In this study, a noncontact nondestructive testing (NDT) method is proposed to detect the fatigue crack and to identify the location of the damage. To achieve this goal, Lamb wave propagation of a plate-like structure is analyzed, which is induced by scanning laser source actuation system. The Lamb wave propagation is visualized and then damage is detected by wavenumber filtering method based on 3D FFT. Steel plates with fatigue cracks are investigated to verify the effectiveness and the robustness of the proposed NDT approach

• 이창길(성균관대학교 건설환경시스템공학과, 박사과정) | Lee, Changgil
• 김현욱(성균관대학교 u-City공학과, 석사과정) | Kim, Hyun U
• 박승희(성균관대학교 사회환경시스템공학과, 조교수, 공학박사) | Park, Seunghee Corresponding Author