engleski

Numerical Damage Analysis of Aeronautical Composite Structures Using Multiscale Methods

The research is focused on multiscale methodology application at impact damage modelling of composite structures. Application of multiscale principles on complex composite structures necessitates computationally efficient micromechanical models. Efficient alternatives to FE-based micromechanical models are analytical and semi-analytical micromechanical theories. Consequently, modelling of composite structures has been in this Thesis performed employing the semi-analytical High Fidelity Generalized Method of Cells (HFGMC) micromechanical model. The application of micromechanical models enables modelling of damage processes and physical phenomena which are specfii c to fibre reinforced composite structures. Micromechanical damage initiation and progression theories have been employed in this research as to model composite damage and failure modes at the structural scale. The micromechanical damage initiation and damage propagation models have been validated with available experimental results, whereas results of the multiscale methodology have been compared to available experimental results and to the results obtained employing ply level failure theories. The modi fied Bodner-Partom viscoplasticity theory has been employed in this research as to model the strain rate eff ects of epoxy-based composites at high strain rates. The results of the micromechanical strain rate dependent theory have been compared with available experimental results.

High Fidelity Generalized Method of Cells; composite structures; micromechanics; impact damage; multiscale analysis

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