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.
| Date of Award | Dec 2024 |
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| Original language | English |
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| Awarding Institution | - Queen's University Belfast
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| Sponsors | UK Research and Innovation |
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| Supervisor | Zahur Ullah (Supervisor), Tommaso Scalici (Supervisor), Zafer Kazancı (Supervisor) & Giuseppe Catalanotti (Supervisor) |
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- Finite fracture mechanics
- free edge delamination
- semi-elliptical crack
Application of finite fracture mechanics for predicting free edge delamination in multi-layered materials under various loading conditions
Burhan, M. (Author). Dec 2024
Student thesis: Doctoral Thesis › Doctor of Philosophy