The Experts below are selected from a list of 276 Experts worldwide ranked by ideXlab platform
Michael Richard Bambach - One of the best experts on this subject based on the ideXlab platform.
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axial capacity and crushing behavior of Metal Fiber square tubes steel stainless steel and aluminum with cfrp
Composites Part B-engineering, 2010Co-Authors: Michael Richard BambachAbstract:Abstract Composite Metal-carbon Fiber reinforced polymer (CFRP) tubes combine the benefits of the high strength to weight ratio of the Fiber/resin composite and the stable, ductile plastic collapse mechanism of the Metal, to form a composite tube with high strength and energy absorption capability. This paper investigates the axial capacity and crushing behavior of square hollow section (SHS) tubes composed of composite steel-CFRP, stainless steel-CFRP and aluminum-CFRP. Experiments of tubes with different Metal SHS geometries and two different matrix layouts of carbon Fibers are described, and a general theory to predict the compression buckling, axial capacity, axial collapse and mean crush load of Metal–Fiber square tubes is developed and validated against the experimental results. It is shown that carbon Fiber may be successfully externally bonded to Metal SHS, and such application may be provided to improve the performance of existing structures, or to design new structures with enhanced strength-weight and energy absorption-weight ratios. Comparisons are made between the performance of the different types of Metals, SHS geometries and carbon Fiber matrix layouts.
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Axial capacity and crushing behavior of Metal–Fiber square tubes – Steel, stainless steel and aluminum with CFRP
Composites Part B-engineering, 2010Co-Authors: Michael Richard BambachAbstract:Abstract Composite Metal-carbon Fiber reinforced polymer (CFRP) tubes combine the benefits of the high strength to weight ratio of the Fiber/resin composite and the stable, ductile plastic collapse mechanism of the Metal, to form a composite tube with high strength and energy absorption capability. This paper investigates the axial capacity and crushing behavior of square hollow section (SHS) tubes composed of composite steel-CFRP, stainless steel-CFRP and aluminum-CFRP. Experiments of tubes with different Metal SHS geometries and two different matrix layouts of carbon Fibers are described, and a general theory to predict the compression buckling, axial capacity, axial collapse and mean crush load of Metal–Fiber square tubes is developed and validated against the experimental results. It is shown that carbon Fiber may be successfully externally bonded to Metal SHS, and such application may be provided to improve the performance of existing structures, or to design new structures with enhanced strength-weight and energy absorption-weight ratios. Comparisons are made between the performance of the different types of Metals, SHS geometries and carbon Fiber matrix layouts.
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Axial capacity and crushing behavior of Metal–Fiber square tubes – Steel, stainless steel and aluminum with CFRP
Composites Part B-engineering, 2010Co-Authors: Michael Richard BambachAbstract:Abstract Composite Metal-carbon Fiber reinforced polymer (CFRP) tubes combine the benefits of the high strength to weight ratio of the Fiber/resin composite and the stable, ductile plastic collapse mechanism of the Metal, to form a composite tube with high strength and energy absorption capability. This paper investigates the axial capacity and crushing behavior of square hollow section (SHS) tubes composed of composite steel-CFRP, stainless steel-CFRP and aluminum-CFRP. Experiments of tubes with different Metal SHS geometries and two different matrix layouts of carbon Fibers are described, and a general theory to predict the compression buckling, axial capacity, axial collapse and mean crush load of Metal–Fiber square tubes is developed and validated against the experimental results. It is shown that carbon Fiber may be successfully externally bonded to Metal SHS, and such application may be provided to improve the performance of existing structures, or to design new structures with enhanced strength-weight and energy absorption-weight ratios. Comparisons are made between the performance of the different types of Metals, SHS geometries and carbon Fiber matrix layouts.
Wei Zhou - One of the best experts on this subject based on the ideXlab platform.
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compressive properties of porous Metal Fiber sintered sheet produced by solid state sintering process
Materials & Design, 2012Co-Authors: Wei Zhou, Yong Tang, Rong Song, Lelun JiangAbstract:Abstract A novel porous Metal Fiber sintered sheet (PMFSS) with three-dimensional reticulated structure was fabricated by using solid-state sintering method of copper Fibers. Uniaxial compressive test was carried out to investigate the effects of porosity and manufacturing parameters on the compressive properties of PMFSS. During the compressive process, it was found that the PMFSS initially exhibited short-term elastic deformation, and then quickly entered into the compact densification deformation stage. The stress–strain plots showed no obvious yield stage in the whole uniaxial compressive process. Under given stress, the PMFSS with higher porosity exhibited higher strain, hence implying lower effective stiffness. Additionally, our results showed that higher sintering temperature or longer sintering time would soften the PMFSS.
