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Metal Foams (metal + foam)

Distribution by Scientific Domains

Polymers and Materials Science	75%

Selected Abstracts

Machine Tools With Metal Foams,

ADVANCED ENGINEERING MATERIALS, Issue 9 2006
R. Neugebauer
Abstract Machine tool construction calls for subassemblies with reduced weight while retaining excellent dynamic properties. Modern frame components do always meet required static stiffness but often display oscillation problems due to low component wall thicknesses. Breaking down solid steel structure into wide-area sandwich designs such as steel-aluminum foam-steel panels results in good static properties to be combined with excellent properties since these sandwiches have 30 to 40 times the flexural strength. This is due to their major geometrical moment of inertia in relation to adequate-mass steel sheet metals. In addition, the foam core dampens oscillations. Studies on foamed steel sections indicate that 2 to 3 times higher damping is likely in relation to unfoamed steel sections. These benefits were the motivation for the Chemnitz Metal Foam Center to accelerate development of extremely large-format sandwiches with dimensions of 1,500,×,1,000,mm2. [source]

Thermal and Electrical Conductivity Measurements on Aluminum Foams

MATERIALWISSENSCHAFT UND WERKSTOFFTECHNIK, Issue 4 2003
N. Babcsán
Abstract Metal foams are one of the most interesting types of materials although there is limited information concerning their thermal and electrical conductivity. Closed cell different density Alporas foams are investigated, which has one of the most homogeneous cell size distribution recently. Comparative method has been chosen to determine the thermal conductivity of the samples in the function of the temperature at 30, 100, 200, 300, 400, 500,°C. For measuring the electrical conductivity of aluminium foams a special low frequency eddy current measuring apparatus was used. The ratio of thermal and electrical conductivity was calculated and shown an increasing function by the density of the foams. [source]

Analytical Modelling of the Radiative Properties of Metallic Foams: Contribution of X-Ray Tomography

ADVANCED ENGINEERING MATERIALS, Issue 4 2008
M. Loretz
Two metallic foams exhibiting a similar porosity but different cell sizes have been characterized using X-ray tomography. The images have been processed and analysed to retrieve the morphological properties required for the calculation of the radiative properties such as the extinction coefficient. The multiple possibilities of using the X-ray tomography method rather than conventional optical methods like SEM have been quantified. The extinction coefficient has then been determined from two approaches. First, the resulting morphological properties have been used as the input data of the conventional independent scattering theory. A special emphasis is put on the determination of morphological properties and their influence on the results. In the second approach, an original method is also proposed in order to determine the extinction coefficient of highly porous open cell metal foams, from the tomographic images and without any calculation or hypothesis. Results show a good agreement with the extinction coefficient obtained from experimental measurements. Our novel method enables to reduce uncertainties considerably. [source]

A numerical homogenisation strategy for micromorphic continua

PROCEEDINGS IN APPLIED MATHEMATICS & MECHANICS, Issue 1 2009
Ralf Jänicke
In this contribution, we apply a numerical homogenisation scheme for micromorphic continua replacing constitutive equations on the macroscale by a microscopic boundary value problem. The aim of this procedure is to describe the influence of the microtopology on the effective behaviour of microstructured materials such as biological tissues as well as polymer or metal foams. On the one hand, that allows for avoiding the numerically expensive calculation of a fully resolved microstructure. On the other hand there is no need to identify additional material parameters which are in general hard to interpret from the physical point of view. (© 2009 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]