복합재료 직교적층판의 비파괴 평가에 관한 연구 = A Study on the nondestructive evaluation of crossply composite laminates

다국어 초록 (Multilingual Abstract)

A new ultrasonic test method is proposed to obtain elastic constants of unidirectional composite materials nondestructively. This work exhibits how susceptive the shear ultrasonic waves are to a little misoriented plies according to the angle variation of shear ultrasonic waves 0°, 45° and 90°.
Also, it is shown that shear waves, particularly the transmission mode with the transmitter and receiver perpendicular to each other, have high sensitivity for detecting anomalies in fiber orientation and ply layup sequence that may occur in the manufacturing of composite laminates. Experimental results are agreed with modeling solutions which were based on decomposition of shear wave polarization vector as it propagates through the composite laminates. This wave appeared considerably to be sensitive to CFRP composites to the thickness direction along in-plane fibers.