Characterization of spherical cell porous aluminum alloy-polyurethane interpenetrating phase composites at different temperatures

Abstract

The characterization, including deformation process, damping mechanisms within the plastic plateau region, damping and stiffness properties, of spherical cell porous aluminum alloy-polyurethane interpenetrating phase composites (SCPAA/PU composites) at different temperatures were investigated. Compressive tests show that seven distinct regions for the composites under the given loading pattern are exhibited. Then, the damping mechanisms for the composites within the plastic plateau region are found to be attributed to the following aspects, including the damping of the matrix and filler phase, the interfacial friction damping between the matrix phase and filler phase, and the macroscopic interface dislocation friction damping along macro-interface in the debonded region. Furthermore, no clear regularity between the loss factor and temperature is observed, while the secant stiffness decreases with the increment of temperature. Both loss factor and secant stiffness declines rapidly in the first few cycles, and reduces slowly until a stable state is achieved. At last, the variation of loss factor/secant stiffness with the number of cycles can be described by a power function model. The proposed model works well with the testing data.