Publications Internationales

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    A systematic DFT study of (Ti3/2RE1/2)AlC alloys: A new database for adjustable mechanical and electronic properties
    (Elsevier, 2022) Meftah, C.; Iles, N.; Rabahi, L.; Gallouze, M.; Feraoun, H.I.; Drir, M.
    In this study, ab initio calculations based on Pseudo-Potential Density Functional Theory (PP-DFT) method are carried out in order to highlight the partial substitution effect of Rare Earth (RE) elements in the well-known 211-MAX phase of Ti2AlC. The considered elements are Y, Sc and RE = La, Ce, Pr, Nd, Sm, Eu, Gd leading to (Ti3/2RE1/2)AlC alloys. According to the obtained results, the (Ti3/2RE1/2)AlC alloys are significantly less compressible under uniaxial stress along x and z axes. They exhibit high resistance to shearing along [removed] direction. In addition, the calculated heat capacity for (Ti3/2RE1/2)AlC alloys increases with respect to the temperature, a maximum is found in the temperature range 200–300 K. Localized states occur in (Ti3/2RE1/2)AlC alloys due to the f states filling of the rare earth elements. The magnetic moment of (Ti3/2RE1/2)AlC compounds increases according to 4fn(n=2 for Ce to n=7 for Gd) filling. Our findings provide a theoretical database for new tunable properties of (Ti3/2RE1/2)AlC alloys
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    Dynamic characterization of the magnetomechanical properties of off axis anisotropic magnetorheological elastomer
    (De Gruyter Open, 2022) Bendjeddou, Walid; Aguib, Salah; Chikh, Noureddine; Nour, Abdelkader; Djedid, Toufik; Kobzili, Lallia; Meloussi, Mounir
    The use of magnetorheological elastomers in the mechanical and acoustic fields, by the automotive, aeronautical, and building industries, is currently developing strongly and rapidly. The perfect understanding of the capacity of smart insulation based on the absorption of the vibratory waves by magnetorheological elastomers materials passes by the knowledge of their dynamic mechanical behavior. In this present work, we have characterized the dynamic mechanical properties of the magnetorheological elastomer off axes anisotropy by the inclination, of different angles (15°, 30°, and 45°), of the pseudo-fibers of the iron particles formed by the application of a magnetic field at different intensities using an optimal loading rate of 30%. The rubber specimens were prepared by mixing micron-sized iron particles dispersed in room temperature vulcanized (RTV) silicone rubber by solution mixing. The experimental results obtained show a clear dependence of the effect of inclusion of ferromagnetic chains on the magnetomechanical properties. It is observed that the mechanical properties are better when applying a magnetic field of 0.6 T with an angle of inclination of 45°. The improvements added in this work could be useful in several industrial applications, such as automotive, aeronautic through adaptive control of damping and vibration level
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    New generation of fiber self-compacting concrete based on pyrophyllite
    (ICE Publishing, 2021) Mansour, Sabria Malika
    The aim of this work is to develop new-generation ultra-high-performance fiber self-compacting concretes (SCCs) by introducing pyrophyllite rock powder as a cement substitute and assess its effects on the fresh and hardened properties. Three series of concretes were developed. The first series of reference fiber SCCs without pyrophyllite contained 1% adherent steel fibers or 1% slippery polymeric polypropylene fibers or a mixture of 0.5% steel and 0.5% polypropylene fibers. The second and the third series contained fibers and 10 or 20% pyrophyllite. The results showed that incorporation of pyrophyllite generates good fluidity, satisfactory stability without any risk of segregation and an ability to flow in a confined environment without risk of blocking of the fiber SCC. Moreover, the ultrasonic velocity, elastic dynamic modulus and rebound hammer number increase with increasing pyrophyllite rate. Also, a gain in compressive and flexural strengths was obtained at 28 days and the fiber SCCs were judged to be of good quality. The best formulation is the one containing steel fibers and 10% pyrophyllite. This additive has shown its potential to be used as a substitute for cement and its beneficial effect in protecting the environment
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    The effect of carbon black on the curing and mechanical properties of natural rubber/ acrylonitrile- butadiene rubber composites
    (Universidad Nacional Autonoma de Mexico, 2021) Boukfessa, Hind; Bezzazi, B.
    The present work investigates the effect of the amount of carbon black on curing and mechanical properties such as tensile strength, elongation at break, hardness and abrasion resistance of the natural rubber (NR)/ acrylonitrile-butadiene rubber (NBR) blend. For that purpose, a blend composed of 65% NR and 35% NBR filled with different content of carbon black N330 was used. The curing results indicate that the viscosity and the crosslink density of rubber composites increase and the scorch and curing times decrease with increasing the filler content. Mechanical properties such as tensile modulus and hardness of the CB filled NR/NBR blend were remarkably improved, indicating the inherent reinforcing potential of CB. Regarding tensile strength and abrasion resistance, they increase with the addition of carbon black, up to 50 phr. After that, these properties decrease slightly with filler addition