不同电参数对CFRC应变敏感性的响应

Response of Different Electric Parameter to Strain-sensing Ability of CFRC

CFRC具有压敏性 ,测试方法和测试参数的选择对 CFRC的压敏性有一定的影响。采用直流电阻测试法、交流阻抗测试法和电容测试法研究了不同电参数 (直流电阻、交流阻抗、电容 )对 CFRC应变敏感性的响应。实验结果表明 :直流电阻和交流阻抗随压力的变化都能反映试样受载变形的全过程 :弹性阶段、损伤阶段、破坏阶段 ;电容随压力的增大而增大 ;交流阻抗和电容随应变的变化比直流电阻随应变的变化灵敏且稳定。最后对这 3种测试方法作了综合评价。

The carbon fiber reinforced cement(CFRC) has pressure sensibility. The selection of measuring technique and parameter has an effect on the pressure sensibility of CFRC. In this paper, the response of different electric parameter (dc resistance and ac impedance and capacity )to strain-sensing ability of CFRC has been studied by dc resistance and ac impedance and capacity measuring techniques. The results showed that the change of ac impedance and capacity with stress-strain is more sensitive and stabler than that of dc resistance. Finally, the three measuring technique were reviewed and compared.