现出良好的线性关系,具有良好的力阻效应;当应变在0.8％～2.4％之间时,电阻变化率随应变的变化速度降低,电阻-应变关系曲线出现波动;当应变大于2.4％时,电阻变化率急剧增长,试件破坏.
In this paper,it aims to study the relationship between the CFRP tendons resistance changing rate and the strain in different strain stages.The relationship formula of the resistance changing rate and the strain has been derived,which is based on the sensing principle of CFRP.Then,the initial resistance and volt-ampere characteristic curves of the samples were obtained from the axial tensile test on three bunches of CFRP tendons,which includes its resistance-strain behavior,the initial resistance and volt-ampere characteristic curves.Through studying the changing rate of resistance of the samples which varies with the strain in three different strain stages,the CFRP tendons sensitivity of the initial stage was obtained by linear fitting.Results show that:when the strain is less than 0.8％,the resistance changing rate changes rapidly with the strain,and shows a good linear relationship;when the strain varies from 0.8％ to 2.4％,the changing speed comes lower;and when the strain is higher than 2.4％,the changing rate of resistance increases sharply,which leads to the specimen destroyed.
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