Modeling of Structural Sandwich Plates with `Through-the-Thickness' Inserts: Five-Layer Theory
Song-Jeng Huang; and Lin-Wei Chiu

Source CMES: Computer Modeling in Engineering & Sciences, Vol. 34, No. 1, pp. 1-32, 2008
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Keywords sandwich, through-the-thickness insert, adhesive joints, elastic properties, multi-segment integration method.
Abstract The composite sandwich plate is one of the most common composite structures. Local stress concentrations can be caused by localized bending effects where a load is introduced. Although a sandwich structure with an insert is one of the classical load bearing structures, little work has been conducted on the adhesive layers or inserts. This study involves a linear elasticity analysis of five-layer sandwich plates with ``through-the-thickness'' inserts, using sandwich plate theory to analyze deformation behavior. Governing equations are formulated as partial differential equations, which are solved numerically using the multi-segment integration method. Sandwich plates with ``through-the-thickness'' inserts subjected to axisymmetric external loading are considered as examples. Stress concentrations closest to the intersection between the potting material, core and adhesive layer are likely to fail, as observed. A comparison with degraded three-layer theory and Thomsen's theory [Thomsen and Rits (1998)] confirmed the accuracy of the proposed five-layer theory. The finite element method results in this study were obtained using the ABAQUS software and compared with analytical results. The validity of the analytical solution (five-layer theory) was also demonstrated.
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