Abstract
This thesis investigates the free edge effect in multi-layered composites, where stress concentrations at dissimilar interfaces induce delamination. A novel 3D Finite Fracture Mechanics (FFM) criterion is introduced to predict delamination under quasi-static, thermal, and fatigue loading conditions. Semi-analytical frameworks are developed to calculate interlaminar stresses and energy release rates (ERR) along semi-elliptical cracks using advanced parametric Finite Element models. These frameworks are extended to hybrid metal/composite laminates, improving fracture predictions. The criterion is validated against experimental tests, offering accurate predictions of failure loads and crack extension in symmetric laminates subjected to various loading scenarios.Thesis is embargoed until 31 December 2025.
| Date of Award | Dec 2024 |
|---|---|
| Original language | English |
| Awarding Institution |
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| Sponsors | UK Research and Innovation |
| Supervisor | Zahur Ullah (Supervisor), Tommaso Scalici (Supervisor), Zafer Kazancı (Supervisor) & Giuseppe Catalanotti (Supervisor) |
Keywords
- Finite fracture mechanics
- free edge delamination
- semi-elliptical crack