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나승우,양이영 朝鮮大學校 機械技術硏究所 2001 機械技術硏究 Vol.4 No.1
This paper shows shear wave behavior of CFRP composite laminates as a polar grid form to evaluate vibration pattern of ultrasonic transducers, which gives measured modelling fundamental contents of nondestructive evaluation. Polarized direction can be obtained by using a c-scanner and sensitivity of transducers is founded when using through-transmission method of two transducers. And modelling of vector decomposition is presented based on ply-to-ply method to apply practicable nondestractive evaluation of CFRP laminate lay up. This modelling decomposes the transmisson of a linearly polarized wave into orthogonal components through each ply of a laminate. It is found that a high provable shows between the model and experimental developed in characterizing layup of CFRP composite laminates
초음파 탐촉자의 분극성에 따른 CFRP 복합적층판 평가에 관한 연구
나승우,임광희,양인영 한국산업안전학회 2002 한국안전학회지 Vol.17 No.1
This paper shows error in the polarization direction on ultrasonic transducers how sensitive 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 a modeling solutions which was 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.
나승우,양인영 朝鮮大學校 機械技術硏究所 2000 機械技術硏究 Vol.3 No.2
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.
탄소섬유 복합재료 구조부재 물성 획득 및 원형부재 충격 전산모사
나승우,김대영,신광수,김지훈 조선대학교 공학기술연구원 2022 공학기술논문지 Vol.15 No.2
Carbon Fiber Reinforced Plastics (CFRP) is composed of carbon fiber and resin. Carbon fiber has superior strength and stiffness and is lighter than primary light metals. When CFRP is applied to structural parts, these general mechanical properties depend on the orientation of the carbon fiber. The mechanical properties of CFRP are obtained through material testing, such as applying tension or compression in different fiber directions. In this study, the physical properties of CFRP were acquired to investigate the impact characteristics of structural members to which CFRP with different layer structures was applied through impact tests and simulations, and based on this, an impact simulation was performed on circular structural members. Three failure criteria were applied to investigate the collapse behavior due to impact loading in the finite element model of the simulation. Moreover, the simulation results according to each failure criterion were compared and considered.