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RISS 인기검색어
- 검색키워드
- 저자 : Mohamed Hamdaoui (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
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Dynamic behavior of a seven century historical monument reinforced by shape memory alloy wires
Karim Hamdaoui,Zahira Benadla,Houssameddine Chitaoui,Mohammed Elamine Benallal 국제구조공학회 2019 Smart Structures and Systems, An International Jou Vol.23 No.4
This work resumes a research that proposes the use of the technique based on the dissipation energy of the shape memory alloy (SMA) ties. It focuses principally on the assessment of the effectiveness of the use of these smart materials on displacements, accelerations and the stresses of the minaret of the great mosque of Ajloun in Jordan. The 3-D finite element model of the minaret is performed by the ANSYS software. First of all, the proposed model is calibrated and validated according to the experimental results gathered from ambient vibration testing results. Then, a nonlinear transient analysis is considered, when the El-Centro earthquake is used as the input signal. Different simulating cases concerning the location, number and type of SMA devices are proposed in order to see their influence on the seismic response of the minaret. Hence, the results confirm the effectiveness of the proposed SMA device.
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Preparation and Characterization of Recycled PP/Organo-Clay Filter for Dyeing Ability
Adel Elamri,Mohamed Hamdaoui,Omar Harzallah 한국섬유공학회 2021 Fibers and polymers Vol.22 No.4
Organo-modified clay was used to prepare waste polypropylene/clay composite by melt mixing method. Composites were then melt spun into linear filaments. Attention is given to how the organoclay influence the morphologyand the dyeability of resultant waste PP filaments. Scanning electron microscopy was used to investigate the surfacemorphology and cross section of the filaments. Dyeing studies underlined the improvement of dye affinity of elaboratedfilaments to acid, basic, and disperse dyes. Moreover, we observed that waste PP and its composite monofilaments have thehighest dyeability when using disperse dye. The prepared filaments were then used to fulfill a filter for the treatment of textiledye waste water. Thus, 3D geometrical design of the filter structure was realized by the SolidWorks mechanical designsoftware.
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Sarra Said,Mohamed Hamdaoui,Walid Sahraoui 한국섬유공학회 2023 Fibers and polymers Vol.24 No.1
This paper presents the study of the application of direct dyes on pre-treated cotton jersey knitted fabric using an experimentalsystem based on the capillary rise technique. The developed device ensures the vertical suspension of a cloth surface incontact with a dyeing bath and allows the capillary rise of the dye bath in the textile structure. A series of experiments werecarried out using cotton jersey knitted fabric as textile fabric model and the direct dyes bath (wetting agent, salt, sodiumcarbonate and direct dye) as wicking liquids by using an electronic microbalance. A mathematical model was developedto interpret the experimental data in terms of kinetic parameters of the absorbed dye bath amount and the diffusion of themolecule into the cotton jersey knitted fabric. The results show that the double-exponential kinetics model and the simplifiedCrank solution to Fick’s second law equation are in reasonable agreement with experimental data of the absorbed dye bathamount and the diffusion of the molecule of dye into the cotton jersey knitted fabric, respectively.
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Eco-Friendly Dyeing of Wool Fabrics with Natural Dye Extracted from Citrus Sinensis L Peels
Zouhaier Romdhani,Nesrine Sakji,Mohamed Hamdaoui 한국섬유공학회 2022 Fibers and polymers Vol.23 No.6
Biomass has emerged as a sustainable and renewable resource for dyestuff production. There is an increasinginterest like as in a natural chemical agent, especially in dyeing pigments. This study concerns the purification of naturaldyestuff extracted from an abundant plant Citrus Sinensis L. Applications of this dye on wool fibers were investigated. Therefore, the mordanting methods and mordant agents were carried out. The dyeing behavior was assessed; the colorchanges were measured using Spectra Flash-Data Color, SF-600 in terms of CIE L*10 a*10 b*10 and the color strength (K/S). Hence, the color fastness properties were studied. Results obtained show that the optimum extraction conditions were thetemperature of 90 °C, the extraction time of 90 min and the pH value equal to 5. The dyeing of wool fibers has beenoptimized and the optimal conditions are; the temperature of 90 °C, the dyeing time of 90 min, and pH value equal to 3. Thestudy of mordant type and mordanting methods indicates that the concentration of 5 % (w/w) is sufficient, the iron sulfate isthe most adequate mordant which provides the deeper color. The post-mordanting method produces slightly deeper color thanthe pre-mordanting and simultaneous processes. Then, direct dyeing offers encouraging results. Therefore, dyeing of woolfabric with this natural dye produces excellent color fastness properties. Finally, the Citrus sinensis L peels was veryabundant and available substance which may be great potential to be used as a natural colorant.
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