Abstract
In this study, the elastic-viscoplastic properties of aluminum honeycomb sandwich panels are investigated using a homogenization theory. For this, the mathematical homogenization theory is reconstructed for elastic-viscoplastic analysis of honeycomb sandwich panels by introducing traction free and uniform deformation boundary conditions. Moreover, the domain of analysis is reduced to a quarter using point-symmetry of internal structures of honeycomb sandwich panels. The present method is then applied to the analysis of macroscopic elastic-viscoplastic behavior and microscopic stress distribution of an aluminum honeycomb sandwich panel subjected to in-plane uniaxial compression or out-of-plane pure shear. It is shown that for the in-plane uniaxial compression, the stress concentration arises at face/core interfaces, especially at intersections of core walls. On the other hand, for the out-of-plane pure shear, the stress concentration arises at intersections of core walls away from face/core interfaces.
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