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Cell-structure and mechanical properties of closed-cell aluminum foam
引用本文:周芸,左孝青,孙加林,S.R.Nutt. Cell-structure and mechanical properties of closed-cell aluminum foam[J]. 中国有色金属学会会刊, 2004, 14(2): 340-344
作者姓名:周芸  左孝青  孙加林  S.R.Nutt
作者单位:Department of Materials Engineering,Department of Materials Engineering,Department of Materials Engineering,Materials Science Department Kunming University of Science and Technology,Kunming 650093,China,Kunming University of Science and Technology,Kunming 650093,China,Kunming University of Science and Technology,Kunming 650093,China,University of Southern California,Los Angeles,CA 90089-0241,USA
摘    要:1 INTRODUCTIONMetalfoamsexhibitunusualmechanical,ther mal,acoustic ,damping ,electricalandchemicalprop ertiesthatcannotbefoundinsolidmaterials .Thosespecialpropertiesmayleadtoavarietyofapplicationsinstructuralandfunctionalproducts.Closed cellalu minumfoamisalight massstructuralmaterialofgreatpromise .Itsdensityisonlyafractionofthatofthecorrespondingbulkmetal,butitsstrengthissuf ficientlyhightobeusedintheautomobileindustry ,buildingindustryandtransportation .Examplesoftheirapplicationsinc…

关 键 词:泡沫铝 单元结构 机械性能 泡沫金属

Cell-structure and mechanical properties of closed-cell aluminum foam
S.R.Nutt. Cell-structure and mechanical properties of closed-cell aluminum foam[J]. Transactions of Nonferrous Metals Society of China, 2004, 14(2): 340-344
Authors:S.R.Nutt
Abstract:The density, cell size and structure of closed-cell aluminum foam were measured by optical microscopy and image analysis. The properties and the mechanism of compressive deformation that occur in closed-cell aluminum foam were measured and discussed. The results show that the cell size of foam with density of 0.37 mg/m3 is distributed in the range of 0.5 - 4.0 mm. The cell size of foam with density of 0.33 mg/m3 is distributed in the range of 0.5 - 5.0 mm. The cell wall thickness of both types is 0.1 - 0.3 mm. The closed-cell aluminum foam almost belongs to isotropic one, with a variation of ±15% in elastic modulus and yield strength in longitudinal and transverse direction. Under compressive loading, foam materials show inhomogeneous macroscopic deformation. The site of the onset of local plastic deformation depends on the cell structure. The shape of cell is more important than size in determining the yielding susceptibility of the cells. At early stage of deformation,the deformation is localized in narrow bands having width of one cell's diameter, and outside the bands the cell still remains the original shape. The cells within bands experience large permanent deformation. The band normals are usually within 20° of the loading axis.
Keywords:aluminum foam  cell structure  mechanical properties
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