Ultrasonic Nondestructive Testing Analysis of 3D 5-Directional Braided Composites

Abstract

Defects might be formed within braided composites because of the special production process and would have negative effects on the mechanics performance of 3D braided composites. It is important to test and analyses defects to take preventive measures for preventing their formation. In this paper, defects of 3D braided composites were analyzed and methods of nondestructive testing were introduced. Ultrasonic nondestructive testing is one of the earliest methods of nondestructive testing used to evaluate composites. Ultrasonic nondestructive tests of 3D 5-directional braided composites were carried in this paper and the characteristics values were extracted by wavelet analysis method and defect qualitative analysis was implemented.