Experimental characterization and multi-scale modeling of two-dimensional woven composites

Date

2025-1

Author

Diyarbakır, Nusret Cem

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The main aim of this thesis is to predict elastic mechanical properties of woven composites by different computational approaches. To achieve this aim, the effect of different curing routes on the mechanical properties are studied experimentally and computationally. Micromechanical modeling of composites is executed within a multi-scale framework. Autoclave and out-of-autoclave (vacuum-oven) are utilized for curing experiments to observe the differences in microstructure and hence, macro properties. The microstructures are examined using optical microscopy, scanning electron microscopy, and micro X-Ray tomography. Macromechnical properties are determined using tensile and three point bending tests. Moreover, the differences in microstructure are implemented in computational models and their effect on elastic properties are evaluated. For the simulations, mean field homogenization (MFH) with Mori-Tanaka scheme and finite element homogenization are employed. Accuracy and efficiency of these simulation work are compared with experimental data for validation. Lastly, for the finite element homogenization, mesh type and convergence studies are conducted.

Subject Keywords

Micromechanical modeling, Woven composites, Mean field homogenization, Finite element homogenization, Mechanical properties

URI

https://hdl.handle.net/11511/113781

Collections

Graduate School of Natural and Applied Sciences, Thesis