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Experimental analysis of Mechanical behavior in bending of composites sandwich structures Aluminum-Aramid Fibers.
Last modified: 2018-08-01
Abstract
Experimental analysis of Mechanical behavior in bending of composites sandwich structures Aluminum-Aramid Fibers.
Ahcene OUBOUZID1*1, Boualem KESKES22
1ahcene050790@gmail.com
2b_keskes@yahoo.fr
*Corresponding author: Ahcene Oubouzid.
ABSTRACT
Composite sandwich structures are a very good compromise between lightness, strength and rigidity. The mechanical performance of composite sandwich material depends on the mechanical properties of skins [1], those of the core [2], as well as the connection between the skins and the core. Today, sandwich structures are common in the aerospace, shipbuilding, railroad, civil engineering and many other industrial sectors. Several studies have been carried out on the use of Aramid Fiber [3] as a material constituting the core and continue on this material in order to control the bending behavior in specific environments and structural applications, the mechanical properties of composite sandwich structures can be severely impaired. Therefore, given the long-term use of sandwich materials as structural elements, research on bending behavior is of paramount importance. it is therefore imperative to know the behavior of these structures by bending, as well as the influence of the various defects (indentation, delamination, artificial notches) on the damage and the degradation of the materials sandwich structures [4]. The objective of this work is to study the mechanical behavior in 3-point bending in static and the damage of honeycomb composite sandwich structures. The purpose of the study is to determine: the essential mechanical characteristics (stiffness in bending, in shear, maximum stress in bending, the deformation arrow, etc.), the effect of the orientation of the cells of the core, the effect of the distance between support and the effect of the density of the core and reveal the different modes of damage resulting in the total degradation of the sandwich. Experimental tests in three-point bending were carried out on specimens for the different distances between supports (100,120, .. ..400 mm) and density of the core (48, 80, 128 and 144 Kg / m3) and by varying the configuration of the cells of the core (L, W). The analysis of all the results showed that the sandwich composite Aluminum - Aramid fibers behaves like fragile materials. Microscopic observations of the tested specimens showed that the damage resulted in buckling followed by shearing of the walls of the sandwich cells, and a localized indentation in the level of the load application for all the distances between supports and for the L and W configurations of the sandwich core.
References
[1] Jack R. Vinson, (2005). "Sandwich structure: Past, Present, and Future" (2005).Advancing with sandwich structures and materials, Proceeding of the 7th International conference on sandwich structures, Aalborg University, Danemark.
[2] BERTHELOT, J.-M. (1999). Composite Materials. Mechanical Behaviour and Structural Analysis, SPRINGER-VERLAG, New York, Paris.
[3] Allen G "Analysis and design of Structural Sandwich Panel" (1969). Pergamon Press Oxford.
[4] Boualem Keskes, A. Abbadi, Z. Azari, J.Gilgert and N. Bouaouadja (2007) "A FATIGUE CHARACTERIZATION OF HONEYCOMB SANDWICH PANELS WITH A DEFECT" Materials and technology 41 (2007) 4, 157161 157 ( ISSN 1580-294).