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위상잠금 열화상기법을 이용한 복합재 튜브 충격 손상 결함 측정
김경석(Kyoung-Suk Kim),전소영(So young Jeon),정현철(Hyun-Chul Jung) 한국비파괴검사학회 2011 한국비파괴검사학회지 Vol.31 No.2
충격에 의한 복합재 튜브의 내부 박리 현상은 항공 우주 및 자동차 산업 등에서 흔히 발생되어져 왔다. 이러한 복합재 구조물의 안전성을 평가하기 위해서는 적외선열화상기법 (IRT)과 같은 복합재 구조물의 내부 결함을 검출할 수 있는 비파괴검사가 필요하다. 적외선 열화상 이미지 패턴 분석에 의해서 내부 결합이 발생한 복합재 튜브의 내·외부 결함 부위를 확 인할 수 있다. 본 연구에서는 적외선열화상기법을 이용하여 충격 하중에 따른 복합재 튜브 표면에서 방출하는 적외선 에너지를 감지하여 열 분배로부터 복합재 튜브의 내부 결함을 검출하는 연구를 수행하였다. The problem of delamination of composite tubes by impact has been acknowledged in aerospace and automobile industry. Non-destructive testing(NDT) methods in composite material structure are important to evaluate reliability of composite structure. There are many kinds of NDT methods which can detect the inside defect of the composite material such as Infrared Thermography(IRT). Infrared thermal imaging of object is different from that of a defect, in heated composite tubes with an internal defect, and then location and size of a defect can be measured by the analysis of thermal imaging pattern. In this study, Lock-in Infrared thermography detect internal defects of Impacted composite tubes by the inspection of infrared lay radiated from the surface of composite tubes.
적외선 열화상을 이용한 인장하중에 따른 원공시험편의 온도변화 해석
김경석(Kyoung-Suk Kim),김민근(Min-Kwen Kim),최만용(Man-Yong Choi),이승석(Seung-Seok Lee),강기수(Ki-Soo Kang) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
The infrared thermography(IRT) is a technique measuring the radiated energy to objects through the detector. IRT is a non-contact, non-destructive, real-time measurement technique that enables to measure surface temperature fields. When operating the mechanical devices, It is necessary to study the mechanical deformations by temperature evolutions. In this paper, the relationship between tensile speed and temperature evolution is investigated. Experimental results show the radiation of thermal energy in elastic and plastic deformation depends on tensile speed. Thermal radiation energy in elastic deformation is neglected which is independent on tensile speed. and thermal radiation energy in plastic deformation is rapidly increased and the maximum of that appear at ultimate strength.
위상잠금 광-적외선 열화상 기술을 이용한 감육결함이 있는 직관시험편의 결함 검출
김경석(Kyoung-Suk Kim),장수옥(Su-Ok Jang),박종현(Jong-Hyun Park),송재근,정현철(Hyun-Chul Jung) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
Piping in the Nuclear Power plants (NPP) are mostly consisted of carbon steel pipe. The wall thinning defect is mainly occurred by the affect of the flow accelerated corrosion (FAC) of fluid which flows in carbon steel pipes. This type of defect becomes the cause of damage or destruction of piping. Therefore, it is very important to measure defect which is existed not only on the welding partbut also on the whole field of pipe. Over the years, Infrared thermography (IRT) has been used as a non destructive testing methods of the various kinds of materials. This technique has many merits and applied to the industrial field but has limitation to the materials. Therefore, this method was combined with lock-in technique. So IRT detection resolution has been progressively improved using lock-in technique. In this paper, the quantitative analysis results of the location and the size of wall thinning defect that is artificially processed inside the carbon steel pipe by using IRT are obtained.