Effect of using carbon/kevlar hybrid fabric on post-buckling performance of fiber reinforced aerospace structures

Date

2025-8

Author

Ongun, Şevval

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Buckling is defined as the sudden instability or failure of a structural element under compressive loading, typically resulting in deformation characterized by bending or lateral displacement. With advancements in materials science, increasing focus has been placed on investigating the buckling and post-buckling behavior of composite structures, particularly in aerospace applications. This study aims to examine the post-buckling response of a conical structure fabricated from carbon-aramid twill composite material. Initially, the mechanical properties of flat plates composed of carbon and carbon-aramid composites were determined through both experimental testing and analytical modeling. The structure was micro-modeled using the Representative Volume Element (RVE) method, and the resulting mechanical properties were validated against experimental data. The flat plates were subsequently subjected to compressive and torsional loading to evaluate their buckling and post-buckling performance. Nonlinear analyses, incorporating buckling behavior over time, were performed and validated through experimental results. Following the validation of the analysis methodology for both carbon and hybrid flat plates, the same approach was applied to the conical structure. The post-buckling behavior of conical structures composed of carbon twill and hybrid carbon-aramid twill materials was then investigated through a comparative study.

Subject Keywords

Composite materials, Buckling, Twill hybrid fibers, Finite element method, Micro-modelling

URI

https://hdl.handle.net/11511/116064

Collections

Graduate School of Natural and Applied Sciences, Thesis