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첨가량에 따른 발포알루미늄의 최적 조건 선정과 비중의 차이에 대한 기계적 성질 변화 관찰
도복환(Do Bok-Hwan),윤종식(Youn Jong-Sik),김주현(Kim Joo-Hyun) 한국생산제조학회 2005 한국생산제조시스템학회 학술발표대회 논문집 Vol.2005 No.10
In this work, we are observed the changes in mass difference according to Al-foam's amount of Ca contents following the viscosity control of fusion, quality of foamed addition quantity, mixing, temperature tests, crucial influencing factors in determining foam-metal's size in the manufacturing process. In order to obtain the specimen, we are changed the amount of foam's from 0.2 to 0.25 to 0.3 accordingly foamed the metal the appropriate mass, and when considering the ordinary aluminum's content 2.7, this specimen shows the characteristics of ultra-lightweight metal, and changing mechanical characteristics according to the changing mass.
발포 알루미늄이 삽입된 환형관에서의 열전달 및 유동특성
노주석,한영희,이계복,이충구 한국에너지학회 2006 에너지공학 Vol.15 No.1
발포 알루미늄이 삽입된 환형관에서의 유동과 대류 열전달 특성을 실험적 연구를 수행하여 분석하고 heat sink로서의 실현 가능성을 검토하였다. 다른 기공밀도를 갖는 두 종류의 발포 알루미늄을 사용하여 유동과 열전달 특성을 파악하고 마찰계수와 열전달 관련 Nusselt 수를 Darcy 수, Reynolds 수, Prandtl 수의 함수로 상관식을 구하였다. 발포 알루미늄이 없는 경우에 비해 마찰계수는 증가하지만 Nusselt 수에서도 6에서 10배의 증가를 나타낸다. 따라서 열교환기의 크기가 제한되는 경우 열교환기에 발포알루미늄을 삽입하면 전열면적을 감소시킬 수 있으므로 열교환기를 소형화할 수 있다.
첨가량에 따른 발포알루미늄의 최적 조건 선정과 비중의 차이에 대한 기계적 성질 변화 관찰
도복환(Do Bok-Hwan),윤종식(Youn Jong-Sik),김주현(Kim Joo-Hyun) 한국생산제조학회 2005 한국공작기계학회 추계학술대회논문집 Vol.2005 No.-
In this work, we are observed the changes in mass difference according to Al-foam's amount of Ca contents following the viscosity control of fusion, quality of foamed addition quantity, mixing, temperature tests, crucial influencing factors in determining foam-metal's size in the manufacturing process. In order to obtain the specimen, we are changed the amount of foam's from 0.2 to 0.25 to 0.3 accordingly foamed the metal the appropriate mass, and when considering the ordinary aluminum's content 2.7, this specimen shows the characteristics of ultra-lightweight metal, and changing mechanical characteristics according to the changing mass.
고등(Teng Gao),조재웅(Jae Ung Cho) 대한기계학회 2015 大韓機械學會論文集A Vol.39 No.10
발포금속은 우수한 물리적 특성과 역학적 성능 때문에 많은 첨단기술 분야에 널리 사용되고 있다. 폐쇄형 알루미늄 폼은 발포금속 중에 하나이며, 우수한 충격에너지 흡수하는 성능 때문에 자동차와 항공기에 많이 쓰이고 있다. 본 연구에서는 폐쇄형 알루미늄 폼의 충격 실험을 통해 두께에 따른 기계적 특성을 분석하였으며, 검증으로 시뮬레이션 해석을 하였다. 시뮬레이션 해석 방법으로서는 ANSYS 를 이용하여 실험과 똑 같은 경계조건으로 유한요소해석을 진행하였다. 실험과 해석의 결과들을 비교해보면 10mm, 20mm, 30mm 인 경우에 20mm 인 경우는 제일 효율적인 것으로 사료된다. 20mm 의 경우가 시험편의 두께에 비하여 세가지 모델들의 경우에 있어 충격 에너지의 흡수가 가장 큰 것으로 나타났다. 본 연구의 결과들을 이용하면, 알루미늄 폼으로 된 기계 구조물의 개발에 필요한 자료를 제공할 수 있을 것으로 사료된다. Because foam metal has the excellent physical characteristics and mechanical performance, they are applied extensively into a lot of advanced technology areas. The aluminum foam with closed cell is one of the foam metals. It is applied widely into automobile and airplane because of the excellent absorption performance of impact energy. In this study, the mechanical characteristics by thickness was analyzed through the impact experiment of closed-cell aluminum foam, and the simulation analysis was performed for the verification. As the simulation analysis method, a finiteelement analysis was carried under the same boundary conditions as the experiment by using ANSYS. By comparing with the results of experiment and simulation, it was thought that the case of thickness of 20mm was the most efficient of among the cases of thicknesses of 10mm, 20mm and 30mm. At the case of thickness of 20mm, the absorption energy by comparing with the specimen thickness is shown to become the most among three models. By using the result of this study, it is thought that it can apply the material necessary to develop the mechanical structure with aluminum foam.
