Damping Behavior of Aluminum Replicated Foam
Damping is an important property of porous materials that defines its application for vibroinsulation. Damping of cast-replicated aluminum alloy AlSi7 (porosity 52–54%) has been investigated. In order to produce the specimen, the technique of vacuum impregnation of a leachable porous loose bed was applied. Damping was measured as the logarithmic decrement of free bending beam vibrations. Damping versus maximum strain amplitude of porous bending beams for various pore sizes has been obtained. As compared to the metal foams of higher porosity (85%), there is no considerable influence of pore size on the damping of replicated aluminum foam of small pore size (<1.6 mm). On the contrary, the damping behavior of replicated aluminum foam with coarse porous structure was like that of a metal foam.
KeywordsReplicated aluminum foam Bending beam Pore size Vibration Vibroinsulation Damping Strain amplitude
The authors would like to acknowledge Composite Materials Ltd. (Kirovgrad, Russia) for the kind assistance in sample production and machining.
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