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Radiation Efficiency of Surface Burning on a Foam Metal Matrix with Ceramic Coating
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作者 Vladimir Shmelev 《Energy and Power Engineering》 2017年第7期366-385,共20页
The modified empirical two-temperature model of surface burning on a foam metal matrix was proposed. The comparative experimental studies of radiation properties of both matrices without and with ceramic coating (alum... The modified empirical two-temperature model of surface burning on a foam metal matrix was proposed. The comparative experimental studies of radiation properties of both matrices without and with ceramic coating (alumina) were carried out. Measurement was conducted in different spectral ranges. The experimental results were compared with theoretical calculations. It was shown that the integral radiation efficiency of the matrix with ceramic coating was comparable with radiation efficiency of the matrix without any coating in the wide range of the firing rate and surpassed it on 30% - 40% at firing rate above 50 W/cm2. 展开更多
关键词 BURNING Device metal foam MATRIX RADIATION CERAMIC COATING
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Chebyshev polynomial-based Ritz method for thermal buckling and free vibration behaviors of metal foam beams
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作者 N.D.NGUYEN T.N.NGUYEN 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2024年第5期891-910,共20页
This study presents the Chebyshev polynomials-based Ritz method to examine the thermal buckling and free vibration characteristics of metal foam beams.The analyses include three models for porosity distribution and tw... This study presents the Chebyshev polynomials-based Ritz method to examine the thermal buckling and free vibration characteristics of metal foam beams.The analyses include three models for porosity distribution and two scenarios for thermal distribution.The material properties are assessed under two conditions,i.e.,temperature dependence and temperature independence.The theoretical framework for the beams is based on the higher-order shear deformation theory,which incorporates shear deformations with higher-order polynomials.The governing equations are established from the Lagrange equations,and the beam displacement fields are approximated by the Chebyshev polynomials.Numerical simulations are performed to evaluate the effects of thermal load,slenderness,boundary condition(BC),and porosity distribution on the buckling and vibration behaviors of metal foam beams.The findings highlight the significant influence of temperature-dependent(TD)material properties on metal foam beams'buckling and vibration responses. 展开更多
关键词 Ritz method Chebyshev function BUCKLING VIBRATION metal foam beam higher-order beam theory(HOBT)
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Compression properties of cost-efficient porous expanded clay reinforced AA7075 syntactic foams fabricated by industrial-oriented die casting technology
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作者 İsmail Cem Akgün Çağın Bolat Ali Gökşenli 《China Foundry》 SCIE EI CAS CSCD 2024年第1期60-70,共11页
In today’s manufacturing industries,hard competition between rival firms makes it compulsory for researchers to design lighter and cheaper machine components due to the megatrends of cost-effectiveness and anti-pollu... In today’s manufacturing industries,hard competition between rival firms makes it compulsory for researchers to design lighter and cheaper machine components due to the megatrends of cost-effectiveness and anti-pollution.At this point,aluminum syntactic foams(ASFs)are new-generation engineering composites and come into the upfront as a problem-solver.Owing to their features like low density,sufficient elongation,and perfect energy absorption ability,these advanced foams have been considerably seductive for many industrial sectors nowadays.In this study,an industrial-oriented automatic die casting technology was used for the first time to manufacture the combination of AA7075/porous expanded clay(PEC).Micro evaluations(optical and FESEM)reveal that there is a homogenous particle distribution in the foam samples,and inspections are compatible with the other ASF studies.Additionally,T6 aging heat treatment was operated on one half of the produced foams to explore the probable impact of aging on the compressive responses.Attained results show that PEC particles can be an alternative to expensive hollow spheres used in the previous works.Besides,a favorable relationship is ascertained between the aging treatment and mechanical properties such as compression strength and plateau strength. 展开更多
