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RISS 인기검색어
- 검색키워드
- 저자 : Ali. A. A. Jeddi (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
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Knitted Fabric Relaxation by Ultrasound and Its Characterization with Yarn-pullout Force
Jeddi, Ali A. A.,Mohammadi, V.,Rahimzadeh, H.,Honarvar, F. The Korean Fiber Society 2007 Fibers and polymers Vol.8 No.4
An investigation on the dimensional properties of plain knitted fabric produced from cotton yarn and subjected to different relaxation treatments is presented in this paper. The main aim of this research is to characterize the internal energy of fabric by using yarn-pullout test method in ultrasonic relaxation state and compare it with other common mechanical relaxation treatments. A comprehensive experimental analysis showed that, by using ultrasonic waves, the area geometry constant value $(k_s)$ achieved was higher than the conventional relaxation methods. Then, we introduced residual-energy forming and loss-energy uniforming. The former appeared due to fabric shrinkage and the later one appeared due to release of fabric loops from extra forces which imposed during knitting process. The results also indicated that ultrasonic waves energy causes more uniformity on loop and consequently, the fabric reaches to a less internal energy than washing treatment.
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Resin Capacity of Technical Woven Fabrics: Pore Volume and Pore Shape Simulation
Hamid Reza Sharafat,Mehdi Kamali Dolatabadi,Ali. A. A. Jeddi 한국섬유공학회 2020 Fibers and polymers Vol.21 No.11
Nowadays, technical woven fabrics are broadly utilized as reinforcement of composites. Resin capacity of wovenfabric is one of the main challenges in laminate fabrication. Resin diffusion during fabrication of the composite is extremelydepended on fabric micro-morphology. The geometry of weave unit cell and its pore are fundamental factors in evaluatingresin capacity and resin diffusion within fabrics. The main attempt of this study was obtaining an approach to evaluate resincapacity of a woven fabric via simulating pore shape and pore volume. For this purpose, four basic unit cells for all kind ofweaves were simulated with the two shapes of tow cross-section: lens and racetrack. Afterwards, 3D shape and volume oftheir pores were simulated using this approach. The proposed approach is established on the base of initial data of fabric suchas tow setts, tow titers, planar density and thickness of a technical fabric. To assess the simulation, three types of wovenfabrics namely, plain, twill and satin were impregnated by epoxy resin using vacuum infusion process. The volume fractionsof the matrix and fibers of real composites were compared with simulated ones. It was demonstrated that the approach withracetrack assumption led to high degree of convergence with experimental results. The maximum relative error of pioneeredmethod to evaluate volume of the pore in this condition exceeded up to 1.43 %. Suitable correlation between volumefractions of the pore and void was observed in experimental data. It is experimentally demonstrated that the void volumefraction of composite will be increased with decrease of pore volume due to difficulty of wetting. In this paper, it is illustratedthat the resin capacity of a woven fabric is a function of vacuum level in vacuum infusion process. For instance, resincapacity of a certain plain fabric could be reduced up to 10 % under 60 kPa (0.6 bar) of vacuum in contrast with steady stateof fabric at room atmosphere.
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