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Characterization of electrical conductivity of porous Metal Fiber sintered sheet using four-point probe method
Materials & Design, 2012Co-Authors: Wei Zhou, Yong Tang, Rong Song, Lelun Jiang, Kwan San Hui, Kwun Nam HuiAbstract:Novel porous Metal Fiber sintered sheets (PMFSSs) with different porosities were fabricated by sintering copper Fibers. Using four-point probe method, comparative study was conducted to investigate the effects of probe spacing, porosity, and sintering condition on the electrical conductivity of PMFSS. Our experimental results showed that probe spacing plays an important role in determining the electrical conductivity. Uniform probe spacing was adopted in order to reduce the error caused by non-uniformity of probe spacing. The measured electrical conductivity was found to decrease with increasing porosity ranging from 70% to 90% for the PMFSS produced under the same sintering condition. Our experimental results were found to agree well with the theoretical prediction by Liu’s model for the PMFSS with different porosities. The effect of sintering condition on electrical conductivity was also investigated. It was revealed that higher sintering temperature or longer holding time yields higher electrical conductivity of PMFSS.
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experimental investigation on uniaxial tensile properties of high porosity Metal Fiber sintered sheet
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2009Co-Authors: Wei Zhou, Yong Tang, Minqiang Pan, Xiaoling Wei, Jianhua XiangAbstract:Abstract A novel porous Metal Fiber sintered sheet (PMFSS) with a three-dimensional network structure has been produced via solid-state sintering of copper Fibers. The copper Fibers, approximately 100 μm in diameter, were fabricated using the cutting method. In this study, a uniaxial tensile test was used to study the tensile fracture process of the PMFSS. The effect of the porosity and sintering parameters on the tensile properties of the PMFSS was investigated in detail. It was found that the tensile strength of the PMFSS decreased significantly with an increase in the porosity, but the elongation remained relatively constant with different porosities. In addition, for sintering temperature between 700 °C and 900 °C, the tensile strength increased with increasing sintering temperature and decreased with increasing sintering time.
Yong Tang - One of the best experts on this subject based on the ideXlab platform.
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Experimental Study on Tensile Properties of a Novel Porous Metal Fiber/Powder Sintered Composite Sheet.
Materials (Basel Switzerland), 2016Co-Authors: Zou Shuiping, Zhenping Wan, Yong TangAbstract:A novel porous Metal Fiber/powder sintered composite sheet (PMFPSCS) is developed by sintering a mixture of a porous Metal Fiber sintered sheet (PMFSS) and copper powders with particles of a spherical shape. The characteristics of the PMFPSCS including its microstructure, sintering density and porosity are investigated. A uniaxial tensile test is carried out to study the tensile behaviors of the PMFPSCS. The deformation and failure mechanisms of the PMFSCS are discussed. Experimental results show that the PMFPSCS successively experiences an elastic stage, hardening stage, and fracture stage under tension. The tensile strength of the PMFPSCS is determined by a reticulated skeleton of Fibers and reinforcement of copper powders. With the porosity of the PMFSS increasing, the tensile strength of the PMFPSCS decreases, whereas the reinforcement of copper powders increases. At the elastic stage, the structural elastic deformation is dominant, and at the hardening stage, the plastic deformation is composed of the structural deformation and the copper Fibers’ plastic deformation. The fracture of the PMFPSCS is mainly caused by the breaking of sintering joints.
