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Advances in Aircraft and Spacecraft Science Volume 13, Number 1, March 2026 , pages 093-114 DOI: https://doi.org/10.12989/aas.2026.13.1.093 |
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Porosity induced variations in the mechanical response and stress evolution of Al-12Si/Al2O3 composite under thermomechanical loads |
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Billel Boukert, Mohamed Khodjet Kesba, A. Benkhedda and E.A. Adda bedia
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| Abstract | ||
| This study investigates the thermo-mechanical behavior of cracked and porous Al-12Si/Al2O3 metalceramic composites under varying thermal and mechanical conditions. A predicted model is developed to analyze stress distribution, Young's modulus, and Poisson's ratio while incorporating the effects of porosity and ceramic content. The results reveal that higher porosity weakens stress transfer and reduces stiffness, while increased ceramic content enhances rigidity but also intensifies stress localization. Young' s modulus decreases significantly with temperature and porosity. Poisson's ratio decreases with rising temperature, confirming reduced lateral deformation resistance in more porous structures. The proposed model is validated against the Equivalent Constraint Model (ECM), showing strong agreement in stiffness degradation trends. This study extends previous research by integrating Knudsen's model into stress distribution analysis, providing a novel approach to quantify porosity effects in thermo-mechanical behavior. The findings contribute to optimizing metal-ceramic composites for hightemperature applications in aerospace and automotive industries, ensuring enhanced thermal and mechanical stability. | ||
| Key Words | ||
| meta/ceramic; porosity; stress distribution; thermal stress; young's modulus | ||
| Address | ||
| Billel Boukert, Mohamed Khodjet Kesba, A. Benkhedda: Aeronautical Sciences Laboratory, Institute of Aeronautics and Space Studies, University of Blida 1, BP 270 Route de Soumaa, Blida 09000, Algeria E.A. Adda bedia: Materials and Hydrology Laboratory, University of Sidi Bel Abbes, Algeria | ||
