• Title/Summary/Keyword: 샌드위치 판

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Improvement on Interfacial, Thermal, and Water Resistance Properties of Wood Sandwich Composites for Stone Bed using CNT-Animal Glue Adhesive (탄소나노튜브/아교 접착제를 이용한 돌침대용 목재 샌드위치 복합재의 계면, 열적 및 방수특성 증가)

  • Kim, Jong-Hyun;Kwon, Dong-Jun;Shin, Pyeong-Su;Baek, Yeong-Min;Park, Ha-Seung;Moon, Sun-Ok;Park, Joung-Man
    • Composites Research
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    • v.30 no.4
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    • pp.235-240
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    • 2017
  • Animal glue, a water-soluble adhesive, has been used historically for high-performance traditional furniture despite the disadvantage of weakness against moisture. Many scientists studied the ways to improve water resistance of animal glue. Improvements on the interfacial, thermal, and water resistance properties of wood sandwich composites (WSC) was studied with carbon nanotube (CNT) wt% in animal glue. Real-time temperature of WSC was measured after WSC was heated with increasing CNT wt%. Lap shear test was performed to determine the interfacial properties of wood and animal glue with CNTs. Water resistance properties of animal glue were determined by lap shear test using specimens dipped in water and the results were compared with the dry case. Hydrophobicity of animal glue by static contact angle was correlated with the variation of lap shear test. Interfacial, thermal, and water resistance properties for animal glue were improved with properly added CNTs.

A Study on the Optimum Design and Structural Behaviors of Aluminium Extrusions (알루미늄 압출재의 구조적 거동 특성 및 최적설계에 관한 연구)

  • S.I. Seo;K.H. Son
    • Journal of the Society of Naval Architects of Korea
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    • v.35 no.1
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    • pp.88-97
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    • 1998
  • Large aluminium extrusions can be used in rolling stocks and high speed vessels to reduce weight and labor cost. As sandwich plates with corrugated core have enough strength in transverse and longitudinal direction, welding lines to connect members are reduced and transverse members to strength longitudinal members are not required. However, for proper design of aluminium extrusion plates, understanding of structural behaviors of the exclusions are necessary. In this paper, at first, detailed finite element analysis is carried out to understand structural behavior. And then, simple theoretical formulas for design purpose are proposed using the orthotropic plate theory. Shear stresses resulting from end twisting which is characteristics of deep aluminium extrusion plates can also be calculated by the simple theoretical formula. Comparison with the results by detailed finite element analysis shows good accuracy of the proposed simple formulas. The simple formulas can be useful in repetitive analysis in the initial design stage.

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Size Effects in the Failure of Simple Supported Sandwich Slab Bridges (단순지지된 샌드위치 슬래브교량의 파괴시 치수효과)

  • Han, Bong-Koo;Kim, Duck-Hyun
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.14 no.3
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    • pp.83-90
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    • 2010
  • Composite materials can be used economically and efficiently in civil engineering applications when standards and procedure for analysis, design, construction and quality control are to be established. Bridge systems, including the girders and cross-beams, and concrete decks behave as the specially orthotropic plates. For such systems with sections, boundary conditions other than Navier solution types, it is very difficult to obtain its analytical solution. To design the bridge made by the composite materials, cross-section was used as the form-core shape for economical reason and finite difference method was used for output of the stress value. The Tsai-Wu failure criterion for stress space is used. In this paper, the rate of tensile strength reduction due to increased size was considered. And also numerical study is made for these cases.

Development of Airframe Structure for Disaster and Public Safety Multicopter UAV (재난치안용 멀티콥터 무인기 기체구조 개발)

  • Shin, Jeong Woo;Lee, Seunggyu;Noh, Jeong Ho
    • Journal of Aerospace System Engineering
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    • v.14 no.3
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    • pp.69-77
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    • 2020
  • Airframe structure development of the 35 kg class 'Disaster and Public Safety Multicopter' UAV is described in this paper. To reduce the airframe weight, T-700 grade CFRP composite material was used, and the fuselage was designed with the semi-monocoque structure and plate installed with the control and communication devices designed in a sandwich structure. The specimen tests for the laminated plate and pipe were conducted to verify the strength and stiffness of the designed parts. The stacking sequence of composite materials was determined by the static strength and vibration analysis, and landing gear strut was designed by the nonlinear analysis with decent speed and ground clearance requirements. The static strength test was performed to evaluate the structural integrity and to verify the landing gear behavior.

Development and Application of a Novel Mammalian Cell Culture System for the Biocompatibility and Toxicity of Polymer Films and Metal Plate Biomaterials (고분자필름과 금속막 의료소재에 대한 생체적합성 및 독성 평가를 위한 새로운 세포배양시스템의 개발 및 적용)

  • Kwak, Moon Hwa;Yun, Woo Bin;Kim, Ji Eun;Sung, Ji Eun;Lee, Hyun Ah;Seo, Eun Ji;Nam, Gug Il;Jung, Young Jin;Hwang, Dae Youn
    • Journal of Life Science
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    • v.26 no.6
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    • pp.633-639
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    • 2016
  • Biomaterials including polymer, metal, ceramic, and composite have been widely applied for medical uses as medical fibers, artificial blood vessels, artificial joints, implants, soft tissue, and plastic surgery materials owing to their physicochemical properties. However, the biocompatibility and toxicity for film- and plate-form biomaterials is difficult to measure in mammalian cells because there is no appropriate incubation system. To solve these problems, we developed a novel mammalian cell culture system consisting of a silicone ring, top panel, and bottom panel and we applied two polymer films (PF) and one metal plate (MP). This system was based on the principal of sandwiching a test sample between the top panel and the bottom panel. Following the assembly of the culture system, SK-MEL-2 cells were seeded onto Styela Clava Tunic (SCT)-PF, NaHCO3-added SCT (SCTN)-PF, and magnesium MP (MMP) and incubated at 37℃ for 24 hr and 48 hr. An MTT assay revealed that cell viability was maintained at a normal level in the SCT-PF culture group at 24 or 48 hr, although it rapidly decreased in the SCTN-PF culture group at 48 hr. Furthermore, the cell viability in the MMP culture group was very similar to that of the control group after incubation for 24 hr and 48 hr. Together, these results suggest the sandwich-type mammalian culture system developed here has the potential for the evaluation of the biocompatibility and toxicity of cells against PF- and MP-form biomaterials.

Experimental Study to Estimate the Required Flow of Fire Extinguishing System for Flame Spread Prevention on Composite Panel (복합패널 화재확산 방지를 위한 소화시스템의 소요유량 산정을 위한 실험적 연구)

  • Park, Byoung-Jik;Shin, Hyun-Jun;Yoo, Yong-Ho;Park, Jin-Ouk;Kim, Hwi-Seong;Kim, Yang-Kyun
    • Fire Science and Engineering
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    • v.31 no.6
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    • pp.33-39
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    • 2017
  • Composite panel refers to the particular plywood produced in a way of stacking the different kinds of material in sandwich form and adhering them using adhesives and is widely used as building material for its constructability and cost efficiency. But as the surface is finished with steel plate, fire extinguishing agent cannot reach to the core material because of such steel plate on surface which causes the difficulties in suppressing the fire as well as in fire-fighting activities due to collapse. This study, to deal with such problem, is intended to set the fire pipe in core material to prevent the fire from spreading and in a bid to achieve this using minimized fire water, water supply test device was fabricated to estimate the required water flow of fire extinguisher and consequently, optimal water flow (0.5 L/min) was determined through a full-scale fire test.