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experimental investigation on the thermal performance of a heat sink filled with porous Metal Fiber sintered felt paraffin composite phase change material
Applied Energy, 2016Co-Authors: Hongfei Wang, Yong Tang, Fanxu Wang, Wei YuaAbstract:Phase change material (PCM)-based heat sinks have the potential to provide reliable thermal management for electronic devices. However, the low thermal conductivity of PCMs hampers their use in large-volume or high-power devices. Embedding a PCM in a porous matrix is an efficient method for enhancing heat dissipation in a passive cooling application. In this study, the copper Fibers with ample antler microstructures on their surface were first introduced into the phase change heat transfer enhancement technology. The enhanced heat transfer performance of a PCM embedded in a porous Metal Fiber sintered felt (PMFSF) was experimentally investigated. Paraffin/PMFSF composite PCM (MF-PCM) was prepared, and three types of heat sinks (filled with MF-PCM, filled with paraffin, and empty) were tested under four power levels. The effect of the porosity was also investigated. It was found that the addition of PMFSF enhanced heat transfer to the PCM, leading to lower heat source temperature. The improvement of heat transfer by MF-PCM is more evident under larger heat flux. Before melting is completed, lower heat source temperature and temperature gradient is achieved for the heat sink with low porosity, while longer duration of temperature control region is achieved in the case of the heat sink with the higher porosity. The time-averaged effective thermal resistance of the heat sink with paraffin is higher than that of the heat sinks with MF-PCM. All these results show the enormous potential of using PMFSF to replace Metal foams, thus offering a new porous Metal matrix to enhance the thermal conduction of PCMs.
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compressive properties of porous Metal Fiber sintered sheet produced by solid state sintering process
Materials & Design, 2012Co-Authors: Wei Zhou, Yong Tang, Rong Song, Lelun JiangAbstract:Abstract A novel porous Metal Fiber sintered sheet (PMFSS) with three-dimensional reticulated structure was fabricated by using solid-state sintering method of copper Fibers. Uniaxial compressive test was carried out to investigate the effects of porosity and manufacturing parameters on the compressive properties of PMFSS. During the compressive process, it was found that the PMFSS initially exhibited short-term elastic deformation, and then quickly entered into the compact densification deformation stage. The stress–strain plots showed no obvious yield stage in the whole uniaxial compressive process. Under given stress, the PMFSS with higher porosity exhibited higher strain, hence implying lower effective stiffness. Additionally, our results showed that higher sintering temperature or longer sintering time would soften the PMFSS.
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Characterization of electrical conductivity of porous Metal Fiber sintered sheet using four-point probe method
Materials & Design, 2012Co-Authors: Wei Zhou, Yong Tang, Rong Song, Lelun Jiang, Kwan San Hui, Kwun Nam HuiAbstract:Novel porous Metal Fiber sintered sheets (PMFSSs) with different porosities were fabricated by sintering copper Fibers. Using four-point probe method, comparative study was conducted to investigate the effects of probe spacing, porosity, and sintering condition on the electrical conductivity of PMFSS. Our experimental results showed that probe spacing plays an important role in determining the electrical conductivity. Uniform probe spacing was adopted in order to reduce the error caused by non-uniformity of probe spacing. The measured electrical conductivity was found to decrease with increasing porosity ranging from 70% to 90% for the PMFSS produced under the same sintering condition. Our experimental results were found to agree well with the theoretical prediction by Liu’s model for the PMFSS with different porosities. The effect of sintering condition on electrical conductivity was also investigated. It was revealed that higher sintering temperature or longer holding time yields higher electrical conductivity of PMFSS.
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an innovative fabrication process of porous Metal Fiber sintered felts with three dimensional reticulated structure
Materials and Manufacturing Processes, 2010Co-Authors: Yong Tang, Jianhua Xiang, Wangyu LiuAbstract:A novel porous Metal Fiber sintered felt (PMFSF) with a three-dimensional reticulated structure has been produced by the solid-state sintering of copper Fibers. The copper Fibers, with several microstructures distributed onto the surface, were fabricated using the cutting method. The Scanning Electron Microscope (SEM) results revealed that there were two kinds of sintering joints present in the PMFSFs: Fiber-to-Fiber surface contact and crossing Fiber meshing. In the sintering process, the surface microstructures of the Fibers helped to improve the forming process of the PMFSFs, as a result of high surface energy. Furthermore, the effect of different sintering parameters on the forming process of the PMFSFs was studied in detail, including the sintering temperature and holding time. The sintering temperatures had a significant influence on the surface microstructures of single Fiber and specific surface area of the PMFSFs, but the holding time did not. The optimal PMFSF with a three-dimensional reticulate...
H.p. Tang - One of the best experts on this subject based on the ideXlab platform.
