Investigation on Effect of Non-Linearity in Buckling and Post-Buckling of Fiber Laminated Shells

Investigation on Effect of Non-Linearity in Buckling and Post-Buckling of Fiber Laminated Shells

Miss. Gauri Dilip Kohale, Prof. V. M. Sapate

1Student, Department of Civil, G H Raisoni University, Anjangaon Bari Road, Amravati Maharashtra, India, Southern Asia

2Assistant Professor, Department of Civil, G H Raisoni University, Anjangaon Bari Road, Amravati Maharashtra, India, Southern Asia

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Abstract - This research paper investigates the impact of non-linearity on the buckling and post-buckling behaviour of fibre-reinforced laminated shells, which are extensively utilized in aerospace, marine, and automotive applications due to their superior strength-to-weight ratio and tailored anisotropic properties. The study addresses the intricate effects of geometric non-linearities and material anisotropy, crucial factors influencing the stability and load-bearing capacity of these advanced composite structures. A comprehensive finite element analysis (FEA) framework is developed, incorporating both geometric and material non-linearities to accurately simulate the buckling and post-buckling response of laminated shells. Various parameters, including fibre orientation, stacking sequence, and boundary conditions, are systematically varied to assess their influence on the structural performance. The findings reveal that non-linearity significantly affects the buckling loads and post-buckling behaviour of laminated shells. Non-linear analyses predict lower buckling loads compared to linear models, underscoring the necessity of incorporating non-linear effects in design methodologies. Additionally, post-buckling analysis uncovers complex deformation mechanisms and stress redistribution phenomena, demonstrating the enhanced load-carrying capacity and resilience of the structures beyond initial buckling.

This investigation provides critical insights into the design and optimization of fibre-reinforced laminated shells, offering practical guidelines for improving their structural efficiency and reliability. The results contribute to the advancement of predictive modelling techniques and the development of high-performance composite materials, fostering innovation in engineering applications where lightweight and robust structures are paramount.

Key Words:  Non-linearity, Buckling, Post-buckling, Geometric non-linearities, Material anisotropy, Finite element analysis (FEA), Structural stability, Composite materials, Aerospace structures, Marine structures, Automotive applications, Load-bearing capacity, Fiber orientation, Stacking sequence, Deformation mechanisms, Stress redistribution, Predictive modelling, Structural efficiency