Abstract
The paper investigates the post-buckling response of web-core sandwich plates through classical continuum mechanics assumptions. The compressive loading is assumed to be in the direction of the web plates. Equivalent Single Layer (ESL) plate formulation is used with the kinematics of the First order Shear Deformation Theory (FSDT). During the initial, membrane-dominated loading stages, it is observed that the effect of finite size of the periodic microstructure is barely influences the plate responses. At the higher loads, when bending is activated, the finite size of the microstructure activates secondary shear-induced bending moments at the unit cells of the plate. A method to capture the envelope of the maximum values of these bending moments is presented. The findings are validated with the shell element models of the actual 3D-geometry. Finally, the physical limits of the classical continuum mechanics are discussed in the present context.
Highlights
There is constant need to study new materials and structural configurations for thin-walled structures
The objective of this study is to present the phenomena related to post-buckling response of web-core sandwich plates and thereby extending the work presented in Ref. [39]
The load-end-shortening, load–deflection and loadout of plane shear behavior is presented in Fig. 5, where the comparison of the First order Shear Deformation Theory (FSDT)-Equivalent Single Layer (ESL) with respect to full 3D-FE model is presented
Summary
There is constant need to study new materials and structural configurations for thin-walled structures. Weight reduction and strength increase enable lighter and often more sustainable structural solutions that can be used in civil, naval and aeronautical applications. Structural efficiency in terms of strength-toweight and stiffness-to-weight is obtained by positioning of the material according to the load-carrying mechanism of the structure. This often results in plates with periodic microstructure, for example, single-sided stiffened plates and sandwich panels with visibly discrete core; see Fig. 1. The periodic structure allows integration of functions to the panel(e.g. air-conditioning and cable tracks). Unidirectional stiffening system with coarse spacing becomes attractive structural alternative; Refs. These unidirectional plates, especially in the form of steel sandwich plates, have been found to have excellent mechanical properties for Meccanica (2021) 56:1287–1302
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