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Gradient-structural optimization of Metal Fiber porous materials for sound absorption
Powder Technology, 2016Co-Authors: Jilei Zhu, H.p. Tang, Tengfei Bao, Jun Sun, Jianzhong Wang, Weidong SongAbstract:Metal Fiber porous material with full inter-connected pore structure, is a kind of attractive sound-absorbing material sintered by powder Metallurgy process. In order to improve the sound absorption performance, the stainless steel Fibers with different diameters were used to fabricate porous sound-absorbing materials with gradient pore structures in this paper. Two or three layers of sintered Fiber porous plats with different pore structures were superposed in a certain sequence and then sintered to gradient porous materials. The effects of gradient pore structure on the sound absorption performance were also investigated. The results show that the gradient porous structure can effectively improve the sound absorption performance, and the direction and quantity of the pore gradient interface also exhibit remarkable effects on the sound absorption performance. The sound waves repeatedly reflect in the porous media between the gradient interfaces, which contributes to sound absorption improvement.
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effect of characterization of porous Metal Fiber media on sound absorption coefficient
International Journal of Modern Physics B, 2015Co-Authors: Q B Ao, H.p. TangAbstract:Porous Metal Fiber media (PMFM) is a kind of advanced structural and functional material, and it has attracted a wide spread attention owing to excellent sound absorption performance. The sound absorption property of PMFM is mainly influenced by the Fiber diameter, the average pore size and thickness of PMFM. In the paper, three stainless steel Fibers with the diameters (∅) of 8, 12 and 20 μm were used to make PMFM with the average pore sizes of 10, 20, 30 and 40 μm and the thicknesses of 1, 2 and 3 mm by air-laid and sintering processes. The sound absorption coefficients of PMFM were tested in impedance tube using two-microphone transfer-function method according to ISO 10534-2 and ASTM E1050-98 international standards at room temperature. The results show that when the frequency ranges from 50 Hz to 6,400 Hz in material with the average pore size of 20 μm and the thickness of 3 mm and the Fiber diameter of ∅8 μm, the average sound absorption coefficient is the highest.
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Progress in research of Metal Fibers air –laid process
Procedia Engineering, 2012Co-Authors: Jilei Zhu, H.p. Tang, Jun Sun, Jianzhong Wang, Zhi HaoAbstract:Abstract As a new type of porous Metals, Fiber Metal porous materials were applied for filtration and separation, sound absorption, enhanced heat and mass transfer. The application performances of porous Metal Fiber materials depend on its pore structure characteristics. The webbing is the first step of porous Metal Fiber materials fabrication, which determines the pore structure. Air-laid is the most common method to Metal Fiber webbing, the Fibers disperse, suspend and sediment to Metal Fiber felt with pore structure with air flow. At present, the research on process of Metal Fiber air-laid is far from mature. Metal Fiber porous material cannot be prepared for effective guidance practice. This paper reviewed the research on the Fiber movement and sedimentation in the flow field to provide reference for subsequent in-depth study.
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progress of application researches of porous Fiber Metals
Materials, 2011Co-Authors: Zhengping Xi, H.p. Tang, Qingbo Ao, Jianyong Wang, Cheng LiAbstract:Metal Fiber porous materials with intrinsic properties of Metal and functional properties of porous materials have received a great deal of attention in the fundamental research and industry applications. With developments of the preparation technologies and industrial requirements, porous Fiber Metals with excellent properties are developed and applied in many industry areas, e.g., sound absorption, heat transfer, energy absorption and lightweight structures. The applied research progress of the Metal Fiber porous materials in such application areas based on the recent work in our group was reviewed in this paper.
Weidong Song - One of the best experts on this subject based on the ideXlab platform.
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Gradient-structural optimization of Metal Fiber porous materials for sound absorption
Powder Technology, 2016Co-Authors: Jilei Zhu, H.p. Tang, Tengfei Bao, Jun Sun, Jianzhong Wang, Weidong SongAbstract:Metal Fiber porous material with full inter-connected pore structure, is a kind of attractive sound-absorbing material sintered by powder Metallurgy process. In order to improve the sound absorption performance, the stainless steel Fibers with different diameters were used to fabricate porous sound-absorbing materials with gradient pore structures in this paper. Two or three layers of sintered Fiber porous plats with different pore structures were superposed in a certain sequence and then sintered to gradient porous materials. The effects of gradient pore structure on the sound absorption performance were also investigated. The results show that the gradient porous structure can effectively improve the sound absorption performance, and the direction and quantity of the pore gradient interface also exhibit remarkable effects on the sound absorption performance. The sound waves repeatedly reflect in the porous media between the gradient interfaces, which contributes to sound absorption improvement.