http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
언더컷 형상의 판재 성형품에 보강용 CFRP 패치의 접합을 위한 공정기술 개발
이환주,전용준,조훈,김동언,Lee, Hwan-Ju,Jeon, Yong-Jun,Cho, Hoon,Kim, Dong-Earn 한국금형공학회 2020 한국금형공학회지 Vol.14 No.4
Partial reinforcement of sheet metal parts with CFRP patch is a technology that can realize ultra-lightweight body parts while overcoming the high material cost of carbon fiber. Performing these patchworks with highly productive press equipment solves another issue of CFRP: high process costs. The A-pillar is the main body part and has an undercut shape for fastening with other parts such as roof panels and doors. Therefore, it is difficult to bond CFRP patches to the A-pillar with a general press forming tool. In this paper, a flexible system that applies uniform pressure to complex shapes using ceramic particles and silicone rubber is proposed. By benchmarking various A-pillars, a reference model with an undercut shape was designed, and the system was configured to realize a uniform pressure distribution in the model. The ceramic spherical particles failed to realize the uniform distribution of high pressure due to their high hardness and point contact characteristics, which caused damage to the CFRP patch. Compression equipment made of silicone rubber was able to achieve the required pressure level for curing the epoxy. Non-adhesion defects between the metal and the CFRP patch were confirmed in the area where the bending deformation occurred. This defect could be eliminated by optimizing the process conditions suitable for the newly developed flexible system.
이환주,이선민,양정임,한자은,이수경,김민규 한국축산식품학회 2004 심포지움 및 학술발표회 Vol.- No.34
본 연구는 국내산 돈육의 오염도 및 병원균의 분포를 조사하기 위해 실시되었다. 가공전의 원료육과 절단 가공 후의 포장육의 병원균 오염도 비교시, 원료육 38.7% 포장육 32.3%로 원료육의 오염도가 더 높았다. 이는 비위생적인 도축시의 오염으로 추정이 가능하며 현재 의무적으로 실시하는 도축장의 HACCP 관리기준을 더욱 준수하여 위생안전성을 높여야 한다고 판단된다. 병원균에서는 L. monocytogenes의 분리율이 가장 높았으며 초기 오염이 제어되지 않을시, 저온성장균이라는 특징을 가진 증식은 L. monocytogenes 보관온도 준수만으로는 억제할 수 없다고 사료된다. 또한 축산물 취급 장소별로도 상이한 결과를 보였으며, 가장 낮은 오염 수치인 8.3%와 가장 높은 81.8%의 차이로 보아, 원료 축산물과 관련하여 취급 장소의 위생상태가 축산물의 안전성에 많은 영향을 끼친다고 사료된다.
22MnB5 / 탄소섬유 강화 플라스틱으로 제작된 단면 보강 하이브리드 적층판의 강도 보강에 관한 연구
이환주,전용준,김동언,Lee, Hwan-Ju,Jeon, Young-Jun,Kim, Dong-Earn 한국금형공학회 2022 한국금형공학회지 Vol.16 No.2
As environmental regulations are strengthened, automobile manufacturers continuously research lightweight structures based on carbon fiber reinforced plastic (CFRP). However, it is difficult to see the effect of strength reinforcement when using a single CFRP material. To improve this, a hybrid laminate in which CFRP is mixed with the existing body structural steel was proposed. In this paper, CFRP patch reinforcement is applied to each compression/tensile action surface of a 22MnB5 metal sheet, and it was evaluated through a 3-point bending experiment. Progressive failure was observed in similar deflection on bending deformation to each one-sided reinforced specimen. After progressive failure, the tensile reinforced specimen was confirmed to separate the damaged CFRP patch and 22MnB5 sheet from the center of the flexure. The compression reinforced specimen didn't separate that CFRP patch and 22MnB5, and the strength reinforcement behavior was confirmed. In the compression reinforced specimen, damaged CFRP patches were observed at the center of flexure during bending deformation. As a result of checking the specimen of the compression reinforcement specimen with an optical microscope, It is confirmed that the damaged CFRP patch and the reinforced CFRP patch overlapped, resulting in a concentrated load. Through the experimental results, the 22MnB5 strength reinforcement characteristics according to the reinforcement position of the CFRP patch were confirmed.
OOA 공정을 통한 CFRTP 항공기 Frame 보강재 성형에 관한 연구
이환주,전용준,최현석,김동언,Lee, Hwan-Ju,Jeon, Yong-Jun,Choi, Hyun-Seok,Kim, Dong-Earn 한국금형공학회 2017 한국금형공학회지 Vol.11 No.2
Carbon fiber reinforced plastic (CFRP) is applied as structural material. CFRP is excellent in plane strength / stiffness and don't haves rust. Lightweight, rigid and robust at the same time as transportation material. Aluminum alloy and reinforcement material The application is increasing rapidly. In this study, the prototype of a semi - Monocoque structure frame, Longeron, Stringer, Skin of the aircraft, restraining the rigidity Clips of the aircraft was designated as the target product and the experiment was conducted. ln the experiment, (1) For CFRTP 3 points, data on heating, transfer, and cooling were measured using Thermo Couple, and optimum temperature required for flexible state was obtained. Heating was performed at a temperature 15% higher than the provided temperature. (2) By using a pneumatic press during molding, by dividing LH, center and RH according to the cooling time, thickness parameter of the target product due to the load is measured, and thickness control and time-deviations were analyzed and cross sections were observed with a low magnification microscope.