Shared Excitation Based Nonlinear Ultrasound and Vibrothermography Testing for CFRP Barely Visible Impact Damage Inspection

摘要: Barely visible impact damage (BVID) is inevitable during either fabrication or lifetime of a carbon fiber reinforced plastic (CFRP) component. These flaws are usually difficult to be detected from the surface by visual inspection machine vision based on charge-coupled device CMOS. In order solve problems low efficiency, sensitivity, and small detection area existing nondestructive testing (NDT) for BVID in CFRP, this paper proposes first time integrated nonlinear ultrasound (NU) vibrothermography (VT) NDT shared excitation sources. The experimental system was built after introducing principle NU&VT NDT. CFRP plates with 5, 15, 25 J (VID) as well 12 16 J were tested using NU&VT. Experimental studies signal processing have shown that all VID could NDT, defection capability has significant improvement fast Fourier transform. proposed method provide visualized effective means quality control large-scaled complex shape key components manufacturing process service.