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레이저 간섭계를 이용한 GFRP평판의 충격속도에 따른 손상평가
김저오 ( Jung Ho Kim ),김대영 ( Dae Young Kim ),장호섭 ( Ho Sub Chang ),신광수 ( Kwang Soo Shin ),김지훈 ( Ji Hoon Kim ) 조선대학교 공학기술연구원 2020 공학기술논문지 Vol.13 No.3
The recent development of techniques in high-tech industries can be categorized into technical advances for safety and convenience and mechanical technology advancements for being ecologically friendly and lightweight. Under such circumstances, GFRP (Glass Fiber Reinforced Plastics), which is one of the representative lightweight materials, has attracted attention. In this study, GFRP flat plate, which is one of the composite materials for light weight, was subjected to free fall and high speed impact through GFRP flat plate to evaluate internal damage by external force such as external impact. The internal damage was evaluated and the following conclusions were obtained. In the damage evaluation according to the impact velocity of the GFRP plate, even if the impact energy collides with the same impact energy, the smaller the mass of the impact body and the faster the speed, the larger the damage amount in the impact. Therefore, it is possible to evaluate the damage of GFRP plate by shearography.
ESPI를 이용한 자외선조사량에 따른 폴리머애자의 탄성계수 변화 연구
김경석,김동수,장호섭,박찬주,장완식,정현철,Kim, Kyeong-Suk,Kim, Dong-Soo,Chang, Ho-Sub,Pack, Chan-Joo,Jang, Wan-Sik,Jung, Hyun-Chul 한국생산제조학회 2010 한국생산제조학회지 Vol.25 No.6
Recently, environment problems have effects on the electronic equipments. Security problems are presented. For security reasons, it is necessary to study electronic equipments. In this paper, we handle the Elasticity modulus on the polymer insulator by UV irradiation. The types of material are used in this experiment, is the EPDM (Ethylene Propylene Diene Monomer). For increasing the reliability, real material specimens are used. For this study, we used ESPI (Electronic speckle pattern interferometry), UTM (Universal thesting machine) device, Accelerated weathering tester. Through this measurement, we evaluated how much UV irradiation has effect on polymer insulator and how long does it take to change the polymer insulator. Also this paper will give a help in electronic industry and the method of measuring the insulator elasticity modulus of polymer could be utilized in life estimation and replacement time of the products of electronic equipment that is used in real industrial fields.
열화상기술을 이용한 모멘트 변화에 따른 피로균열진전 연구
김경석,정현철,박찬주,정덕운,장호섭,Kim, Kyeong-Suk,Jung, Hyun-Chul,Pack, Chan-Joo,Jung, Duk-Woon,Chang, Ho-Sub 한국생산제조학회 2010 한국생산제조학회지 Vol.10 No.6
The objective of this study is to propose an effective method for measurement and analysis of fatigue crack. A technique that can measure the statue of fatigue crack propagation fast and correctly for enhancing safety of constructions and securing reliability is necessary. Moreover, the crack propagation behavior characteristics evaluation technique has to be developed using this technique. In this paper, fatigue crack was caused via the fatigue experiment with repeated load on the CT specimen that is made up of STS304. Fatigue crack propagation was measured by tracing the position of the maximum temperature according to the cycles using infrared thermography. The crack growth characteristics was evaluated by applying the moment values on the measuring area to the measured value. As a result of this study, the possibility that the infrared thermography could be applied to measure the fatigue crack was identified. Moreover, it was identified that fatigue crack propagation have a relationship with the moment value of construction.
ESPI를 이용한 충격손상을 받은 복합재료 내부결함의 정량평가
김경석,양광영,장호섭,지창준,윤홍석 한국공작기계학회 2003 한국공작기계학회 추계학술대회논문집 Vol.2003 No.-
Electronic Speckle Pattern Interferometry for quantitative evaluation of a impact defect inside of composite material plate are described. The impact on composite material makes inside delamination which is difficult to detect visual inspection and ultrasonic testing due to non-homeogenous structure. This paper proposes the quantitative evaluation technique of defects under real impact. Artificial defects are designed inside of composite plate for development of inspection technique and real defects under impact are inspected and compared with results of visual inspection.