• Title, Summary, Keyword: Aluminum Foam

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A Numerical Study on The Three Point Bending Behavior of Aluminum Foam Filled Stainless Steel Tube (알루미늄 폼으로 충진된 스테인레스 관의 3 점 굽힘 특성에 관한 수치적 연구)

  • Ha, San;Kim, Am-Kee;Cheon, Seong-Sik;Lee, Chang-Hun;Lee, Hyo-Jin;Cho, Seong-Seock
    • Proceedings of the KSME Conference
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    • pp.388-393
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    • 2004
  • A comprehensive numerical study on the three point bending behavior of Aluminum foam-filled stainless steel tube has been performed. Aluminium alloy foams with various densities were produced and their mechanical properites were evaluated. Finite element(FE) analysis of three point bending test was performed to evaluate bending behavior of foam filled cylindrical structures. Results showed that foam filling offered remarkable increase of bending resistance and enhanced the crashworthiness of the structure. It turned out to prevent the inward fold formation at the compression flange, resulted into the multiple propagating folds and increased the load carrying capacity.

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A Study on Fracture Characteristic of Aluminum Foam by Thickness (두께에 따른 알루미늄 폼의 파괴 특성에 관한 연구)

  • Gao, Teng;Cho, Jae Ung
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.39 no.10
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    • pp.971-977
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    • 2015
  • 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 finite-element 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.

Physical Modeling of Aluminum-Foam Generation (알루미늄 발포공정의 물리적 모델링)

  • Oak S. M.;Moon Y. H.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.297-300
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    • 2001
  • Physical modeling technique is applied to investigate foam generation in molten aluminum. By using room temperature water with specially designed equipment, the effects of stirrer type, fluid viscosity(glycerine added to water) and stirring velocity on foam generation behaviors are intensively analysed The distribution and size of bubbles varied with each process parameters but the most important parameters are stirring velocity and fluid viscosity. The results obtained from physical simulation have been confirmed by actual aluminum foam generation experiment at various process variables.

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Heat Transfer from a Fan-Aluminum Foam Heat Sink Assembly for CPU Cooling (CPU 냉각을 위한 홴-발포알루미늄 방열기 조합의 열전달 특성)

  • Kim, Seo-Yeong;Lee, Myeong-Ho;Baek, Jin-Uk;Lee, Gwan-Su
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.26 no.3
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    • pp.417-422
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    • 2002
  • The experiments have been carried out to evaluate the cooling performance of a fan-aluminum foam heat sink assembly in comparison with a conventional CPU cooler. In terms of the dimensionless surface temperature of the heater, the cooling performance of the aluminum foam heat sink is similar to that of the conventional one with much reduced weight. The optimum fin height is found to be strongly dependent on the fin height of the heat sink and flow characteristics of the cooling fan.

Impact Performance of a Crash Member Filled with Aluminum Foam (알루미늄 폼이 충전된 충돌부재의 충격흡수 성능)

  • Kim, N.H.;Kim, J.H.;Lee, J.K.;Kim, D.
    • Transactions of Materials Processing
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    • v.20 no.8
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    • pp.555-561
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    • 2011
  • The energy absorbing characteristics of crash members in a car collision play an important role in controlling the amount of damage to the passenger compartment. Crash members filled with aluminum foam are expected to have reduced mass while maintaining or even improving the crashworthiness compared to the conventional hollow-beam types. Finite element simulations are carried out in the present work to assess the improvement of crashworthiness by the use of aluminum foam fillers. The numerical results agreed well with experimental measurements. Parametric studies are conducted to analyze the effect of impact velocity, weld strength, and initiator on the crash response.

Sound-Insulation Performance of Aluminum Extruded Panel by Charging Foam in a High-speed Train (고속철도차량용 알루미늄 압출재의 차음성능에 대한 폼 충전효과)

  • Lee, Joong-Hyeok;Park, In-Seok;Kim, Seock-Hyun
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.582-585
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    • 2012
  • The aluminum extruded panel used for a high speed train shows the largest contribution to sound insulation performance of the train body. However, comparing with the flat panel having the same weight, the transmission loss falls sharply in the local resonance frequency band. Such fall of transmission loss can be improved by increasing the damping of local resonance. This study examines the charging effect of an urethane foam on the aluminum extruded panel of a high speed train. We charged the urethane foam with different mass density and in different way in the core part of the extruded panel. We measure the transmission loss and compare the sound insulation performance according to the density and charging method. Finally, Improvement effect of the transmission loss is compared and analysed in aspect of weight increment.

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Pressure Loss and Forced Convective Heat Transfer in an Annulus Filled with Aluminum Foam (발포 알루미늄이 삽입된 환형관에서의 압력손실 및 강제대류 열전달)

  • Noh Joo-Suk;Lee Kye-Bock;Lee Chung-Gu
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.17 no.9
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    • pp.855-862
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    • 2005
  • An experimental investigation has been carried out for aluminum foam heat sink inserted into the annulus to examine the feasibility as a heat sink for high performance forced water cooling in the annulus. The local wall temperature distribution, inlet and outlet pressures and temperatures, and heat transfer coefficients were measured for heat flux of 13.6, 18.9, 25.1, 31.4 $kw/m^2$ and Reynolds number ranged from 120 to 2000. Experimental results show that the friction factor is higher than clear annulus without aluminum foam, while the significant augmentation in Nu is obtained. This technique can be used for the compactness of the heat exchanger.

The Effects of Cell Sizes on Compression and Bending Strength of Aluminum Material (알루미늄 소재의 미세 기공 크기가 압축 및 굽힘 강도에 미치는 영향)

  • 전용필;강충길
    • Transactions of Materials Processing
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    • v.11 no.8
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    • pp.701-709
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    • 2002
  • Aluminium foam material is highly porous material, which has the complicated cellular structure defined by randomly distributed pores in metallic matrix. This structure gives the characteristic properties which cannot be achieved by any other conventional processes. As the properties of aluminium foam material significantly depend on its porosity, a desired profile of properties can be tailored by changing the foam density. But various defects lead to undesirable effects on the mechanical properties. Mechanical properties are dependent on cell sizes and aspect ratios. Therefore, this paper presents the effects of various processing parameters of various parameters on the mechanical properties. For the sake of this, combined stirring was used to fabricate aluminum foam materials by the parameters. Compression and bending tests were performed to investigate the effects of cell sizes and aspect ratios on the mechanical properties.