Finite Element Modelling and Dynamic Behavior Analysis of Sandwich Panel with Cutout

This work investigates the buckling behavior of the sandwich flat panel structure with a cutout under the influence of externally applied mechanical load. The investigation was carried out using the concept of First-order Shear Deformation Theory (FSDT) and Finite Element Method (FEM) in a commercially available modelling and analysis tool ABAQUS. The FSDT is known to be a precise theory for analyzing the structural behavior of sandwich panels and FE is a widely accepted approximate method to solve the differential/integral governing equations. Initially, the sandwich panel with cutout is modeled and material properties of core and face sheets are being defined from the material library/user defined tabs. The model is now discretized using an 8-noded isoparametric element, each offering 48 degrees of freedom. Later on, the specific external mechanical load, as well as the edge constraint condition, are being imposed. Now, the model is being solved to determine the critical buckling load. First of all, the accuracy of above discussed numerical model has been confirmed before its further implementation by comparing the numerically obtained results with the published critical buckling responses, demonstrating a favorable concurrence with the current simulation model. Furthermore, the numerical model has been used to examine the geometrical parameters like shape, size, and position of cutout along with core-face thickness ratio and end conditions effect on buckling responses of sandwich panels by solving various examples. Now, a comprehensive analysis and discussions are made on the outcomes/trends of the solved examples in detail.