Ultrasonic Measurement Method for R-Zone Defects of Stiffened Panel Under Wing Skin

The performance of R-zone components of stiffened panel under wing skin has a significant impact on the overall flight performance, safety and reliability of aircraft. Therefore, it is of great significance to use accurate and reliable nondestructive testing technology in the application of aviation industry. In the ultrasonic testing of components such as stiffened panel under wing skin, the placement of probes, the scattering and focusing of ultrasonic beams have become urgent problems to be solved. In this paper, the synthetic aperture dynamic total focus method is used to measure the front defects of L-shaped R-zone components and the back defects of T-shaped R-zone components. Based on COMSOL simulation platform, the defect measurement method of R-zone components is verified. Finally, the experimental systems are established to characterize the defects qualitatively and quantitatively and realize the detection of circular defects with a diameter of 2mm and 1mm×4mm crack defects.