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RISS 인기검색어
- 검색키워드
- 저자 : Suardana Ngakan Putu Gede (검색결과 5 건)
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Suardana Ngakan Putu Gede,Yingjun Piao,Ri Xu,Jae Kyoo Lim(임재규) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
In this study, mechanical properties of coir/PLA composites were studied under different water immersion time. Coir/PLA composite were prepared using coir fiber treated with NaOH and NaOH followed by soaking in acrylic acid (AA) 0.5% solution with varying immersion time. Fraction volume of the fibers in the PLA composites was fixed at 40%. Water absorption, tensile and flexural properties of these composite were analyzed. The tensile and flexural test are conducted according to ASTM standard D3039 and ASTM D790, respectively. The water uptake process for all specimens sharply increased and approach saturation after 169h. Th e composite with NaOH treated of fiber was the highest to absorb the water. Overall, composites with NaOH followed by AA as a chemical treatment of coir fiber have greater tensile and bending strength than those of untreated and NaOH treated fiber. Based on the immersion time for coir in the AA solution, the maximum tensile and bending strength of composites occur at 0.5h for all water immersion time of composites. The flexural properties of PLA/coir composites shows a decrease tendency when 6h water immersion. Tensile fracture surface morphologies of the composites were observed using SEM method.
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Mechanical properties of coconut filter fiber
Suardana Ngakan Putu Gede,Ruihua Hu,Yoon Ho-Chel,Chul-In Kim,Yingjun Piao,Ri Xu,Jae Kyoo Lim 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
In this study, mechanical properties of single coconut filter (CF) and coconut husk (CH) fiber were compared under the same chemical treatment conditions. The fibers were subjected to various surface treatments as follow: CF and CH fibers were treated using 6%w/v NaOH solution at 95℃ for 3 hours, respectively, and then they were washed with water to remove NaOH solution sticking to the fiber surface and dried in oven for 24 hours at 70℃. After that they were soaked in 0.5%, 1%,3% acrylic acid for 0.5, 1 and 3 hours and then washed with distilled water and dried in oven at 70℃ for 72 hours. The tensile test is conducted according to ASTM standard (C1557-03). Tensile strength, Young's modulus (E) and strain at break (ε<SUB>b</SUB>) were evaluated. Mechanical properties of CF fiber are more than twice of those of CH fiber except the strain at break (ε<SUB>b</SUB>) is lower than that of CH. NaOH treated fibers (CF and CH) have higher tensile strength, E and ε<SUB>b</SUB> than those of untreated fibers. Based on the immersion time, the maximum tensile strength and E of CF occur at 0.5h immersion for all acrylic acid concentration. They show a decrease tendency when the immersion time increased. While the maximum tensile strength and E of CH occur at 3h immersion for all acrylic acid concentration and the lowest tensile strength and E at 1h acrylic acid immersion but higher than untreated. The maximum tensile strength and E of both CF and CH occur at 0.5% acrylic acid for all immersion time and show a decrease tendency when the acrylic acid concentration increased. Surface morphologies of the fiber were observed using SEM method and FTIR for characterizing chemically modified fiber.
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Abdalla Abdal-hay,임재규,Ngakan Putu Gede Suardana,정도연,최광석 한국정밀공학회 2012 International Journal of Precision Engineering and Vol.13 No.7
Natural fibers as reinforced polymer composites have recently been the center of attention among researchers. Surface modifications and variations in the fiber diameters are major factors that influence the fiber adhesion performance inside the matrix. Experiments have been performed to further the development of natural fiber reinforced polymers as a replacement for glass fibers. In the present research, date palm fibers (DPFs) with three different size ranges of diameters (800-600, 600-400, and 400-200 μm) and the influence of alkali treatment on their characteristics have been investigated. Morphology observations (SEM), EDS density mapping (quantitative elemental analysis), X-RD, and FTIR spectroscopy of treated and untreated fibers were carried out. In addition, the tensile properties of a single fiber and composites consisting of fibers/epoxy with discontinuous random oriented short fibers both with and without chemical modification were studied. The results showed that DPFs are amenable to chemical modification particularly in the fine fiber case. It was found that the ultimate tensile strength and percentage elongation of a single fiber after alkali treatment increased by 57% and 24.7 %,respectively. Because alkali treatment of the DPFs was able to provide a good adhesion within the matrix, the tensile strength, elastic modulus and the fiber-matrix interaction of the composite were improved. Collectively, the addition of the proposed DPFs may open a new avenue for the exploitation of this natural cheap material to produce a green composite.
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대마/유리섬유 강화 복합재료의 제조 및 기계적 특성에 관한 연구
박영준(Yingjun Piao),수아다나(Suardana Ngakan Putu Gede),허일(Ri Xu),이중희(Joong Hee Lee),임재규(Jae Kyoo Lim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
In this study, Hemp/Glass fiber hybrid composites were fabricated using hot compression mold method. The mechanical properties of the composites with three different fiber weight fractions were measured in order to investigate the effects of different composition and hemp fiber surface treatment by NaOH on the properties of the composite. Among tested samples, 50w%fiber composites show the highest of mechanical properties. The surface treated fiber composites exhibit higher mechanical properties comparing to the untreated fiber composites. The fracture surface of the composite was also observed by using SEM to understand the interface interaction between fibers and matrix.
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The Fracture Property of Biodegradated Natural Fiber Reinforced Composites
Renliang Wang,Jun Hee Song,Ruihua Hu,Ho Chel Yoon,Ngakan Putu Gede Suardana,Yon Jig Kim,Jae-kyoo Lim 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.3
Biodegradable natural composite is enormously applied in industrial production. The present work is concerned with effect of chemical treatment on the fracture study of natural fiber reinforced PLA. The fibers were from hemp and rice straw contrastively. The elastic modulus and tensile strength of PLA were2300 ㎫ and 32 ㎫ respectively. The chemical treated fibers and non-treated fibers were used as reinforcement to improve the mechanical properties. Chopped fibers, the component of unidirectional fiber composites, were made by hand and deposited together with PLA films layer by layer in the compression mold. The properties of tensile strength and elastic modulus performed stable in 35 wt% natural fiber composites. The rice straw fiber composites performed good stabilities especially in 50 wt% ones. The SEM showed a typical matrix failure in the morphology observation. Both hemp fiber and rice straw fiber presented good properties in their own ways.
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