접착제로 접합된 이중외팔보 알루미늄폼의 파괴 거동에 관한 연구
방혜진(Hye-jin Bang),이상교(Sang-kyo Lee),조종두(Chongdu Cho),조재웅(Jae-ung Cho),최해규(Hae-kyu Choi) 대한기계학회 2014 大韓機械學會論文集A Vol.38 No.5
본 논문에서는 초기균열을 갖고 있는 폐포형 구조, 발포알루미늄의 축방향 기계적 거동을 실험 및 유한요소해석으로 연구하였다. 재료시험에서 MTS 사의 10kN Landmarks 를 사용하여, 모드 I 형상의 15mm/min 의 하중속도로 변위를 제어하였다. 또한 유한요소해석 범용프로그램인 ABAQUS 6.10 으로 3 차원 형상의 실험과 동일한 조건으로 모델을 구성하여 해석을 수행하였다. 실험의 축방향 변위-하중 그래프와 시간에 대한 균열 길이를 기반으로 에너지 해방률을 계산하였으며, 이 값을 해석에서 파손 에너지조건으로 사용하였다. 결과적으로 변위 값에 따른 하중 거동을 확인할 수 있었으며, 발포알루미늄이 접착제에 비해 상대적으로 큰 밀도와 탄성계수를 가지므로 발포알루미늄의 변형이 상대적으로 작다는 것을 확인할 수 있었다. In this study, closed-cell aluminum foam with an initial crack was investigated to produce an axial load-time graph. Using the 10-kN Landmarks of MTS Corporation, a 15-mm/min velocity of mode I shape was applied to the aluminum foam specimen using the displacement control method. ABAQUS 6.10 simulation was used to model and analyze the identical model in three dimensions under conditions identical to those of the experiment. The energy release rate was calculated on the basis of an axial load-displacement graph obtained from the experiment and a transient image of the crack length, and then an FE model was analyzed on the basis of this fracture energy condition. The relation between load and displacement was discussed; it was found that the aluminum foam deformed somewhat less than the adhesive layer owing to the difference in elastic modulus.
직접에너지적층 공정을 이용한 폐쇄형 알루미늄 폼 제작에 관한 연구
김화정,심도식 한국정밀공학회 2023 한국정밀공학회지 Vol.40 No.10
In this study, based on directed energy deposition (DED) technology, one of the additive manufacturing technologies, a porous material fabricated by mixing various aluminum alloys and foaming agent was manufactured. First, the foaming agent formed pores inside the deposited materials and differences in foaming characteristics were observed depending on the type of aluminum. Also, the foaming characteristics according to the laser power, which is a representative process variable, were analyzed. As a result, a closed-cell porous material with a maximum porosity at a laser power of 1,100 W was manufactured. Results of the compression test showed that the porous material made by the pores generated therein collapses to absorb energy, and the internal pores disappear to become high density. Therefore, Young’s modulus and yield stress were reduced by the pores inside the sample of pure aluminum and Al6063. However, it was found that the specific energy absorption, which is an advantage of the foamed materials, increased compared to non-porous materials. The findings of this study confirmed that it was possible to manufacture DED-applied foam materials using aluminum powder and a foaming agent.
도복환(Bok-Hwan Do),김주현(Joo-Hyun Kim) 한국생산제조학회 2006 한국생산제조학회지 Vol.15 No.1
In this work, we observed the changes in mass difference according to Al-foam’s amount of Ca contents which depends on the viscosity control of fusion, quality of foamed addition, mixing, temperature tests. These are crucial influencing factors in determining foam-metal’s size in the manufacturing process. In order to obtain the specimen, we changed the specific gravity from 0.2 to 0.3 for the study of the light weight, and obtained the optimal values of specific gravity, and then showed the mechanical characteristics of ultra-lightweight metal according to the changing mass. The optimal conditions for aluminum foam is when the addition of Ca content in 1.5wt% ~ 2.0wt%.
이진원(Jin-Won Lee),김태원(Tae-Won Kim) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
Heat transfer performance of an aluminum foam by porosity was investigated. Thermal conductivity was measured by the relative comparison technique which is one of the KS standard thermal conductivity measuring methods. Based on experimental results, modified scaling relationship model, respectively determined from the solid and fluid conduction mechanisms corresponding to the metal-wall and air, was suggested to represent the porosity effect on heat transfer property. By evaluating the effective thermal conductivity of the aluminum foam with pore density of 0.87, the existing scaling relationship model showed 3.83 W/m·K, and newly developed model was 1.14 W/m·K. Based on the prediction with experimental data of 1.40 W/m·K for the case, it was confirmed that the modified scaling relationship model described much more effectively the heat transfer property of the material.
C/S 몰비 및 알루미늄 분말 첨가율 변화에 따른 고온·고압 기포 콘크리트의 발포특성
윤현섭 ( Yoon Hyun-sub ),박종범 ( Pakr Jong-beom ),이광일 ( Lee Kwang-il ),양근혁 ( Yang Keun-hyeok ) 한국건축시공학회 2018 한국건축시공학회 학술발표대회 논문집 Vol.18 No.1
Test results showed that foaming ratio of autoclaved aerated concrete significantly affected by the CaO/Si<sub>2</sub>O (C/S) molar ratio of the component materials, indicating the greatest foaming ratio of 202% when the C/S ratio was 0.9.