Reproducibility of aluminum foam properties: Effect of precursor distribution on the structural anisotropy and the collapse stress and its dispersion
Reproducibility of aluminum foam properties: Effect of precursor distribution on the structural anisotropy and the collapse stress and its dispersion
复制标题
泡沫铝性能的再现性：前体分布对结构各向异性和塌陷应力及其分散的影响
DOI：
10.1016/j.msea.2010.05.073
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发表时间：
2010
期刊：
影响因子：
6.4
通讯作者：
R. Florek
中科院分区：
文献类型：
--
作者：
M. Nosko;F. Simančík;R. Florek
通过含有发泡剂的前体的发泡制造的泡沫铝的多孔结构在本质上是随机的，通常具有不同尺寸和形状的孔的随机分布，在泡沫性质的建模和预测中产生困难。在这项研究中，前体材料在模具中的初始位置对泡沫结构和压缩行为的影响进行了研究。结构表征结果表明，前驱体在模具中的位置和挤出方向对多孔陶瓷的孔隙率分布、表面表皮厚度和孔取向均有影响。此外，压缩试验表明，结构各向异性的显着影响的崩溃应力及其分散。如果加载平行于较厚的表面表皮或平行于优先孔取向进行，则泡沫的塌陷应力增加，导致塌陷应力的20%差异。如果加载是关于结构各向异性进行的，则可以显着降低崩溃应力的分散。
The porous structure of aluminum foam manufactured through the foaming of precursors containing blowing agent is stochastic in nature, usually with a random distribution of pores of different size and shape, creating difficulties in the modeling and prediction of foam properties. In this study, the effect of the initial location of the precursor material in the mold on the foam structure and compression behavior was investigated. Structural characterization showed that the porosity distribution, surface skin thickness and pore orientation was affected by the location of the precursors in the mold and by the extrusion direction of the precursors. Moreover, compression tests demonstrated a significant effect of the structural anisotropy on the collapse stress and its dispersion. The collapse stress of the foam increased if the loading was performed parallel to the thicker surface skin or parallel to the preferential pore orientation, leading to a 20% difference in collapse stress. The dispersion of the collapse stress could be significantly decreased if the loading was performed with regard to the structural anisotropy.