• Title/Summary/Keyword: material evaluation

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A semantic Study on Environmental-friendly of Interior Architecture materials (실내건축재료의 환경친화에 관한 의미론적 고찰)

  • 강승모;권자인
    • Korean Institute of Interior Design Journal
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    • no.28
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    • pp.117-123
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    • 2001
  • In 1990s, interest on Environment has been increased and Environment-oriented consumer's economic power accelerated the trend of preference for 'Environment-friendly material'. Moreover, the concept of 'Sick Building' Syndrome has been spread to the public and solution for the syndrome is required. 'Environment-friendly material'means that the material used is not harmful for the user's health, and on top of that, causes least harm to the environment during production/scrap process of the material itself. Decision of designers and architectures, as a result, is really crucial tot he environment issues. Above all, selecting the most environment-friendly material and design among possible candidates is natural and cost saving way. In the paper, couple of Evaluation Criterium for Material Selection are analyzed and objective linkage has been identified. With the result of analysis, methodology to minimize damage on environment during whole life cycle of the Interior Design has been sought for.

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A Study on The Strength Evaluation of welded Joints for Degraded Material (열화재 용접부의 강도평가에 관한 연구)

  • 정의정;윤한용
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.05a
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    • pp.705-710
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    • 2002
  • Welding is used not only during the shipbuilding, but also during the repairing of ships. While repairing of ships, it is inevitable to weld new materials with degraded materials. In this case, it is predicted that the strength of both the sections is not identical each other. In this study, the respective welded joints in terms of mechanical properties such as microstructure, mechanical strength and fatigue crack propagation, with the component obtained from the barge used for a long-term period, were analyzed. It was found that the material degradation had a significant effect on the welded joints. The fatigue crack propagation in welded sections showed a big difference. The rate of fatigue crack growth of degraded material for both heat affected zone and parent metal was faster than that of new material. By contrast, The result within identical materials showed that the heat-affected zone was slower than that of parent metal

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A Study on the Strength Evaluation of Welded Joints for Degraded Material (열화재 용접부의 강도평가에 관한 연구)

  • 정의정;윤한용;임명환;김태식
    • Journal of the Korean Society for Precision Engineering
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    • v.19 no.11
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    • pp.75-82
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    • 2002
  • Welding is used not only for the shipbuilding, but also for the repairing of ships. While repairing of ships, it is inevitable to weld new materials with degraded materials. In this case, it is predicted that the strength of both the sections is not identical each other. In this study, the respective welded joints in terms of mechanical properties such as microstructure, mechanical strength and fatigue crack propagation, with the component obtained from the barge used for a long-term period, were analyzed. It was found that the material degradation had a significant effect on the welded joints. The fatigue crack propagation in welded sections showed a big difference. The rate of fatigue crack growth of degraded material for both heat affected zone and parent metal was faster than that of new material. By contrast, the result from identical materials showed that the rate of fatigue crack growth of the heat-affected zone was slower than that of parent metal.

The Evaluation of Crack Propagation in Functionally Graded Materials with Coatings (코팅 경사기능 재료의 균열전파에 관한 평가)

  • Kwon, Oh-Heon
    • Journal of the Korean Society of Safety
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    • v.23 no.4
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    • pp.25-29
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    • 2008
  • Recently, new functionally graded material(FGM) that has a spatial variation in composition and properties is developed because of its good quality. This material yields the demands for resistance to corrosion and high temperature in turbine blade, wear resistance as in gears and high strength machine parts. Especially coating treatment in FGM surface brings forth a mechanical weak at the interface due to discontinuous stress resulting from a steep material change. It often, leads cracks or spallation in a coating area around an interface. The behavior of propagation cracks in FGMs was here investigated. The interface stresses were reduced because of graded material properties. Also graded material parameter with exponential equation was founded to influence the stress intensity factor. And the resistance curve with FGM coating was slightly increased.

A Study of Fire-resistance Light-weight Inorganic Foam Material Using Cullet and Fly-ash (유리분말과 플라이애시를 사용한 내화성 경량 무기발포 소재 연구)

  • Shin, Hyeon-Uk;Song, Hun;Chu, Yong-Sik;Lee, Jong-Kyu
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2011.11a
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    • pp.79-81
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    • 2011
  • To prevent energy waste in buildings used heat insulator. Heat insulator materials can be classified inorganic and organic. The organic material is due to toxic gas emission, when a fire occurs. And it has lower water resistance. The inorganic material is heavy and worse thermal performance than organic materials. This study focused on evaluation of the physical properties and fire-resistance of inorganic foam material for using industrial by-products materials for the applicability of Fire-resistance Light-weight material.

