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첨단 NDE 기법을 이용한 풍력터빈 블레이드의 페인팅 두께 모니터링 평가기법
임광희(Kwang-Hee Im),장계림(Gue-Lin Zhang),김우진(Woo-Jin Kim),정예원(Ye-Won Jeong),조철현(Chul-Hyun Cho),김선규(Sun-Kyu Kim),조영태(Young-Tae Cho),우용득(Yong-Deuck Woo) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
The composite materials are being utilized on the various areas. Here, the paint used for wind blades was experimentally analyzed which data agreed with known data. Using these characterized material properties, the characteristics were successfully demonstrated through NDE behavior propagating through the painting materials to acquire the refractive index. Both ultrasonic and T-ray techniques were used to analyze the thickness of paint on the GFRP (Glass fiber reinforcement plastics) composites. The non-destructive evaluation (NDE) technique has been established for measuring the thickness. Good results have been obtained in tests on the thickness of the standard painted samples.
Terahertz NDE of the Defects in Thick FRP Composite Materials
Kwang-Hee Im(임광희),Chong-Gui Back(백충걸),Ok-Su Jeong(정옥수),Hyun-Gu Kim(김현구),Yong-Deuck Woo(우용득),D. K Hsu 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.5
A refractive mode technique was suggested for solving a refractive coefficient (n), with which refractive index of GFRP composites, balsa and epoxy. A method of wind turbine blade composites having one and two saw-cuts delaminations was utilized and scanned based on the E-field vector. The time of flight in T-ray using evaluating a T-ray time-domain spectroscopy with the wind turbine blade. Also, the difference of E-field influence was compared with that in the GFRP and CFRP composites.
자동차용 볼트의 검사를 위한 시뮬레이션에 기반한 ECT 센서 설계 및 실험적특성
임광희(Kwang-Hee Im),이슬기(Seul-Gi Lee),김학준(Hak-Joon Kim),송성진(Sung-Jin Song),우용득(Yong-Deuck Woo),나승우(Seung-Woo Ra),이형호(Hyung-Ho Lee) 한국생산제조학회 2015 한국생산제조학회지 Vol.24 No.3
Oil filters for vehicular parts are used under high and low temperatures as the engine is cooled, and defects can be generated with repeated changes in the operating environment and with changes in the shape, such as very high internal losses for the bolts. Visually checking for defects inside a bolt is impossible. Nondestructive evaluation methods such as eddy current testing (ECT) are recommended as a more effective way to examine inside a bolt and detect surface defects in a short amount of time. In this study, the fit bobbin coil eddy current probe was applied to checking the bolts. The bolt parameters were calculated by using a COMSOL analysis program to obtain parameters for professional interior design and fault diagnosis.
테라헤르츠파를 이용한 복합재의 투과특성과 비파괴검사 탐상기법
곽영환(Young-Hwan Kwak),김선규(Sun-Kyu Kim),정종안(Jong-An Jung),조영태(Young-Tae Cho),우용득(Yong-Deuck Woo),임광희(Kwang-Hee Im) 한국생산제조학회 2019 한국생산제조학회지 Vol.28 No.2
Recent technology and instrumentation in terahertz waves have provided a reliable field in the electromagnetic spectrum, which is explored for material evaluation and composite testing. Here, we report an investigation of terahertz waves (T-ray) for the nondestructive evaluation of various materials, such as composite materials and lumbers. The T-ray system uses time domain spectroscopy (TDS) and continuous wave. The various materials and composites investigated include non-conducting materials and composites. Terahertz signals in the TDS mode are similar to that of ultrasound; however, unlike ultrasound, a terahertz pulse can detect a smaller crack hidden behind a larger crack without the shadow effect. These exterminations were demonstrated in thick glass fiber reinforced plastics (GFRP) laminates using saw slots and flat bottom holes. Additionally, two prepared lumbers were investigated using the TDS system through image analysis and refractive index measurement. The effectiveness and limitations of T-ray for the NDE of composites are discussed.