关键词 die casting porous materials metal matrix sytanctic foams expanded clay compressive deformation
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Indentation of sandwich beams with metal foam core
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作者 秦庆华 张建勋 +2 位作者 王正锦 李慧敏 郭丹 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第8期2440-2446,共7页
The quasi-static indentation behavior of sandwich beams with a metal foam core was investigated. An analytical model was developed to predict the large deflections of indention of the sandwich beams with a metal foam ... The quasi-static indentation behavior of sandwich beams with a metal foam core was investigated. An analytical model was developed to predict the large deflections of indention of the sandwich beams with a metal foam core subjected to a concentrated loading. The interaction of plastic bending and stretching in the local deformation regions of the face sheet was considered in the analytical model. Moreover, the effects of the shear strength of the foam core on the indentation behavior were discussed in detail. The finite element simulations were preformed to validate the theoretical model. Comparisons between the analytical predictions and finite element results were conducted and good agreement was achieved. The results show that the membrane force dominates indentation behavior of the sandwich beams when the maximum deflection exceeds the thickness of the face sheet. 展开更多
关键词 INDENTATION sandwich beam energy absorption metal foam large deflection
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A plastic indentation model for sandwich beams with metallic foam cores 被引量:5
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作者 Zhong-You Xie Ji-Lin Yu Zhi-Jun Zheng 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2011年第6期963-966,共4页
Light weight high performance sandwich composite structures have been used extensively in various load bearing applications.Experiments have shown that the indentation significantly reduces the load bearing capacity o... Light weight high performance sandwich composite structures have been used extensively in various load bearing applications.Experiments have shown that the indentation significantly reduces the load bearing capacity of sandwiched beams.In this paper,the indentation behavior of foam core sandwich beams without considering the globally axial and flexural deformation was analyzed using the principle of virtual velocities.A concisely theoretical solution of loading capacity and denting profile was presented.The denting load was found to be proportional to the square root of the denting depth.A finite element model was established to verify the prediction of the model.The load-indentation curves and the profiles of the dented zone predicted by theoretical model and numerical simulation are in good agreement. 展开更多
关键词 INDENTATION Sandwich beam metallic foam
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Mechanical Property of Foamed Metal 被引量:3
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作者 LIU Pei-sheng SANG Hai-bo 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2004年第3期53-58,共6页
A comprehensive study on the mechanical behavior of foamed metals was demonstrated.The relationship among their mechanical properties,preparation method,porosity and the structure was briefly studied as well.
关键词 foamed metal porous material porous metal cellular solid
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High rate and cycling stable Li metal anodes enabled with aluminum-zinc oxides modified copper foam 被引量:3
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作者 Songtao Lu Zhida Wang +5 位作者 He Yan Rui Wang Ke Lu Yingwen Cheng Wei Qin Xiaohong Wu 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2020年第2期87-92,共6页
