碳纤维增强树脂基复合材料的电阻-应变特性  

Characteristics of Electric Resistance-strain Relationship of CFRP Laminates

作　　者：苏小萍[1] 晏石林[2] 胡高平[3] 

机构地区：[1]武汉理工大学材料研究与测试中心,武汉430070 [2]武汉理工大学理学院,武汉430070 [3]湖北大学化工厂,武汉430062

出　　处：《武汉理工大学学报》2005年第12期14-17,共4页Journal of Wuhan University of Technology

摘　　要：对单向及正交碳纤维增强树脂基复合材料(CFRP)在静态拉伸及动态拉-拉载荷作用下的电阻-应变特性进行了研究。结果表明:正交及单向CFRP复合材料在静态拉伸载荷作用下,其电阻变化率随着应变增加表现为3个阶段:较为迅速增加的线性阶段、非线性平缓阶段和阶梯状迅速增加阶段,其实质反映了材料内部纤维在不断增加的应力作用下逐步伸长、变形和断裂的过程,因此可以在结构-智能结构中作为传感材料用于结构完整性的自诊断和自监测;在较小应力幅值(24%)的交变载荷作用下,2种材料的电阻变化率都表现出明显的电阻-应变特性和一定的可逆性,单向CFRP复合材料的电阻变化率较正交CFRP复合材料对应变更敏感。The characteristics of electric resistance-strain relationship of unidirectional and crccks-ply CFRP laminates were studied under static and tensile-tensile dynamic loading. The results show that during static tensile loading, for both unidirectional and cross-ply CFRP laminates, the resistance changes upon strain could be divided into three stages： increasing linear stage, stable nonlinear stage and abrupt increasing stage. It essentially implied that the fibers of material can elongate, deform and breakage during loading, therefore these materials could be used for structural integrity self-diagnosis and monitoring of structural integrity. Upon tensile-tensile dynamic loading at a maximum stress of 24 % of the fracture stress, the resistances of the materials displayed favorable characteristics of electric resistance-strain and some reversibility. Unidirectional laminates had better sensitivity than cross-ply laminates.

关 键 词：CFRP复合材料 电阻-应变特性 应变灵敏度 

分 类 号：TQ327.3[化学工程—合成树脂塑料工业]