基于FBGs的快速和常规固化环氧树脂基复合材料的固化残余应变研究  

STRAIN HISTORY IN FAST AND CONVENTIONAL CURING EPOXY MATRIX COMPOSITES INVESTIGATED BY FBGs

作　　者：祁一信 鞠苏[1] 江大志[1] QI Yi-xin;JU Su;JIANG Da-zhi(Department of Materials Science and Engineering,National University of Defense Technology, Changsha 410073,China)

机构地区：[1]国防科技大学空天科学学院,长沙410073

出　　处：《玻璃钢／复合材料》2018年第11期21-26,共6页Fiber Reinforced Plastics/Composites

基　　金：国家自然科学基金(U1537101;11202231)

摘　　要：在纤维增强树脂基复合材料的固化过程中,由于纤维与树脂的热膨胀系数不匹配和树脂的固化体积收缩而产生的固化残余应变对组装设计和控制复合材料的性能至关重要。概述了有损和无损检测固化残余应变的方法;采用光纤布拉格光栅分别检测了快速和常规固化环氧树脂基复合材料的固化残余应变,并结合环氧树脂的流变性对其应变历史进行了分析研究。10层碳纤维单向布增强环氧树脂基复合材料的温度和应变历史表明,固化温度在80℃时,快速和常规固化复合材料第5层的固化反应放热峰值温度分别为133. 7℃和106. 3℃,快速和常规固化复合材料第5层的固化残余应变分别为-4074. 7με和-2660. 8με。Cure residual strain,which is generated by curing shrinkage of resin and mismatch of the coefficient of thermal expansion of the resin and the fiber in curing process of fiber reinforced resin matrix composite,is essential to allow better design and control of properties of the resin matrix composite.In this paper,nondestructive and destructive testing of the cure residual strain were introduced.Fiber Bragg grating sensors(FBGs)were located in ten-ply unidirectional carbon-fiber fabrics reinforced fast and conventional curing epoxy matrix composites manufactured by wet lay-up to measure strain history.The result show that the peak temperature due to curing exothermal reaction was 133.7℃in the 5th ply in the fast curing composite when the cure temperature profile was settled at 80℃,while it was 106.3℃in the conventional curing composite.Cure residual strain in the 5th ply in the fast and conventional curing composites were-4074.7μεand-2660.8με,respectively.

关 键 词：快速固化树脂 固化残余应变 光纤布拉格光栅 碳纤维增强环氧基复合材料 

分 类 号：TB332[一般工业技术—材料科学与工程]