Metallic Li is a promising anode material for high energy density batteries but it suffers from poor stability and formation of unsafe dendrites. Previous studies demonstrated that 3 D metal foams are able to improve ... Metallic Li is a promising anode material for high energy density batteries but it suffers from poor stability and formation of unsafe dendrites. Previous studies demonstrated that 3 D metal foams are able to improve the stability of Li metal but the properties of these foams are inherently limited. Here we report a facile surface modification approach via magnetron sputtering of mixed oxides that effectively modulate the properties of Cu foams for supporting Li metal with remarkable stability. We discovered that hybrid Li anodes with Li metal thermally infused to aluminum-zinc oxides(AZO) coated Cu foams have significantly improved stability and reactivity compared with pristine Li foils and Li infused to unmodified Cu foams. Full cells assembled with a Li Fe PO4 cathode and a hybrid anode maintained low and stable charge-transfer resistance(<50) during 500 cycles in carbonate electrolytes, and exhibited superior rate capability(~100 m Ah g-1 at 20 C) along with better electrochemical reversibility and surface stability. The AZO modified Cu foams had superior mechanical strength and afforded the hybrid anodes with minimized volume change without the formation of dendrites during battery cycling. The rational construction of surface architecture to precisely control Li plating and stripping may have great implications for the practical applications of Li metal batteries. 展开更多
关键词 Composite Lianode metal foamS Surface MODIFICATION Limetal BATTERIES 3D current COLLECTOR
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The effects of relative density of metal foams on the stresses and deformation of beam under bending 被引量:1
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作者 Aiyu Zhu Tianyou Fan Department of Mathematics,School of Science,Beijing Institute of Technology,P.O.Box 327,Beijing 100081,China Department of Physics,School of Science,Beijing Institute of Technology,P.O.Box 327,Beijing 100081,China 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2007年第4期409-414,共6页
The exact analytic solution of the pure bending beam of metallic foams is given. The effects of relative density of the material on stresses and deformation are revealed with the Triantafillou and Gibson constitutive ... The exact analytic solution of the pure bending beam of metallic foams is given. The effects of relative density of the material on stresses and deformation are revealed with the Triantafillou and Gibson constitutive law (TG model) taken as the analysis basis. Several examples for individual foams are discussed, showing the importance of compressibility of the cellular materials. One of the objects of this study is to generalize Hill's solution for incompressible plasticity to the case of compressible plasticity, and a kinematics parameter is brought into the analysis so that the velocity field can be determined. 展开更多
关键词 metal foams - Relative density Compressible plasticity Constitutive law - TG model
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Enhanced CO2 decomposition via metallic foamed electrode packed in self-cooling DBD plasma device 被引量:2
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作者 Shengjie ZHU Amin ZHOU +2 位作者 Feng YU Bin DAI Cunhua MA 《Plasma Science and Technology》 SCIE EI CAS CSCD 2019年第8期82-88,共7页
A self-cooling dielectric barrier discharge reactor, packed with foamed Cu and Ni mesh and operated at ambient conditions, was used for the composition of CO2 into CO and O2.The influences of power, frequency, and oth... A self-cooling dielectric barrier discharge reactor, packed with foamed Cu and Ni mesh and operated at ambient conditions, was used for the composition of CO2 into CO and O2.The influences of power, frequency, and other discharge characteristics were investigated in order to have a better understanding of the effect of the packing materials on CO2 decomposition.It is found that porous foamed Cu and Ni not only played a role as the carrier of energy transformation and electrode distributed in discharge gaps but also promoted the equilibrium shifting toward the product side to yield more CO by consuming some part of O2 and O radicals generated from the decomposition of CO2.The maximum CO2 decomposition rates of 48.6%and 49.2% and the maximum energy efficiency of 9.71% and 10.18% were obtained in the foamed Ni and Cu mesh, respectively. 展开更多
关键词 dielectric BARRIER DISCHARGE CO2 DECOMPOSITION metallic foamed materials energy efficiency
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Fabrication of Near Net Shape Metallic Foam via Plaster Mould