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An Experimental Study on the Influence of Bonding Material Content Affecting on the Engineering Properties of High Strength Flowing Concrete (Part 1 experimental program and properties of fresh concrete) (고강도유동화 콘크리트의 공학적 특성에 미치는 단위결합재량의 영향에 관한 실험적 연구 (제 1보 실험계획 및 아직 굳지 않은 콘크리트의 물성))

  • 김진만;남상일;최진성;김규용;김무한
    • Proceedings of the Korea Concrete Institute Conference
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    • 1993.10a
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    • pp.29-34
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    • 1993
  • Although bonding material content of the high strength flowing concrete is very important in engineering properties, in rich mix concrete increasing the bonding material content may not follow more good properties. This study is to investigate the influence of the bonding material content affecting on the engineering properties of high strength flowing concrete, and this paper is to analyze the properties of fresh concrete. The results reveal that concrete of less bonding material content has about the same good consistency as concrete of more bonding material content, and that the evaluation methods of workability have to change in high strength flowing concrete.

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Evaluation of the Light-weight Floor Impact Sound Reduction Characteristics by Types of Resilient Material (완충재 종류에 따른 경량바닥충격음 저감특성 평가)

  • Kim, Kyoung-Woo;Yang, Kwan-Seop;Chung, Jin-Yeon;Im, Jung-Bin;Jeong, Gab-Cheol
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2008.04a
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    • pp.830-834
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    • 2008
  • Resilient materials are generally used for the floating floors to reduce the floor impact sound. Dynamic stiffness of resilient material, which has the most to do with the floor impact sound reduction. The resilient materials available in Korea include EPS (Styrofoam), recycled urethane types, EVA (Ethylene Vinylacetate) foam rubber, foam PE (Polyethylene), glass fiber & rock wool, recycled tire, foam polypropylene, compressed polyester, and other synthetic materials. In this study, we tested floor impact sound reduction characteristic to a lot of kinds of resilient material. The result of test showed that the amount of the Light-weight impact sound reduction appeared by being influenced from this dynamic stiffness of resilient material. As the decreasing dynamic stiffness of resilient material, the impact sound reduction amount is increased, especially in the low frequency domain.

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Quantitative Evaluation of Machinability of Free-Cutting Phosphor Bronze Alloy by using a Piezoelectric Tool Dynamometer

  • Cho, Hoon;Lee, Byoung-Soo;Ryu, Ho-Yeun;Jo, Hyung-Ho
    • Journal of Korea Foundry Society
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    • v.27 no.5
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    • pp.217-220
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    • 2007
  • 절삭특성은 재료를 원하는 형상으로 가공하기 위해 재료의 불필요한 부분을 제거할 경우 그 가공성이 쉽거나 어려움에 대한 정도로 전의될 수 있는데 동합금 소재의 절삭특성은 절삭시 발생된 칩의 형상이나 길이를 측정하거나 또는 공구계에 부착된 토오크 미터에 의해 절삭력을 간접적으로 측정하는 방법 등이 사용되어 오고 있다. 상기의 평가방 법은 절삭특성의 간접적인 평가방법이라는 한계와 정확도에 문제가 있는 실정이다. 본 연구에서는 압전형 공구동력계(Piezoelectric Tool Dynamometer)를 쾌삭인청동합금 피절삭물에 직접 부착하여 절삭가공시 절삭력은 정량적으로 직접 측정하고자 하였다. 쾌삭인청동합금의 소둔 열처리 시간이 증가할수록 결정립의 성장에 의한 연화현상과 납입자의 군집화(Clustering)는 관찰되었으나 그로 인한 절삭력 및 절삭에 필요한 에너지의 변화는 뚜렷하지 않았다.

The Evaluation of Fracture Toughness of SMC Composite Material and Carbon/Epoxy Composite Material (SMC 복합재료와 Carbon/Epoxy 복합재료의 파괴인성평가)

  • 최영근;이유태;이태순
    • Journal of Ocean Engineering and Technology
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    • v.7 no.1
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    • pp.25-32
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    • 1993
  • In composite materials, the fracture perpendicular to the fiber direction usually shows a non-linear behavior accompannying blunting and plastic deformation around the crack tip. In this study, the fracture thoughness in random short fiber SMC composite material and Carbon/Epoxy composite material is estimated by the A.M.(Area Method) and the G.L.M.(Generalized Locus Method) which can determine a stable total energy release rate(G$_T$) not only in highly elghly elastic material but also in highly non-linear materials.

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Mechanical Properties Evaluation of Natural and Synthetic Rubber (천연 및 합성고무의 기계적 물성 평가)

  • Park, H.S.;Woo, C.S.
    • Elastomers and Composites
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    • v.42 no.1
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    • pp.32-46
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    • 2007
  • Mechanical properties of rubber material are very important in design procedure to assure the safety and reliability of the rubber components. In this paper, the material test and accelerated heat aging test were carried out. In order to investigate the effects of heat-aging on the material properties, hardness, elongation, stress-strain curves and dynamic characteristics were obtained from various test conditions. Also, rubber material coefficients were determined by both the uniaxical and equi-biaxial tensile tests.