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적층각도 변화를 갖는 CFRP 모자형 단면부재의 열습 및 충격손상 평가
양용준,심재기,Yang, Yong-Jun,Sim, Jae-Ki 한국생산제조학회 2010 한국생산제조학회지 Vol.26 No.1
It is important to satisfy the requirements and standards for the protections of passengers in a car accident. There are lots of studies on the crushing energy absorption of a structure member in automobiles. In this paper, we have studied to investigate collapse characteristics and moisture absorption movements of CFRP( carbon fiber reinforced plastics) structure members when CFRP laminates are under the hygrothermal environment. In particular, the absorbed energy, mean collapse load and deformation mode were analyzed for CFRP members which absorbed most of the collision energy. Also, variation of stacking angle is important to increase the energy absorption capability. The purpose of this study is to evaluate the strength reduction and moisture absorption behavior of CFRP hat shaped member. Therefore we have made a impact collapse experiment to research into the difference of absorbed energy and deformation mode between moisture absorbed specimen and non-moisture absorbed. As a result, the effect of moisture absorption and impact loads of approximately 50% reduction in strength are shown.
7FA G/T 코팅층 크랙 평가를 위한 IR카메라 활용
김재열(Jae-Yeal Kim),심재기(Jae-ki Sim),최철준(Choul-Jun Choi),송경석(Kyung-Suk Song) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.9
In this investigation, we evaluated diagnoses of a defect concerning coating of land-base gas turbine using infrared thermography camera. In this camera method has a strong point which is able to save time and costs compared with former method. Because it can be long field acquire temperature distribution by using non-contact method. But it has a week point that method applies thermal load about inspection sample. Presently, Method used widely in detection of crack is ultrasonic inspection. But this method, There is problem in application in place that uneven surface. In order to check cracks on a blade coating of a gas turbine, a part with cracks in a waste blade disposed after having been used in the field was extracted to produce a sample. So we apply the method by a infrared thermography camerato the produced sample, the sample was heated by means of a halogen lamp. In this paper, we want to describe production of land-base turbine sample, a method of applying thermal load at produced sample, infrared thermography camera technique, an analysis technique of thermography, a defect analysis of coating of land-base gas turbine blades.
7FA G/T 코팅층 크랙 평가를 위한 IR카메라 활용
김재열(Jae-Yeal Kim),심재기(Jae-ki Sim),최철준(Choul-Jun Choi),송경석(Kyung-Suk Song) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
In this investigation, we evaluated diagnoses of a defect concerning coating of land-base gas turbine using infrared thermography camera. In this camera method has a strong point which is able to save time and costs compared with former method. Because it can be long field acquire temperature distribution by using non-contact method. But it has a week point that method applies thermal load about inspection sample. Presently, Method used widely in detection of crack is ultrasonic inspection. But this method, There is problem in application in place that uneven surface. In order to check cracks on a blade coating of a gas turbine, a part with cracks in a waste blade disposed after having been used in the field was extracted to produce a sample. So we apply the method by a infrared thermography camerato the produced sample, the sample was heated by means of a halogen lamp. In this paper, we want to describe production of land-base turbine sample, a method of applying thermal load at produced sample, infrared thermography camera technique, an analysis technique of thermography, a defect analysis of coating of land-base gas turbine blades.
열습환경 하에서의 적층각도 변화에 따른 CFRP 모자형 단면부재의 압궤특성
양용준,양인영,심재기,Yang, Yong-Jun,Yang, In-Young,Sim, Jae-Ki 한국생산제조학회 2009 한국생산제조학회지 Vol.25 No.1
It is important to satisfy the requirements and standards for the protections of passengers in a car accident. There are lots of studies on the crushing energy absorption of structure members in automobiles. We have investigated collapse characteristics and moisture absorption movements of CFRP(Carbon Fiber Reinforced Plastics) hat shaped sectional members when CFRP laminates are under the hygrothermal environment. The absorbed energy, mean collapse load and deformation mode were analyzed for side members which absorbed most of the collision energy. Therefore we have made a static collapse experiment to research into the difference of absorbed energy and deformation mode between moisture absorbed specimen and non-moisture absorbed specimen.
Trimethylgallium, Trimethylauminum과 Arsine을 사용하여 UHVCVD방법으로 성장된 AlGaAs의 탄소 및 알미늄의 유입 특성
노정래(Jeong-Rae Ro),심재기(Jae-Ki Sim),하정숙(Jeong-Sook Ha),박성주(Seong-Ju Park),이일항(El-Hang Lee) 한국진공학회(ASCT) 1993 Applied Science and Convergence Technology Vol.2 No.1
새로운 단결정 박막 성장방법으로 최근에 많은 관심을 끌고 있는 초고진공 화학기상증착법 (Ultra-High Vacuum Chemical Vapor Deposition)을 이용하여 AlGaAs 에피탁시 박막을 성장시켰다. AlGaAs 에피탁시층의 성장은 2° 경사진 GaAs(100) 기판을 사용하였다. 반응 기체로는 Trimethylgallium(TMGa), Trimethylaluminum(TMAl)과 arsine을 사용하였고, 성장온도는 580~700℃, 기체 압력은 10^(-5)~10^(-4)Torr를 유지하였다. 특히 본 연구에서는 arsine을 사전에 열분해 하는 통상의 Chemical Beam Epitaxy(CBE) 성장법과는 달리, arsine이 표면에서 분해되는 화학 반응만을 사용하여도 AlGaAs 에피탁시를 성장할 수 있음은 물론 박막내의 탄소 불순물의 농도가 크게 낮아짐을 관찰하였다. 또한 성장 온도의 변화에 따른 AlGaAs 에피탁시층의 Al 함유 과정에 대하여도 고찰하였다. The AlGaAs epitaxial thin films have been grown by Ultra High Vacuum Chemical Vapor Deposition(UHVCVD) technique which draws much attention recently. Semi-insulating GaAs(100) wafers (2° off (100) toward the nearest (110) plane) were used as substrates. The source gases employed in this study were Trimethylgallium(TMGa), Trimethylaluminum(TMAl) and arsine. The growth temperature of 580-700℃ was used and the growth chamber pressure was maintained at 10^(-5)~10^(-4) Torr during growth. In this study, a great reduction of the carbon impurity concentration was observed in the AlGaAs layer grown by unprecracked arsine which were subject to the surface decomposition processes unlike the conventional Chemical Beam Epitaxy(CBE) method which uses only precracked arsine as a source material. The process of Al incorporation in the AlGaAs epitaxial film by varying the growth temperature has also been investigated.