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作者 Young-Hwan Song Hwan-Goo Seon +2 位作者 Soo-Han Parka Min-Jae Jeong Bo-Young Hur 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2008年第3期335-339,共5页
Fabrication characteristics are unstable in direct foaming method. Therefore, most of near net-shape metallic foams are produced, and investigated by powder metallurgy. Direct foaming method, however, has many benefi... Fabrication characteristics are unstable in direct foaming method. Therefore, most of near net-shape metallic foams are produced, and investigated by powder metallurgy. Direct foaming method, however, has many benefits (i.e. reduce the unit cost of goods and fabrication process etc.) to fabrication of metallic foams. In this article, the fabrication characteristic of near net-shape metallic foams by direct foaming method was evaluated. Al and Plaster was used for base material and mould material respectively. Ca and TiH2 were added to molten Al as thickening and blowing agent for stable condition of bubbles. Thickening time was about 10 min with a stirring speed of 600 r/min. Foaming time was 30-120 s for evaluation of the optimum foaming condition. Amount of agent was selected by pre-experimental data. Porosity of near net-shape goods was measured by Archimedes method. On the other hand, it seems that increasing poring time and thickening agent make the poor porosity 展开更多
关键词 metal foam Near net shape foam POROSITY
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Exact Solution of a Cylinder Tube Made of Metallic Foam Under Inner Pressure
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作者 祝爱玉 范天佑 《Journal of Beijing Institute of Technology》 EI CAS 2008年第3期355-360,共6页
Exact solution of the stress and velocity fields of a cylinder tube of metallic foams under inner pressure is given in which the Triantafillou and Gibson constitutive law (TG model) for the material is taken as a ba... Exact solution of the stress and velocity fields of a cylinder tube of metallic foams under inner pressure is given in which the Triantafillou and Gibson constitutive law (TG model) for the material is taken as a basis of the calculation. The nonlinear equation is turned linear equation by introducing a kinematics parameter. The differences between the full condensed materials and the effect of the relative density are also discussed. 展开更多
关键词 metal foams constitutive law TG model the relative density kinematics parameter
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Performance Evaluation of Electromagnetic Shield Constructed from Open-Cell Metal Foam Based on Sphere Functions
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作者 Yuya Hanaoka Taku Itoh +2 位作者 Kohei Tateyama Susumu Nakata Keiko Watanabe 《Computer Modeling in Engineering & Sciences》 SCIE EI 2022年第7期43-53,共11页
This study evaluates the performance of a model of open-cell metal foams generated by sphere functions.To this end,an electromagnetic shield constructed from the model was inserted between two horn antennas in an elec... This study evaluates the performance of a model of open-cell metal foams generated by sphere functions.To this end,an electromagnetic shield constructed from the model was inserted between two horn antennas in an electromagnetic wave propagation simulation.The foam-hole diameter in the electromagnetic shield model was varied as d=2.5 and 5.0 mm,and the frequency of the electromagnetic waves was varied from 3 to 13 GHz.In the numerical experiments of shield effectiveness,the shields with foam holes of both diameters attenuated the electromagnetic waves across the studied frequency range.The shield effectiveness was enhanced at low frequencies and in the shield with smaller hole diameter. 展开更多
关键词 Electromagnetic propagation electromagnetic shielding materials metal foams numerical simulation
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Thermal Modeling and Analysis of Metal Foam Heat Sink with Thermal Equilibrium and Non-Equilibrium Models
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作者 Yongtong Li Liang Gong +2 位作者 Hui Lu Dexin Zhang Bin Ding 《Computer Modeling in Engineering & Sciences》 SCIE EI 2020年第5期895-912,共18页
