摘要
研究了掺有碳纤维的水泥基复合材料的导电机理和在轴向压力下的压阻特性 .结果表明 :碳纤维水泥基复合材料的导电性有较显著的压力依赖性 .在低应力水平下电阻随压力增加而降低 ,在较高应力水平下则随应力增大而升高 ,呈现所谓的“电阻负压力系数 (NPCR)和正压力系数 (PPCR)”效应 .在循环荷载作用下 ,电阻的变化呈现Kaiser记忆效应 .电阻的压力依赖性 。
The conductive mechanism and piezoresistivity of carbon fiber reinforced cement based composite (CFRC) were studied.The results showed that there exists a remarkable pressure dependence on the conductivity of CFRC,in which the so-called negative pressure coefficient of resistive (NPCR) and positive pressure coefficient of resistive (PPCR) were observed under low and high pressures.Under the cyclic load,the change in electrical resistance of CFRC showed Kaiser effect.The breakdown and rebuild-up process of conductive network under pressure may be responsible for the pressure dependence on resistivity.
出处
《同济大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2002年第4期456-463,共8页
Journal of Tongji University:Natural Science
基金
国家自然科学基金资助项目 (5 990 80 0 7)
上海市重点学科基金资助项目
