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《Fiber Reinforced Plastics/Composites》 2009-06
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WANG Guo-jun,SUN Ying,LI Jia-lu(Tianjin and MOE Key Laboratory of Advanced Composites,Composite MaterialsResearch Institute,Tianjin Polytechnic University,Tianjin 300160,China)  
Ultrasonic echo A-scan method was used to scan carbon/epoxy 3D 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.
【Fund】: 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)
【CateGory Index】: TB332
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