In the present study,the thermal performance of metal foam heat sink was numerically investigated by adopting the local thermal non-equilibrium(LTNE)model and local thermal equilibrium(LTE)model.Temperature field dist... In the present study,the thermal performance of metal foam heat sink was numerically investigated by adopting the local thermal non-equilibrium(LTNE)model and local thermal equilibrium(LTE)model.Temperature field distributions and temperature difference field distributions of solid and fluid phases were presented.Detailed thermal performance comparisons based on the LTE and LTNE models were evaluated by considering the effects of the relevant metal foam morphological and channel geometrical parameters.Results indicate that a distinct temperature difference exists between the solid and fluid phases when the LTNE effect is pronounced.The average Nusselt numbers predicted by both the LTE and LTNE models are approaching with the increase of porosity,pore density,Reynolds number,large thermal conductivity ratio,and large aspect ratio.This is attributed to the significant reduction of the interstitial convective thermal resistance between the solid and fluid phases,as a result,the LTE model can replace the LTNE model for thermal modeling in these conditions.In addition,the overall thermal performance assessment of metal foam heat sink is compared with the non-porous heat sink,and it shows that the thermal performance factor of metal foam heat sink is approximately two times of the non-porous heat sink. 展开更多
关键词 metal foam LTE and LTNE heat transfer numerical simulation
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Preparation of open-cell metal foams by investment cast
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作者 Lucai WANG Haijuan LI +1 位作者 Fang Wang Jianfu REN 《China Foundry》 SCIE CAS 2005年第1期56-59,共4页
Metal foams are a new kind of materials with low densities and novel physical, mechanical, thermal, electrical and acoustic properties. They can be divided into closed and open cell structures. In this paper the open ... Metal foams are a new kind of materials with low densities and novel physical, mechanical, thermal, electrical and acoustic properties. They can be divided into closed and open cell structures. In this paper the open cell structures, called sponges, were treated. A new technique to manufacture sponges by plaster investment casting was described. Experimental results show that it is essential to make a sound plaster mould by casting plaster slurry into the polyurethane foams and infiltrate the open channels of the baked plaster mold by molten metal. The optimal processes include plaster slurry preparation, plaster mold baking, and molten metal infiltration. The sponge sample with porosity of 97% is presented. 展开更多
关键词 aluminum foamS Open-cell metal foamS INVESTMENT CASTING
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Low-velocity impact of rectangular foam-filled fiber metal laminate tubes
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作者 Jianxun ZHANG Haoyuan GUO 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2021年第12期1733-1742,共10页
Through theoretical analysis and finite element simulation,the low-velocity impact of rectangular foam-filled fiber metal laminate(FML)tubes is studied in this paper.According to the rigid-plastic material approximati... Through theoretical analysis and finite element simulation,the low-velocity impact of rectangular foam-filled fiber metal laminate(FML)tubes is studied in this paper.According to the rigid-plastic material approximation with modifications,simple analytical solutions are obtained for the dynamic response of rectangular foam-filled FML tubes.The numerical calculations for low-velocity impact of rectangular foam-filled FML tubes are conducted.The accuracy of analytical solutions and numerical results is verified by each other.Finally,the effects of the metal volume fraction of FMLs,the number of the metal layers in FMLs,and the foam strength on the dynamic response of foam-filled tubes are discussed through the analytical model in details.It is shown that the force increases with the increase in the metal volume fraction in FMLs,the number of the metal layers in FML,and the foam strength for the given deflection. 展开更多
关键词 fiber metal laminate(FML)tube metal foam low-velocity impact energy absorption
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Elasto-plastic analysis of crack in metallic foams
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作者 解凌云 孙俊君 +1 位作者 孙竹凤 范天佑 《Journal of Beijing Institute of Technology》 EI CAS 2012年第3期298-301,共4页
