Analisi di compositi laminati a fibra curva tramite ABAQUS = Analysis of curved fibre laminated composites using ABAQUS

This thesis investigates the mechanical characterization of Variable Stiffness Composites, also known as Variable Angle Tow (VAT) composites. These materials are gaining prominence in the aerospace industry due to their superior mechanical properties compared to traditional metallic alloys. Unlike conventional composites, VAT composites allow for the continuous variation of fiber orientation within the laminate, which enhances structural performances by optimizing the distribution of stiffness and strength. However, this adds complexity also makes their modeling and analysis more challenging. The research presented in this thesis addresses the complexity of analyzing VAT composites using finite element methods (FEM). The study uses the commercial software ABAQUS, combined with Python scripting, to simulate and solve structural problems in a synergistic manner. Python scripting plays a key role in the parameterization of the models, enabling efficient automation and customization of the geometry. This integrated approach provides flexibility in exploring a wide range of fiber configurations, boundary conditions, and loading scenarios. The mechanical behavior of VAT laminates is examined through both 2D and 3D models, focusing on static, dynamic, and buckling responses. The methodology involves characterizing different fiber paths, from straight to curved configurations, and evaluating their impact on structural performance under various load conditions. Through simulations, this work evaluates the stress distribution, displacement, and deformation patterns in VAT laminates. Specifically, a 2D finite element model is used for static analysis, evaluation of natural frequencies, and buckling behaviour, providing effective means of assessing the overall mechanical response of VAT laminates. For a more detailed study of stress distributions, a 3D model is implemented, enabling a precise evaluation of local stresses and deformations within the layers. This dual approach ensures a comprehensive understanding of the material's performance across different scales. Comparisons are made between traditional straight fiber composites and VAT composites to highlight the benefits of using VAT technology, particularly in aerospace applications where weight optimization and mechanical efficiency are critical. The numerical results show that VAT composites provide improved resistance to mechanical loads, reduce stress concentrations, and enhance buckling resistance, making them a promising solution for high-performance aerospace structures. This research develops an accurate and computationally efficient parameterised finite element analysis framework that uses both two- and three-dimensional models to investigate the mechanical behaviour of VAT.