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- 저자 : Aliasghar Alamdar-Yazdi (검색결과 2 건)
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Mechanical Behavior of 3D Orthogonal Woven Jute-polyester Hybrid Composites
Mohammad Hasan Boroomand,Aliasghar Alamdar-Yazdi,Mohammad Saleh Ahmadi 한국섬유공학회 2022 Fibers and polymers Vol.23 No.12
3D composites have some advantages such as higher resistance to delamination over 2D composites. Jute fiberreinforcedcomposites have received a lot of attention in recent years due to their lightness, biodegradability, and low price. These composites, on the other hand, have relatively low mechanical properties and in many cases brittle behavior. In thisresearch hybridizing jute with high tenacity polyester fibers was considered as a solution for these problems. Six types of 3Dorthogonal hybrid woven fabrics from jute and high tenacity polyester yarns with various hybridization ratios were producedand then converted to 3D composites by vacuum infusion process (VIP) using unsaturated polyester resin. The effect ofhybridization on tensile, flexural, and impact properties of 3D orthogonal woven jute-polyester hybrid composites withunsaturated polyester matrices is investigated. The results showed that increasing the percentage of polyester fibers (25 %),tensile strength (30.5 %), impact resistance (24 %), and flexural modulus (25 %) increased, but flexural strength (13 %) andtensile modulus (43 %) decreased. Moreover, higher flexibility and strain rate of polyester fibers prevent sudden fracture ofthe hybrid composites. Placement of polyester fibers in the outer layers of hybrid composite samples has a better effect on theflexural strength and impact resistance of composites than placement in the middle layers. Comparing the mechanicalproperties of 3D orthogonal woven jute-polyester hybrid composites samples, it was observed that the sample contained70 % jute and 30 % polyester (P3JF) had the highest flexural strength and impact resistance which were 25 % and 48 %higher than the sample containing 100 % jute (J), respectively. Moreover, the samples that contain 50 % jute and 50 %polyester (PJJP and JPPJ) had the highest tensile strength among the samples. The sample that contains 80 % jute and 20 %polyester (P3J7) has the highest flexural modulus, which is 50 % higher than the J sample. The fracture surfaces of thecomposites were observed under a scanning electron microscope (SEM) and the fiber-matrix adhesion was analyzed.
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Milad Sadeghi-Sadeghabad,Aliasghar Alamdar-Yazdi,Mohammad R. Fazel,Hasan Mashroteh 한국섬유공학회 2020 Fibers and polymers Vol.21 No.6
One of the most important behaviors of a rug is its compression-recovery effect. This paper compares thecompression properties of a conventional and a new Persian rug. In the new rug, some free spaces are created in the base partwithin the warp sheets. To do the comparison experiments, five rug samples were produced: A conventional Persian rug asthe comparison criterion plus four new types of rugs named Double-base Persian (DBP) rugs. At first, a theoretical analysisof the compression process in both conventional and new rugs is presented for further comparisons and validation. Then,using the tensile tester compression-recovery curves of the rug samples were obtained and experimentally investigated. Results of the theoretical analysis showed that in conventional rug, diameter, length and young’s modulus of pile yarn andapplied load are effective parameters, and in DBP rugs, in addition to those parameters, the gap size and warp yarn diameterare effective parameters on the compression deformation. Also, the experimental results showed that when a gap isintroduced in the rug base, the comfort and compressibility were significantly improved. Besides, increasing the distancebetween the two warp sheets effectively improves the comfort and compressibility of the DBP rugs.
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