To determine the solutions of the well-known problem of a finite width strip with single edge crack,some results on elasto-plastic fracture analysis for metallic foams are reported.Meanwhile,in order to discuss and pu... To determine the solutions of the well-known problem of a finite width strip with single edge crack,some results on elasto-plastic fracture analysis for metallic foams are reported.Meanwhile,in order to discuss and put an insight into the nonlinear fracture analysis,the Dugdale model for plastic deformation of this configuration for metallic foams is recommended and solved.Combining the asymptotic solution with the Dugdale model and elastic solution,the stress field in the plastic zone and the size of the plastic zone are expressed as analytical forms.Based on Williams expansion method,the estimate of the scale factor is also completed and analyzed.In view of these analytical solutions,the results show the scale factor is a useful parameter for the fracture theory of metallic foams. 展开更多
关键词 metallic foams crack Dugdale model asymptotic solution
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Microstructural Study of the Intermetallic Bonding Between AI Foam and Low Carbon Steel
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作者 Michele Monno Valerio Mussi +2 位作者 Daniela Negri Luca Zampori Giovanni Dotelli 《材料科学与工程(中英文A版)》 2013年第8期531-539,共9页
关键词 金属间化合物层 泡沫铝 低碳钢 显微组织 AI 微观结构特征 扫描电子显微镜 粘结
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A Modified Kelvin Model for Thermal Performance Simulation of High Mechanical Property Open-Cell Metal Foams
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作者 Chuan Zhang Feng Zhu +1 位作者 Houssem Badreddine Xiaolu Gong 《Journal of Materials Science and Chemical Engineering》 2015年第7期113-118,共6页
This paper proposes a modified Kelvin model for high mechanical property open-cell metal foams and investigates its application in thermal simulations. The thermal conductivity is simulated based on the steady state m... This paper proposes a modified Kelvin model for high mechanical property open-cell metal foams and investigates its application in thermal simulations. The thermal conductivity is simulated based on the steady state method and the results are consistent with experimental values. The melting process of phase change materials (PCMs) in Kelvin model and its modified model is numerically investigated under a temperature constant heat resource. By detecting the temperature variations, it shows that the metal foam greatly improves the heat transfer in energy storage systems. Besides, the comparison of the melting process in two foam models indicates that the systems based on high mechanical property metal foams have a shorter melting time. The melting process of paraffin in modified Kelvin metal foam models with three different porosities (65%, 70% and 75%) are numerically analyzed and compared. 展开更多
关键词 Simulation metal foam Phase CHANGE Materials (PCMs) MELTING HEAT TRANSFER
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基于LBM的泡沫金属与翅片相变储能系统性能对比分析 被引量:1
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作者 张金亚 周文博 程紫漪漪 《储能科学与技术》 CAS CSCD 北大核心 2024年第2期598-607,共10页
为了研究翅片和泡沫金属铜对相变储能系统性能的影响,使用四参数随机生长法(QSGS)构建了孔隙密度(PPI)分别为20PPI、30PPI的泡沫铜复合相变材料模型,并构建了等铜质量的翅片相变材料模型。在此基础上,采用格子玻尔兹曼(LBM)数值模拟方... 为了研究翅片和泡沫金属铜对相变储能系统性能的影响,使用四参数随机生长法(QSGS)构建了孔隙密度(PPI)分别为20PPI、30PPI的泡沫铜复合相变材料模型,并构建了等铜质量的翅片相变材料模型。在此基础上,采用格子玻尔兹曼(LBM)数值模拟方法对相变材料(PCM)的储/放热过程进行了数值模拟,基于努塞尔数、液相率、PCM流动速度、PCM熔化/凝固时间对比分析了添加翅片以及添加泡沫金属结构对相变材料换热性能的影响。结果表明,在储热过程中,由于泡沫金属的存在会抑制熔化过程中对流换热的发展,双翅片结构的努塞尔数高于泡沫金属结构,熔化时间更短,相比于20PPI、30PPI泡沫铜复合相变材料分别缩短了28.55%、17.5%;在放热过程中,泡沫金属的存在会增加热传导面积,泡沫金属结构的凝固速度高于翅片结构,30PPI泡沫金属结构的凝固时间相比于翅片、20PPI泡沫铜复合相变材料分别缩短了65.80%、20.24%。综合考虑储放热两个过程,30PPI泡沫金属结构的总储放热时间最短,相比于翅片、20PPI泡沫铜复合相变材料分别缩短了27.81%、15.32%。在耗费相同金属材料的条件下,采用泡沫结构是更为有效的提升储能效率的手段。 展开更多
关键词 格子玻尔兹曼 四参数随机生长法 翅片 泡沫金属 相变储能系统
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含强化肋的PCM相变储热与传热特性数值研究
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作者 张永春 董文利 +3 位作者 孙涛 梁国安 尹迪 周小明 《南京师大学报(自然科学版)》 CAS 北大核心 2024年第2期8-16,共9页
为了有效提升PCM相变储热器的性能,本文采用多种金属翅片对相变过程进行强化,并采用焓-多孔介质模型对相变储热过程进行了数值模拟,分析了不同金属材料和不同基体孔隙率对相变储热及传热特性的影响.研究结果表明,采用金属泡沫强化翅片... 为了有效提升PCM相变储热器的性能,本文采用多种金属翅片对相变过程进行强化,并采用焓-多孔介质模型对相变储热过程进行了数值模拟,分析了不同金属材料和不同基体孔隙率对相变储热及传热特性的影响.研究结果表明,采用金属泡沫强化翅片能够增强导热和对流效应,优化流场对流涡分布,储热器相变储热时间大大缩短,耗时仅为无翅片工况的16.8%;采用铜金属泡沫翅片的储能效率略优于铝金属泡沫翅片,储热时间缩短3.47%;强化翅片孔隙率对储热性能影响较弱,孔隙率为0.4时最优,孔隙率为0.6时次之,孔隙率为0.8时最差. 展开更多
关键词 相变储能 金属泡沫 翅片 孔隙率 石蜡
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