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    Tytuł:
    Free vibration analysis of composite face sandwich plate strengthens by Al2O3 and SiO2 nanoparticles materials
    Autorzy:
    Al-Shablle, Marwan
    Njim, Emad Kadum
    Jweeg, Mushin J.
    Al-Waily, Muhannad
    Powiązania:
    https://bibliotekanauki.pl/articles/2203639.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
    Tematy:
    sandwich panel
    analytical solution
    composite-face
    nanoparticles
    płyta warstwowa
    rozwiązanie analityczne
    nanocząstka
    Opis:
    The main novelty of the paper is that analytical, experimental, and numerical analyses are used to investigate the free vibration problem of a sandwich structure in which Nanocomposites skins (SiO2/epoxy and Al2O3/epoxy) at different densities are used as the face sheet. The volume fraction's of nanoparticle addition varies (0% to 2.5%). The present free vibration was derived based on Kirchhoff's theory and aspiration to obtain the natural frequency. The results show that in structures with SiO2 nanoparticles with a density of 1180 kg⁄m3, the optimum increase (VF = 2.5%) is 50% in Young's modulus and 22% in natural frequency, while at a density of 1210 kg⁄m3 is 56 % in Young's modulus and 24.5% in natural frequency. Furthermore, the same structures reinforced with Al2O3 Nano-particles show that at the density of 1180 kg⁄m3 , the optimum (VF=2.5%) parentage increase in Young's modulus is 41% and 19% in natural frequency, while at the density of 1210 kg⁄m3 is 46% in Young's modulus and 21% in natural frequency. A numerical investigation was used to validate the obtained results of the analytical solution. The findings also show an acceptable convergence between analytical and numerical techniques with a maximum discrepancy not exceeding 3%.
    Źródło:
    Diagnostyka; 2023, 24, 2; art. no. 2023205
    1641-6414
    2449-5220
    Pojawia się w:
    Diagnostyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analytical evaluation of the influence of adding rubber layers on free vibration of sandwich structure with presence of nano-reinforced composite skins
    Autorzy:
    Al-Shablle, M.
    Al-Waily, M.
    Njim, E.K.
    Powiązania:
    https://bibliotekanauki.pl/articles/24200573.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    sandwich panel
    analytical solution
    composite-face
    nanoparticles
    rubber layer
    panel warstwowy
    rozwiązanie analityczne
    kompozyt-powierzchnia
    nanocząsteczki
    warstwa gumy
    Opis:
    Purpose: Developing structural designs that offer superior vibration properties is still a major challenge, but they stay solid and lightweight simultaneously. Composite faces are frequently used in insulating constructions as an alternative to sheet metal roofs. Rubber overlays have been added to reduce waves' natural frequency and fade time. Design/methodology/approach: The mechanical properties and the natural frequency calculation of the materials that make up the composite structural panels designed for structural applications with the addition of rubber layers were studied in this study. Findings: The results showed the addition of rubber layers with SiO2 nanoparticles with a density of 1180 kg m3, and the optimal decrease (VF = 2.5%) is 38.5% in the natural frequency while at a density of 1210 kg/m3, it is 40.2% in the natural frequency. While the addition of rubber layers with Al2O3 nanoparticles shows a density of 1180 kg/m3, the optimum reduction (VF = 2.5%) is 41% in HF while at a density of 1210 kg/m3 36.8% in an NF 41% during a density of 1210 kg/m3 38.4%. Research limitations/implications: Certain hypotheses were used to apply Kirchhoff's theory to solve the mathematical model of the structure. Practical implications: The work was carried out on the faces of nanocomposites made of SiO2/epoxy and Al2O3/epoxy with different densities and polylactic acid core. The inclusion of nanoparticles as a percentage of the fraction size ranges from 0% to 2.50%. Originality/value: This study's results shed light on the fundamental behaviour of the components that make up the sandwich in the presence of rubber layers.
    Źródło:
    Archives of Materials Science and Engineering; 2022, 116, 2; 57--70
    1897-2764
    Pojawia się w:
    Archives of Materials Science and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterization and optimization of spectrophotometric colour removal from dye containing wastewater by Coagulation-Flocculation
    Autorzy:
    Obiora-Okafo, I. A.
    Onukwuli, O. D.
