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Advances in Aircraft and Spacecraft Science Volume 11, Number 3, September 2024 , pages 215-230 DOI: https://doi.org/10.12989/aas.2024.11.3.215 |
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Assessing composite patch repair efficiency in thick and high elastic modulus structures |
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Mohammed Baghdadi
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| Abstract | ||
| The effectiveness of structural repair using composite patches depends on both geometric and mechanical parameters, including the properties of the patch, the adhesive joint, and the repaired structure. In this study, the finite element method (FEM) was employed to investigate the influence of repaired structure parameters effect, specifically thickness and Young's modulus, on the repair efficiency. Unlike previous studies, which focus on aerospace applications, this work explores the potential to extend composite patch repair techniques to other domains such as hydrocarbon, marine, and civil engineering, where structures are characterized by higher Young's modulus and thicknesses. The analysis examines the stress intensity factor (SIF) at crack tips on both the repaired and unrepaired faces, as well as shear stresses within the adhesive layer. The results reveal that while single-patch repairs are effective for thinner structures (e.g., aircraft fuselages under 4 mm), double-patch repairs are necessary for thicker structures, such as those in hydrocarbon or marine engineering, to stabilize cracks on both faces. Furthermore, using a thinner double patch repair provides similar SIF reductions as a thicker patch, offering significant mass savings—a critical factor in engineering design. These findings highlight the adaptability of composite repair techniques across various industries, demonstrating the potential for broader application beyond aerospace, with implications for enhanced structural integrity and reduced weight. | ||
| Key Words | ||
| adhesive; crack; patch composite; shear stress; SIF; stiffness; thickness | ||
| Address | ||
| Mohammed Baghdadi: LMPM, Department of Mechanical Engineering, University of Sidi Bel Abbes, BP 89, Cité Ben M'hidi, 22000 Sidi Bel Abbes, Algeria | ||
