Finite Element Analysis to Investigate the Vibration Characteristics of a Delaminated Composite Plate
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Abstract
Composite structures are extensively used in various applications, including aerospace, automotive, and marine industries, due to their favorable mechanical properties, such as high strength-to-weight ratios. However, manufacturing composite structures requires meticulous care, and working conditions must be thoroughly assessed before installation. One significant defect in composite structures is delamination. Finite element analysis (FEA) is among the most powerful computational tools used to investigate such structural defects. This study investigates the effect of delamination on the natural frequencies of carbon-fiber-reinforced polymer (CFRP) composite plates using the commercial finite element analysis (FEA) software ABAQUS. Complementary analytical results were obtained using a Rayleigh–Ritz-based MATLAB code. Different stacking sequences and boundary conditions were considered in both the analytical formulation and finite element analysis. The finite element results were compared with the analytical results to validate the composite plates. The natural frequency of the composite plate decreased as the delamination size increased. Additionally, composite plates clamped on all sides exhibited higher natural frequencies in lower modes for symmetrical laminates compared to other constraints. For cross-ply laminates, simply supported composite plates showed higher natural frequencies. The comparison revealed that the results from both finite element analysis and analytical analysis were in good agreement. The novelty of this work lies in the systematic ABAQUS-based finite element investigation of mid-plane delamination effects across 48 CFRP plate configurations, encompassing four boundary conditions, three delamination areas (6.25%, 25%, and 56.25%), and three stacking sequences, validated against analytical Rayleigh–Ritz solutions. The findings have direct practical significance for structural health monitoring, damage assessment, and design of CFRP components in aerospace and automotive industries.
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