超声评价碳/环氧三维编织复合材料的实验分析  

EXPERIMENTAL STUDY ON ULTRASONIC EVALUATION OF CARBON/EPOXY 3D BRAIDED COMPOSITES

作　　者：王国军[1] 孙颖[1] 李嘉禄[1] 

机构地区：[1]天津工业大学复合材料研究所,天津市和教育部先进纺织复合材料重点实验室,天津300160

出　　处：《玻璃钢／复合材料》2009年第6期39-42,85,共5页Fiber Reinforced Plastics/Composites

基　　金：天津市高等学校科技发展基金计划项目(20060916);天津市重点基金项目(08JC2DJC25700)

摘　　要：本文采用超声回波法对碳/环氧三维编织复合材料进行超声A-扫描,结合对超声定位的缺陷区域进行细观形貌解剖分析,研究了超声回波波形和三维编织复合材料细观形貌特征的对应关系。在考虑碳纤维单丝分布及纤维束和树脂界面状态的基础上,利用经验的波形分析法讨论了超声波在三维编织复合材料中的衰减。实验研究结果表明,超声回波特征和三维编织复合材料缺陷有对应关系,超声A-扫描波形特征分析可用于碳/环氧三维编织复合材料的无损检测及其缺陷的初步评价。Ultrasonic echo A-scan method was used to scan carbon/epoxy 3 D braided composites. Defects areas located ＇by using ultrasonic scanning were anatomized microscopically to investigate the relationships between the ultrasonic pulse wave characteristics and micro-morphology of defects. Based on the experimental identification method depended on wave analysis method, the ultrasonic attenuation of 3D braided composites was discussed from the point of the distribution of carbon filaments and the interfaces between carbon fiber bundles and resin. The experimental results show that the characteristics of ultrasonic propagation and attenuation in the composites are related to the microstructure and some defects within the 3D braided composites. The characterization of ultrasonic A-scan signal can be used to nondestructive inspection and defects assessment.

关 键 词：三维编织复合材料 超声回波法 缺陷细观形貌 波形分析法 超声衰减 

分 类 号：TB332[一般工业技术—材料科学与工程]