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RISS 인기검색어
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- 저자 : Teng Gao (검색결과 30 건)
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A study of the impact properties of adhesively-bonded aluminum alloy based on impact velocity
Teng Gao,Anthony J. Kinloch,Bamber R. K. Blackman,F. S. RODRIGUEZ SANCHEZ,이상교,조종두,방혜진,전성식,조재웅 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.2
In this study, an experiment and a simulation were carried out on colliding an adhesively-bonded tapered double cantilever beam(TDCB) at the impact velocities of 5 m/s, 7.5 m/s and 12.5 m/s. The analysis method of the corrected beam theory (CBT) was used toobtain the rate of energy release in the bonded area according to the crack progression, and a simulation was performed to determine themaximum strain energy during the impact analysis as a means to examine the mechanical properties of aluminium alloy. The experimentaldata were found to be higher than the simulation data. This is deemed to explicable by the fact that the adhesive strength was maintainedeven after the specimen separated in the experiment. Crack progression occurred, irrespective of the impact velocity, and highstrain energy occurred at the end of the bonded region, thereby causing the strain energy to increase in the final stages. Also, the maximumload applied on the pin and the maximum strain energy in the bonded area were shown increase at higher impact velocities. Theresults of the experiment and simulation performed in this study are expected to serve as important data in developing a safety design forcomposite materials that can help prevent the progression of cracks caused by impact.
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A Study on Fracture Behavior at the Composite Plates of CFRP and Aluminum Bonded with Sandwich Type
Teng Gao,박재웅,조재웅 한국정밀공학회 2017 International Journal of Precision Engineering and Vol.18 No.11
The weight of machinery such as the aircraft, automobiles etc., has a great impact on the consumption of fuel and electricity. Thus, we have been researching on the enhanced design to make the weight of aircraft and automobile lighter. It is quite important and urgent to enhance the overall performance for the purpose of significantly reducing the weight of the machine. The aim of this study is to analyze the mechanical behavior of the aluminum plate sandwich and the carbon fiber reinforced plastic sandwich and aluminum foam specimen through the compression simulation analysis. In experiment, the maximum load of the carbon fiber reinforced plastic sandwich was 49.15 kN, the maximum load of the aluminum sandwich was approximately 51.2 kN, the maximum load of the aluminum foam specimen was 3.27 kN while the load cell moved 12 mm as the rigid displacement. It was affirmed that the results of simulation and experiment were very similar. In simulation, the maximum equivalent stress of carbon fiber reinforced plastic sandwich was larger than the equivalent stress of aluminum plate sandwich. The analysis and the experimental results obtained from this study could be applied in many areas employing CFRP and aluminum plate.
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Teng Gao,조재웅 한국정밀공학회 2015 International Journal of Precision Engineering and Vol.16 No.8
In this study, an impact experiment was conducted on carbon fibre reinforced plastic sandwich composite material and a simulation was performed for verification purposes. Carbon fibre reinforced plastic is known to have more outstanding material characteristics than general metal in terms of non-rigidity, specific modulus, fatigue characteristics as well as wear-, heat- and corrosion-resistance. Also, it has a long fatigue lifetime and excellent environmental safety. For these reasons, it is used widely in aviation, national defence, automotive, sports and other industrial fields. In the experiment, impact energy was applied on fixed specimens in increments of 30J from 30J to 90J. The results showed that the specimen was penetrated by a striker with impact energy of 90J, but not with 30J and 60J. For the simulation, ANSYS was used to apply the same boundary condition as the actual case for a finite element analysis. The data obtained from the experiment and the simulation were found to be similar. Thus, it was deemed possible to use the results of the impact analysis on the carbon fibre reinforced plastic sandwich to predict the structural stability of such materials after various impacts. These results will not only be applicable in various fields, but also serve as important data in the development of safety design of composite materials.
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DOES CSR ALWAYS PROTECT FIRMS AGAINST NEGATIVE PUBLICITY?
Teng Gao,Lishan Xie,Patrick Poon 글로벌지식마케팅경영학회 2016 Global Marketing Conference Vol.2016 No.7
Previous research indicates that consumers may resist negative publicity when they perceive a firm to be socially responsible (Klein & Dawar, 2004; Chernev & Blair,2015). However, other research shows corporate social responsibility (CSR) may boomerang the damage of negative publicity (Sohn & Lariscy,2012). Firms may participate in CSR and it is important for market practitioners and researchers to understand the role of different types of CSR in minimizing the impact of negative publicity. This research aims to examine the moderating role of two types of CSR in the effect of negative publicity on consumer responses. An experiment with a 2 (negative publicity type: ability-related vs. morality-related) x 2 (CSR type: philanthropic donation vs. employee wellbeing) between-subjects factorial design was conducted in a major city of China. In the morality-related negative publicity and employee wellbeing condition, the participants were shown with employee wellbeing materials and a morality-related negatively publicized article about a fictitious hotel. Similar arrangements were setup for other different conditions. Then, consumer responses such as firm evaluation and patronage intention were measured. Results of two-way ANOVA revealed a significant interaction effect. The findings indicate that consumers’ patronage intention is lower when a morality-related negative publicity has happened to a firm having “philanthropic donation” type of CSR, and also when an ability-related negative publicity has happened to a firm having “employee wellbeing” type of CSR. Managerial
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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.
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알루미늄 합금으로 된 경사진 이중외팔보의 충돌에 대한 실험 및 해석
고등 ( Teng Gao ),조재웅 ( J U Cho ),전성식 ( Seong S Cheon ) 한국복합재료학회 2014 Composites research Vol.27 No.2
본 연구에서는 알루미늄 합금으로 된 경사진 이중외팔보의 충돌에 대해서 각각의 충격속도 2.5m/s, 7.5m/s, 12.5 m/s 별로 실험과 시뮬레이션 해석을 하였다. 접착부분에 발생하는 에너지 해방율과 응력을 평가하여 알루미늄 합금의 기계적 특성을 고찰하였다. 실험상에서는 접착 부분에서 에너지 해방율의 값이 높은 것으로 나타났다. 이는 실험에서 시험편이 분리된 후에도 접착력이 유지되는 특성 때문인 것으로 사료된다. 충격속도와 상관없이 균열이 진전하다가 접착된 부분의 끝에서 높은 응력을 발생하기 때문에 최대 등가응력은 마지막 단계에서는 올라간다. 본 연구에서의 실험 및 해석결과들은 충돌에 의한 균열 진전을 방지할 수 있는 복합재료에 대한 안전설계의 개발에 필요한 자료로 사료된다. This study is investigated by experiments and analyses at rates of 2.5m/s, 7.5m/s and 12.5m/s on the impact of tapered double cantilever beam specimens with aluminium alloy. It aims to examine the mechanical property of aluminum alloy by evaluating energy release rate and equivalent stress happened at the bonded part of specimen. Because bonding force remains after the separation of specimen, the energy release rate at the bonded part becomes highest. As crack propagates and the high stress happens at the end of the bonded part, the maximum equivalent stress becomes higher at the last stage, regardless of impact rate. These results of experiments and analyses are the data necessary to develop the safe design of composite material to prevent crack propagation due to impact.
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