Static Analysis of Sandwich Panels with Nonhomogeneous Soft Cores

摘要

Although engineering sandwich panel theories can usually give accurate displacement, most of them cannot recover all stresses accurately, especially for the sandwich panels with nonhomogeneous soft cores. In this paper, a static analysis of sandwich panels with nonhomogeneous soft cores is performed by using the differential quadrature method. The material properties vary exponentially through the thickness according to a power-law form. To circumvent the difficulty in dealing with the discontinuity of the first-order derivative of material parameters encountered by point discrete methods, a novel modeling strategy is proposed. Only the top half of the core is analyzed, and the displacement and stress of the entire core are obtained by using the method of superposition. Detailed formulations are provided. Numerical results are presented to investigate the effect of the power-law exponent on the displacement and stress of the sandwich panels with nonhomogeneous soft cores. The computed displacement and the through-thickness distributions of the stress are found in good agreement with those obtained by Abaqus software with very fine meshes.