Damping Properties of Closed-Cell Aluminum Foam Based on PolyMAX Modal Analysis Method

The software Image-Pro Plus was employed to characterize pore-structure of closed-cell aluminum foams, and then the relationship between the modal damping ratio and porosity, nominal pore-size and natural frequency of aluminum foam were investigated using the PolyMAX modal analysis method. Furthermore, the modal assurance criterion was used to verify the independence of experimental results. The results show that each order modal had high independence.The damping ratio increased with the increase of porosity, but inversely proportional to the nominal pore-size. Meanwhile, each order natural frequency of the aluminum foam decreased with the increase of the porosity.