Browsing by Author "Maizia, Abdelhakim"
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- Deterministic analysis for creep behavior of damaged composite tubular structurePublication . Hocine, Abdelkader; Maizia, Abdelhakim; Ghouaoula, Abdelhamid; Ribeiro, J.E.The aim of this paper is to study the effect of creep loading on damaged multilayered composite cylindrical structures, taking into account various damage rates by developing an analytical model. The developed model is used to simulate the elastic-visco-plastic response of damaged cylindrical composite structure under different types of loading such as tension and internal pressure with end effect. This model makes it possible to estimate the service life of the multilayer damaged structures subjected to a creep loading. The results obtained make and show that the presence of the damage within the multilayer structures causes a clear increase of the circumferential stress which is the only responsible of the ruin, where some results are compared with experimental testing from previous works and a good correlation is obtained.
- Failure analysis of biocomposite sandwich pipe under internal pressure – Application for high pressure gas transportation pipelines MEDGAZPublication . Habbar, Ghania; Hocine, Abdelkader; Maizia, Abdelhakim; Bezazi, Abderrezak; Ribeiro, J.E.; Houcine Dhaou, Mohamed; Bouledroua, OmarIn this paper, analytical and 3D numerical models are developed to investigate the mechanical behavior of sandwich pipe under internal pressure loading. The suggested models provide an exact solution for stresses, strains and displacement on the sandwich pipe, which is made of epoxy material for the core layer and reinforced materials with an alternate-ply for the skin layers. The aim of this analysis is to evaluate the potential applications of jute and pineapple leaf fiber (PALF) bio-fibers in order to replace glass synthetic fibers generally employed in sandwich pipes. In this subject, a failure analytical analysis was developed using TSAI-WU criterion. The results of stress, strain and displacement distribution through the thickness are presented for the analytical and numerical models. The comparison between the both models results show a very good agreement. In order to increase the rigidity of a biocomposite sandwich and reduce the gap compared with a synthetic sandwich, a gradual reinforcing of layer numbers was chosen, which permitted the best behavior. The ultimate pressure and safety factors obtained by increasing biocomposite layers are significant for composite transportation pressure pipelines, especially for sandwich pipe based on PALF/epoxy.
- Micromechanical analysis of a bio-sandwich application for cylinder under pressurePublication . Habbar, Ghania; Maizia, Abdelhakim; Hocine, Abdelkader; Ribeiro, J.E.; Dhaou, Mohamed HoucineIn recent years, there has been a growing replacement of synthetic fibers by natural ones, particularly by autochthonous materials. In the case of Algeria, the most abundant plant resources are the PALF (Pineapple leaf fiber), the date palm, and the Alfa fibers. In this work, the development and use of analytical and numerical methods are proposed to predict the mechanical properties of layers based on natural fibers that will be applied to manufacture skins of the sandwich cylinder. To achieve these predictions, four analytical models were used, namely the Halpin–Tsai, the Chamis, the Hashin vs. Rosen, and the ROM. The analytical results were compared with the numerical simulations and experimental data. The prediction of the elastic properties of the three fiber-based eco-composites showed an important dispersion in terms of stiffness.