Abstract
Closed cell, high strength metallic foams, like ceramic hollow spheres filled metal matrix foams are promising materials to build lightweight but high specific strength structural parts. The aim of this study is to investigate the damage of the foam structure during monotone or cyclic compression. The tested metal matrix syntactic foams were produced by inert gas pressure infiltration. Four different alloys as matrix and two different ceramic hollow spheres as filler material were applied. The cylindrical specimens were investigated in quasi-static and high strain rate compression and in cyclic compression. The higher strain rates were ensured by a Split-Hopkinson pressure bar system, while the fatigue tests were performed on a closed loop universal hydraulic testing machine. The failure modes of the foams have explicit differences showing barreling and shearing in the case of quasi-static and high strain rate compression respectively. In the case of the fatigue loading, there was a significant difference between the damage mechanisms of the unalloyed and the Si alloyed matrix syntactic foams. This can be explained by the difference between the yield strength of the matrix material and the ceramics hollow spheres.
Highlights
Metal matrix syntactic foams (MMSFs) can be applied in numerous fields because of their damping effect, low density and high specific strength: parts of aircrafts and vehicles, packing materials, covering or extender of sandwich structures
The aim of this paper is to widen the information about the structural damages in metal matrix foams during monotone and cyclic compression
The quasi-static and high strain rate monotone compression caused damage mechanism was very similar in the case of the different matrix materials (AlSi12 (O), AlCu5 (O), AlCu5 (T6), AlMgSi1 (O) and AlMgSi1 (T6))
Summary
Metal matrix syntactic foams (MMSFs) can be applied in numerous fields because of their damping effect, low density and high specific strength: parts of aircrafts and vehicles, packing materials, covering or extender of sandwich structures. These materials have high specific compression strength and absorbs high amount of mechanical energy during the compression they can be applied in automotive industry as buffer zones materials. The most common filler materials are the ceramic [10,11,12,13,14,15] or metallic [10] hollow spheres but in order to reduce the costs of the MMSFs perlite [16,17,18] or pumice [19] are used as well. Szalóki et al has investigated the cutting processes of similar material as described in [27]
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