    Powiązania:
    https://bibliotekanauki.pl/articles/779809.pdf
    Data publikacji:
    2018
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    coagulation-flocculation
    natural organic polymer
    fibre-metric analysis
    spectrophotometer
    face-centred central composite design
    Opis:
    The performance of Vigna unguiculata coagulant (VUC) for colour removal from acid dye was investigated in this study. The proximate, structure and morphology of the coagulant were investigated using standard official methods, Fourier-Transform Infrared (FTIR) spectrometer and scanning electron microscopy (SEM), respectively. Response surface methodology (RSM) using face-centred central composite design (FCCD) optimized four process variables including pH, coagulant dosage, dye concentration and time. The colour removal efficiency obtained from the optimization analysis was 99.26% at process conditions of pH 2, coagulant dosage 256.09 mg/l, dye concentration 16.7 mg/l and time 540 min. The verification experiments agreed with the predicted values having a standard error value of 1.96%. Overlay contour plot established optimum areas where the predicted response variable is in an acceptable range (≥ 70%) with respect to optimum conditions. The FCCD approach was appropriate for optimizing the process giving higher removal efficiency when compared to the main effect plots.
    Źródło:
    Polish Journal of Chemical Technology; 2018, 20, 4; 49-59
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study on the Pore and Fibre metric Characteristics of Natural Organic Polymer for Colour Degradation in Wastewater: Face-Centred Central Composite Design
    Autorzy:
    Obiora-Okafo, Ifeoma Amaoge
    Onukwuli, Okechukwu Dominic
    Powiązania:
    https://bibliotekanauki.pl/articles/1193490.pdf
    Data publikacji:
    2021
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Biebrich scarlet
    Coagulation-flocculation
    Face-centred central composite design
    Natural organic polymer
    Overlaid contour plot
    Vigna subterranean
    Opis:
    The use of natural organic polymer (NOP) coagulants in the removal of pollutants from industrial wastewater has been the subject of continuous research. The importance of applying Vigna subterranean coagulant (VSC) for colour removal from crystal Ponceau 6R dye was investigated in this study. The precursor's proximate analysis, structure, surface morphology, fibre metric, and pore size distribution were examined. The pH, coagulant dosage, dye concentration, and time were optimized using response surface methodology (RSM) and face-centred central composite design (FCCD). For the coagulant precursor, the proximate analysis gave high protein content of 18.15 %, the Fourier Infra-Red (FTIR) analysis confirmed the existence of O-H, N-H, and C=H, the SEM image revealed polymer rough surfaces, the most occurring pore size of 0.41 μm2, different fibre length between 2.11 μm -17.94 μm, and a compact net structure. As can be seen in the main effects plots, pH has the greatest impact on colour removal, followed by time. Coagulant dosages and dye concentration have less influence on the process. The colour removal efficiency obtained from the optimization analysis was 99.60% at process conditions of pH 2.11, coagulant dosage 293.32 mg/L, dye concentration 13.75 mg/L and time 533.3 min. The projected values were confirmed in the verification experiments, with a standard error of 2.10 %. Overlay contour plot established optimum areas where the predicted response variable is in an acceptable range (≥ 80%) with respect to optimum conditions. When compared to the main effect plots, the FCCD approach proves more appropriate for improving the process and yielding higher removal efficiency. As a result, protein extract from Vigna subterranean seed has the potential to be used as an effective coagulant for colour removals from industrial wastewaters.
    Źródło:
    World Scientific News; 2021, 159; 20-44
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nonlinear postbuckling behavior of auxetic-core toroidal shell segments with Graphene reinforced face sheets under axial loads
    Autorzy:
    Nam, V. H.
    Duc, V. M.
    Doan, C. V.
    Thanh Xuan, N. T.
    Phuong, N. T.
    Powiązania:
    https://bibliotekanauki.pl/articles/38693072.pdf
    Data publikacji:
    2022
    Wydawca:
    Instytut Podstawowych Problemów Techniki PAN
    Tematy:
    axial compressive
    tensile load
    nonlinear buckling
    graphene reinforced composite
    auxetic-core
    face sheet
    toroidal shell segment
    Opis:
    The main aim of this paper is to provide an analytical approach for the nonlinear buckling behaviors of toroidal shell segments made by three layers included honeycomb auxetic-core and two Graphene reinforced face sheets under axial compressive or tensile loads. The auxetic core is designed in a honeycomb form and three distribution laws of Graphene are considered for two symmetric face sheets. The homogenization technique for honeycomb auxetic plates and shells is applied to establish the stiffness formulations of the core. By approximating the doubly curved coordinate to the simpler coordinate with the Stein and McElman assumption, the nonlinear basic equations are formulated using the nonlinear Donnell shell theory and the model of the two-parameter foundation. The Galerkin method can be performed three times for three states of buckling responses and the expressions of the load-deflection postbuckling curves can be determined. The numerical examinations present that the bifurcation buckling occurs with both axial tensile and compressive loads for convex and concave shells and the significantly beneficial effects of auxetic core and functionally graded Graphene reinforced face sheets on nonlinear buckling responses of shell segments.
    Źródło:
    Archives of Mechanics; 2022, 74, 2-3; 89-108
    0373-2029
    Pojawia się w:
    Archives of Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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