碳纤维水泥基复合材料压敏性的灵敏度及机理分析  

Study on Sensitivity of Piezoresistivity and Mechanism for Cement-based Composites with Carbon Fiber

作　　者：王玉林[1] 赵晓华[2] 朱德良[1] 杜建华[3] 

机构地区：[1]武夷学院,武夷山354300 [2]汕头大学,汕头515063 [3]石家庄铁路职业技术学院,石家庄050041

出　　处：《硅酸盐通报》2013年第9期1817-1821,共5页Bulletin of the Chinese Ceramic Society

基　　金：福建省自然科学基金资助项目(2012J05096);武夷学院青年基金项目(XQ201018)

摘　　要：采用阶梯循环加卸载方式,对碳纤维水泥基复合材料在不同应力下压敏性的变化进行试验,提出压敏性的灵敏度概念,对比了未经烘干与经烘干后两种情况下压敏性的灵敏度差异,试验结果表明:未经烘干的碳纤维水泥基复合材料呈现正压敏特性,而烘干后的材料呈现负压敏特性,但两者压敏性的灵敏度均随受压应力的增加而减小,并且经烘干后,材料压敏性的灵敏度随受压应力增加而衰减的速度比未经烘干材料的衰减速度慢。应用隧穿效应和电容效应共同作用机理能较好的分析试验现象。Tests of piezoresistivity have been carried out for carbon fiber reinforced cement dried and undried, by step cyclic loading and unloading method. Results show that piezoresistivity is positive when composites untitled, while piezoresistivity is negative when composites dried, however, sensitivity of piezoresistivity reduces with increasing pressure for both composites undried and dried. By contrast, it has been found that the decay rate of sensitivity of pressure sensitivity is slower for composites dried than for undried. The phenomena are discussed by double effects that tunneling effect and capacitance effect.

关 键 词：碳纤维水泥基材料 灵敏度 正 负压敏性 含水量 衰减速度 

分 类 号：TB332[一般工业技术—材料科学与工程]