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      저자 : R. Eslami-Farsani (검색결과 3 건)
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      • KCI등재

        Effect of Shape Memory Alloy Wires on the Buckling Behavior of Fiber Metal Laminates

        R. Eslami-Farsani,M. R. Mohaseb Karimlou,A. Saeedi,A. Zamani 한국섬유공학회 2019 Fibers and polymers Vol.20 No.8

        Buckling behavior of shape memory alloy (SMA) reinforced fiber metal laminates (FML) was experimentallyinvestigated. The SMA reinforced FML specimens with three different pre-strain levels (1, 2 and 3 %) and different numberof the embedded wires (2, 4 and 6 wires) were prepared by a specific mold and hydraulic pressure. The effects of the appliedpre-strains in the SMA wires, as well as the stacking sequence of the laminate, SMA volume fraction and the location of thewires were studied on the axial and lateral force-displacement diagrams for the specimens during buckling tests. According tothe results, 53 % enhancement in the buckling load was obtained for 2 SMA wires reinforced FML specimens in comparisonwith the specimens without embedded SMA wires. In constant volume fraction of the SMA, pre-straining the wires by 3 %led to 25 % improvement in the buckling load, in comparison with the specimens reinforced with 1 % pre-strained wires. Theinfluence of the FML stacking sequence on the results was also discussed.

      • KCI등재

        Investigation of Longitudinal and Transverse Reinforcing Single Lap Joints of the Polymer Composites/Al under Hygrothermal Condition

        F. Jafari,R. Eslami-Farsani,S.M.R. Khalili 한국섬유공학회 2020 Fibers and polymers Vol.21 No.10

        In this study, the effect of longitudinal and transversal reinforcing of epoxy based carbon fiber reinforcedcomposite/Al (CFRP/Al) and glass fiber reinforced composite/Al (GFRP/Al) single lap joints (SLJs) by using of pins andwires has been investigated under hygrothermal conditions. Overall three sets of specimens for each composite/Al joint weremanufactured which consist of single lap joint (SLJ), single lap joint reinforced with 6 steel pins of 1 mm diameter intransverse direction (SLJP) and single lap joint reinforced with wires of diameter 0.2 mm, in longitudinal direction (SLJW)for CFRP/Al and GFRP/Al adherends. The tensile properties of the samples were measured after 500 and 1000 hrs. inhygrothermal conditions of 70 ºC, relative humidity of 85 % and compared corresponding to unheated samples. The resultsshow that using of pins, increases the tensile strength by 14 % in GFRP/Al and 13.7 % in CFRP/Al SLJs. Also wire increasedthe tensile strength of the SLJs by 26 % in GFRP/Al and 19 % in CFRP/Al SLJs. Hygrothermal conditions decreased thetensile strength of both GFRP/Al and CFRP/Al SLJs samples, where the highest degradation was observed in simple GFRP/Al SLJs (34.45 %) and the lowest was in wire reinforced CFRP/Al SLJs (21 %). Overall it could be concluded that wires andpins increases the lifespan of both CFRP/Al and GFRP/Al SLJs under hygrothermal conditions.

      • KCI등재

        High Velocity Impact Response of Basalt Fibers/Epoxy Composites Containing Graphene Nanoplatelets

        E. Kazemi-Khasragh,F. Bahari-Sambran,M. Hossein Siadati,R. Eslami-Farsani 한국섬유공학회 2018 Fibers and polymers Vol.19 No.11

        The effects of adding surface modified graphene nanoplatelets (GNPs) in various weight percentages (0, 0.1, 0.2, 0.3, 0.4, 0.5 with respect to matrix) on the high velocity impact response of basalt fibers/epoxy composites were evaluated. High speed mechanical stirrer and ultrasonic waves were used for the dispersion of GNPs in the epoxy matrix, and hand layup method was utilized for the fabrication of the composite samples. High velocity impact testing was performed using a conical projectile. The results demonstrated that the maximum improvement in the impact limit velocity and energy absorption occurred in the 0.3 wt.% GNPs nanocomposite, i.e., 11 and 23 %, respectively. Also, the electron microscopy studies revealed that the addition of GNPs contributed in improving the impact properties by influencing the matrix and thus enhancing the interfacial characteristics between the basalt fibers and the matrix.

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