摘要
电阻法在碳纤维复合材料结构健康监测(SHM)中具有巨大应用前景。本文研究了碳纤维三维角联锁机织复合材料经向和纬向试件在弯曲作用下力-电阻响应,探究电阻变化与复合材料结构损伤的相关性。试验结果表明:经向和纬向试件在弯曲作用下电阻变化与试件主要承载纱线损伤情况具有相关性。准静态三点弯曲加载下,试件电阻变化可以反映试件承载能力变化:在最大载荷点之前,试件电阻基本不变;主要承载纱线发生断裂损伤时,电阻增加。弯曲疲劳加载下,试件电阻变化可以反映试件承载能力退化情况:在弯曲疲劳加载前期,三维角联锁机织复合材料呈现负压阻效应;随着循环次数增加,基体裂纹、界面脱粘等不可逆损伤不断累积,电阻缓慢增大;在弯曲疲劳加载后期,主要承载纱线断裂,电阻显著增加;试件最终疲劳失效时,电阻急剧增加。
Electrical resistance method has great prospects in structural health monitoring(SHM) of carbon fiber reinforced composites. The piezoresistive effect of carbon fiber 3D angle-interlock woven composites in the warp direction and weft direction under bending was investigated to find the relationship between the resistance variation and structure damage. The experimental results show that the resistance variation of the warp and weft samples under bending corresponded with the damage of the main load-bearing yarns. The resistance variation of the composite reflected the change in the load-bearing ability of the composite under the quasi-static three-point bending test. The electrical resistance did not change before the maxim load, while that increased after the main load-bearing yarns occurred breakage. The resistance variation of the composite reflected the degradation in the load-bearing ability of the composite under the bending fatigue test. In the early stage of the bending fatigue test,the negative piezoresistive effect of the composites was observed. The electrical resistance increased slowly due to the accumulation of the irreversible damage including matrix cracks and interface debonding, while that increased significantly after the main load-bearing yarns were damaged. The electrical resistance increased dramatically when the samples occurred fatigue failure.
作者
薛有松
薛凌明
孙宝忠
顾伯洪
XUE Yousong;XUE Lingming;SUN Baozhong;GU Bohong(College of Textiles,Donghua University,Shanghai 201620,China)
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2023年第3期1468-1476,共9页
Acta Materiae Compositae Sinica
关键词
三维角联锁复合材料
三点弯
力阻响应
结构健康监测
碳纤维
3D angle-interlock composites
three-point bending
piezoresistive effect
structural health monitoring
carbon fiber
