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Session: Poster pitches day 1
Session starts: Monday 26 June, 09:50
Presentation starts: 09:50

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Kyu Jin Lee (Korea Advanced Institute of Science and Technology (KAIST))
Jung Ryul Lee (Korea Advanced Institute of Science and Technology (KAIST))

Abstract:
Rapid and groundbreaking advancements in 3D printing technology have led to a printing technology using continuous fibers. In the process of continuous fiber 3D printing, inherent defects are inevitable due to the setting of the printing path and the behavior of the continuous fiber itself. Such manufacturing defects can deteriorate structural performance, and methods for visualizing and evaluation are needed. In this study, laser ultrasonic testing (LUT) was mainly used to detect defects that occur when the flight control surface is fabricated by continuous fiber 3D printing. To ensure the precise detection and localization of defects that are key factors for non-destructive testing, a six-degree-of-freedom (DOF) robot arm was used to control the position of the target to be inspected. All of the surfaces of the control surface were inspected based on the scan points calculated through coordinate transformation and spatial rotation using quaternion. Thus a constant stand-off distance was maintained while the sensing laser was vertically incident on the target surface to acquire a high signal-to-noise ratio (SNR) of the ultrasonic signals. From the inspection results, it was verified that the inspection technique we proposed is suitable for the detection of defects in complex-shaped 3D-printed structures.