DOI: https://doi.org/10.1590/1980-5373-MR-2022-0302 Materials Research. 2023; 26:e20220302 Effect of the Fibers Orientation of the Different Types of Composite Plates Notched of U-Shape Repaired by Composite Patch Berrahou Mohamed a,b * , Amari Khaoula c , Belkaddour Leila a a Université de Relizane, Faculty of Technology, Laboratory of Industrial Engineering & Sustainable Development (GIDD), CitéBourmadia, 48000, W. Relizane, Algeria. b University of Sidi Bel Abbès, Laboratory of Mechanics, Physics of Materials (LMPM), Cité Ben M’hidi, BP 89, 22000, Sidi Bel Abbes, Algeria. c University of Science and Technology (USTO), Laboratory of Aeronautical and Propulsion Systems (LAPS), 31000, Oran, Algeria. Received: July 01, 2022; Revised: September 24, 2022; Accepted: November 05, 2022 The main objective of this work is to repair a structure of composite materials by gluing composite patches with different fiber directions. The effects of stress distribution, damaged area ratio, stress intensity factor KIC and imposed stacking sequence were highlighted by a comprehensive study that contained two sides, an applied experimental side and a numerical model side. The composite materials plates studied in this work are 8-layer of graphite/epoxy, glass/epoxy and boron/epoxy, with different angles. The results obtained clearly show with respect to the experimental side that the orientation of the fibers affects the ultimate strength of failure and that the fibers oriented longitudinally in the direction of the tensile strength give us an ideal performance of the composite material. As for the model aspect of this study, the effects of stress intensity factor and the relationship between the damaged area and the fiber orientation on the performance of these patches were studied. We can conclude from this study that the orientation of the fibers has an important role in the performance of the composite material and its efficiency in repair. Keywords: Composite, ultimate strength σ u , Stress intensity factor (SIF), the damaged area ratio (D R ), Von Mises Stress, laminate; Stacking sequence. 1. Introduction In recent times the use of composite materials has become increasingly important in modern advanced industries. Due to its remarkable advantages in terms of lightness, hardness, corrosion resistance, and dealing with moisture and various weathers efficiently, as well as the price and durability and in terms of being easily formed but also in terms of dynamic, electrical or thermal. This type is currently replacing metallic materials in many industries (aviation, marine, civil engineering, sports and health uses, etc.) 1-3 . In order to develop and improve parts for various uses, it is necessary to understand and analyze the long-term properties of composite materials (durability). Another advantage of these materials is their ability to dissipate energy, which makes them less brittle than their conventional counterparts 4-6 . One of the most important factors affecting the performance of composite materials for their duty is Humidity, an experimental study of water effect was conducted on the mechanical and dynamic properties of composite materials to analyze the effect of water absorption and fiber direction by Khouloud et al. 7 . Mokhtari et al. 8 identified all the stresses present in the adhesive joint in order to improve the nature of the material, as well as the nature and orientation of the fibers 8 . Among the factors affecting the behavior and performance of the composite material is the heat factor. Mechab et al. examined the deterioration of composite panels under convection in order to evaluate the effects of the mechanical properties of the composite on the orientation angle of the panel fibers and to prove the effect on the values of j integral 9 . The researcher Berrahou Mohamed has done several works regarding the study of the behavior of corroded aluminum plates under thermal stresses 10 , these Studies show that the higher the temperature, the more the composite material is affected negatively which in some cases may lead to significant damage. The main objective of this study was to analyze the effect of fiber orientation on the performance of the composite material. We conducted a Library search on the most important studies that dealt with this phenomenon in particular, and among these studies. An experimental study by Ngoc -Hung Vu et al. on the mechanical behavior of a fiber-reinforced multilayer composite plate in order to study the assembly of a composite plate 11 . In addition, Long Pham et al. 12 examined the effect of steel fiber length and fragmentation size on the mechanical properties of plates 12 . The analytical results of a study by Doo-YeolYoo and NemkumarBanthia showed that the assumption of 2-D fiber random orientation is suitable for unreinforced UHPFRC beam, while 3-D random fiber orientation assumption is suitable to reinforce with steel, UHPFRC beams and GFRP rebar due to fiber alignment disturbance from internal reinforcements 13 . *e-mail: [email protected]
Effect of the Fibers Orientation of the Different Types of Composite Plates Notched of U-Shape Repaired by Composite Patch
Jul 01, 2023
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