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전성식 公州大學校 工學硏究院 生産技術硏究所 2003 論文集 Vol.11 No.-
In this paper, a modified and representative unit cell model was employed to study the mechanical behaviour of closed-cell metallic foams with varying spatial density distribution as well as material imperfections. The density variation was assumed to follow a statistical probability distribution of the Gaussian type. A multiple cell finite element model, utilising the modified unit cell, was developed. The model exhibits deformation patterns similar to those observed in testing. The nominal stress-strain curves obtained from quasistatic compressive as well as tensile of the foam were compared with experimental findings and were found to be in good agreement only if the appropriate density distribution and volume fraction of internal imperfections are taken into account. Moreover, maximum tensile strength of the aluminium foam was found to be more sensitive to the volume fraction of imperfection than standard deviation of the density