Browsing by Author "Zitoune, R."

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Compressive behaviour of concrete elements confined with GFRP-prefabricated bonded shells
(Taylor and Francis, 2015) Beddiar, A.; Zitoune, R.; Collombet, F.; Grunevald, Y.H.; Abadlia, Mohamed Tahar; Bourahla, N.
Sandwich composites impact and indentation behaviour study
(Elsevier, 2013) Hachemane, B.; Zitoune, R.; Bezzazi, B.; Bouvet, C.
In order to better exploit the natural cork available in Algeria, an experimental characterisation of a jute/epoxy–cork sandwich material to impact and indentation was undertaken. The aim of this work is to evaluate the impact energy and cork density influence over the sandwich plate damage behaviours by instrumented static and dynamic tests. The results show that the onset damage force, the maximum force and the damage size are influenced by the cork density and the impact energy. The sandwich material, with the heavy agglomerated cork having a density of 310 kg/m3 is characterised by a weaker energy dissipation capacity, by about 3.72% for impact test and 3.29% for indentation one, than the sandwich with lighter cork (160 kg/m3). This difference is an infusion process consequence. The infiltrated resin into the agglomerated cork pores changes the material local rigidity. Also, under impact loading the sandwich laminates dissipate 11% more energy than with the quasi-static indentation test
Static and dynamic behaviours of composite laminate
(Nova Science Publishers, 2012) Zitoune, R.; Mir, A.; Hachemane, B.; Boyer, F.; Bouvet, C.; Collombet, F.; Bezzazi, B.
Study of mechanical and hygrothermal properties of agglomerated cork
(2012) Mir, A.; Bezzazi, B.; Zitoune, R.; Collombet, F.
The mode of development of sandwich panels with cork core by the method infusion cannot prevent the resin from penetrating inside cork. This study characterizes white cork agglomerated before and after the development of sandwich panels to see the influence of the resin on the mechanical and hygrothermic characteristics of cork. Two types of cork are considered, they are characterized by their density of 270 kg/m3 (C270) and of 190 kg/m3 (C190). One notes that the modulus of rigidity of C270 cork is 20% larger than that of C190.The presence of resin increases also the module of shearing 47% for C270, 64% for C190. The hygrothermic analysis out of drying oven at 100°C shows a fall of significant mass in the first 7 hours. The analysis thermogravimetry at 220°C, the fall of significant mass is recorded in the first 5 minutes
Study of mechanical and thermomechanical properties of jute/epoxy composite laminate
(2010) Mir, A.; Zitoune, R.; Collombet, F.; Bezzazi, B.
This article presents the development and the characterization of composite material (laminate) containing natural jute fiber reinforcement. Thermal characterization of jute fiber reinforcement shows the influence of the temperature on the mechanical behavior of fiber. At 180 C the jute fabric loses 50% of its mechanical characteristics. The laminate obtained by a process known as infusion is polymerized at a temperature lower than that which affects the mechanical properties of dry fabric. The digital image correlation carried out on laminated jute/epoxy (warp and weft direction) under tensile test shows the presence of a considerable gradient of deformation. This gradient is explained by the variability related to the local voluminal change of jute fibers of one place to the other and the nature of the weaving of the jute fiber. The three-point bending tests show a significant dispersion of rupture stress. The thermomechanical tests carried out on samples in the two principal directions, show that the thermal coefficient of expansion in warp direction is 48% larger compared to the weft direction. The thermogravimetric test shows that this laminate absorbs up to 4% water mass after 8 h in a climatic chamber with 70% moisture content