Abstract
Metal foams are innovative porous material used for wide range of application such as deformation energy or sound absorption, filter material, or microbiological incubation carrier. To predict mechanical properties of the metal foam is necessary to precisely describe elasto–plastic properties of the foam on cell–wall level. Indentation with low load is suitable tool for this purpose. In this paper custom designed instrumented microindentation device was used for measurement of cell-wall characteristics of two different aluminium foams (ALPORAS and ALCORAS). To demonstrate the possibility of automated statistical estimation of measured characteristics the device had been enhanced by semi-automatic indent positioning and evaluation procedures based on user-defined grid. Vickers hardness was measured on two samples made from ALPORAS aluminium foam and one sample from ALCORAS aluminium foam. Average Vickers hardness of ALPORAS foam was 24.465HV1.019 and average Vickers hardness of ALCORAS was 36.585HV1.019.
Highlights
Metal foams are biomimetic porous materials with cellular inner structure that find wide range of applications from deformation energy absorption to noise attenuation, where their very high specific stiffness greatly improves overall effectiveness of constructions [1, 2]
Elasto-plastic material properties of two types of aluminium foam was measured by Vickers hardness
Due to foam nature of specimens the under surface area can be formed by cavity which is not visible on the surface and some indents were deformed and these Vickers hardness values are omitted from the data set
Summary
Metal foams are biomimetic porous materials with cellular inner structure that find wide range of applications from deformation energy absorption to noise attenuation, where their very high specific stiffness greatly improves overall effectiveness of constructions [1, 2]. Homogenization approach has been proposed as a method for prediction of their mechanical properties on both cell-wall level and at macroscale [3,4,5,6]. For calculation of macroscopic (effective) mechanical properties by homogenization, mechanical characteristics at the lower level of the foam’s hierarchical microstructure (i.e. cell-wall level) have to be assessed with high precision and reliability. Microindentation is a suitable tool for assessment of required elasto-plastic material properties (for cellwall thicknesses from few hundreds of microns) with the possibility for extension to statistical estimation when automated indents’ positioning and evaluation procedures are introduced
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