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Metals 2012, 2(2), 211-218; doi:10.3390/met2020211

Dynamic Behavior of Hybrid APM (Advanced Pore Morphology Foam) and Aluminum Foam Filled Structures

1,* , 2
1 Department for Powder technology, Fraunhofer Institut IFAM, Bremen 28359, Germany 2 Department of Mechanics, Politecnico di Milano, Milano 20156, Italy 3 MUSP Laboratory, Piacenza 29122, Italy
* Author to whom correspondence should be addressed.
Received: 3 May 2012 / Revised: 29 May 2012 / Accepted: 11 June 2012 / Published: 20 June 2012
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The aim of this work is to evaluate the effect of different densities of hybrid aluminum polymer foam on the frequency behavior of a foam filled steel structure with different ratios between steel and foam masses. The foam filled structure is composed of three steel tubes with a welded flange at both ends bolted together to form a portal grounded by its free ends. Structure, internal and ground constraints have been designed and manufactured in order to minimize nonlinear effects and to guarantee optimal constraint conditions. Mode shapes and frequencies were verified with finite elements models (FEM) to be in the range of experimental modal analysis, considering the frequency measurement range limits for instrumented hammer and accelerometer. Selected modes have been identified with suitable modal parameters extraction techniques. Each structure has been tested before and after filling, in order to compute the percentage variation of modal parameters. Two different densities of hybrid aluminum polymer foam have been tested and compared with structures filled with aluminum foams produced using the powder compact melting technique. All the foam fillings were able to suppress high frequency membrane modes which results in a reduction of environmental noise and an increase in performance of the components. Low frequency modes show an increase in damping ratio only when small thickness steel frames are filled with either Hybrid APM or Alulight foam.
Keywords: damping; hybrid foam; APM; Alulight; foam filled tube damping; hybrid foam; APM; Alulight; foam filled tube
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Baumeister, J.; Monno, M.; Goletti, M.; Mussi, V.; Weise, J. Dynamic Behavior of Hybrid APM (Advanced Pore Morphology Foam) and Aluminum Foam Filled Structures. Metals 2012, 2, 211-218.

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