Semi-analytic approach for sandwich plate U-bending considering shear deformation of the core

Abstract

The deformation mechanism of a sandwich plate during U-bending was theoretically investigated by rigid-plastic analysis considering shear deformation of the core and the frictional effect. The deformed shapes of a sandwich plate, which were described as a combination of straight lines and arcs, were calculated by Newton method to minimize the total internal work dissipation. Homogenized properties of core shear stress-shear strain curves calculated by using pure shear FE-analyses were used in the analysis. For the numerical verification of the proposed analysis, U-bending simulations were carried out for sandwich plates with various inner structures including a pyramidal truss core, a honeycomb core, corrugated cores, and a sheared dimple core. The analytic scheme has enabled the acceptable prediction of the load curves and deformed shapes during U-bending. (C) 2012 Elsevier Ltd. All rights reserved.