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首页> 外文会议>Symposium on Cellular Metals and Polymers; 20041012-14; Furth(DE) >Structure evaluation of Aluminium Foams and Relationships to Compression Strength
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Structure evaluation of Aluminium Foams and Relationships to Compression Strength

机译：铝泡沫的结构评价及其与抗压强度的关系

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摘要

The present paper highlights results from the priority program "Cellular Metals" of the Deutsche Forschungsgemeinschaft (DFG SPP 1075). The aim of the present study is to present the possibilities of a statistically secured approach to estimate the compression plateau strength of aluminium foams and to correlate its values with the hierarchical foam structure. The paper describes the foam structure investigations which were carried out on different aluminium foams (alloys AlMgSi0.5 and AlSi7) produced according to a powder-metallurgical route (patented by the Fraunhofer-Institute in Bremen), and also the corresponding compression tests. The macroscopic pore structure formation was studied by using stochastic methods of quantitative metallography. The microstructure of the cells walls was examined by means of optical microscopy and high-resolution scanning electron microscopy. The plateau stress is primarily determined by the global density of the foam linked to the average pore size which decreases with increasing density. Under compression, the upper plateau stress is reached when collapse inside of a deformation band formed in the early stress/strain response occurs for the first time. The collapse originates from a weak spot in a pore understood as a volume dependent inhomogeneity. For this reason the plateau stress is also volume dependent. This correlation advises the application of Weibull statistics determining the characteristic value of the plateau stress.
机译：本白皮书重点介绍了德国科学基金会（DFG SPP 1075）的优先项目“蜂窝金属”的结果。本研究的目的是提出一种统计上可靠的方法来评估泡沫铝的压缩平稳强度并将其值与泡沫结构的等级相关联的可能性。本文介绍了根据粉末冶金路线（不来梅的弗劳恩霍夫研究所（Fraunhofer-Institute）获得专利）生产的不同铝泡沫（铝合金AlMgSi0.5和AlSi7）进行的泡沫结构研究，以及相应的压缩试验。使用随机金相学方法研究了宏观孔结构的形成。通过光学显微镜和高分辨率扫描电子显微镜检查细胞壁的微观结构。平台应力主要由与平均孔径相关的泡沫的整体密度决定，该平均孔径随密度的增加而减小。在压缩下，当第一次在早期应力/应变响应中形成的变形带内部塌陷时，就达到了上平台应力。塌陷起源于孔中的弱点，这被理解为与体积有关的不均匀性。因此，平台应力也取决于体积。这种相关性建议使用Weibull统计数据确定平台应力的特征值。

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