샌드위치 패널심재로 활용을 위한 VA/VeoVa 개질 다공성 경량골재 콘크리트의 특성

노정식,문경주,소양섭 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)

Sandwich panel made by foamed styrene and polyurethane has been used generally in the construction area because of the high thermal conductivity and light weight. But, They occur harmful gases to both bodies and environments in the high temperature over 50℃. So, the purpose of this study is to investigate the physical properties of light-weight panel using the non-structural lightweight aggregate as a part of the substitution of foamed styrene and polymer-cement ratio as 5, 10, 15% and the filling ratio of continuous void as 50, 60% on the strength of polymer-modified sandwich panel core. From the result, we could know that the compressive and flexural strength of the sandwich panel core using non- structural lightweight aggregate and polymer dispersion such as SBR, St/BA-1 and St/BA-2 tended to be increased with an increase in the polymer-cement ratio and the filling ratio of continuous void.

Research Trends in Polymer Materials for Use in Lightweight Vehicles

류민영,최태균 한국정밀공학회 2015 International Journal of Precision Engineering and Vol. No.

Weight reduction of vehicle is very important because vehicle weight directly affects energy consumption. Studies researchinglightweight vehicle manufacturing process that use polymers are reviewed in this paper. Approaches reducing the weights of vehiclesusing polymers most frequently involve replacing ferrous and non-ferrous metals with polymers and increasing the specific strengthsand rigidities of polymers. Researches into polymers for use in lightweight vehicle are classified into high performance polymers,polymers for weight reduction, reinforced polymer composites, polymer sandwich panels, and polymer/metal hybrid systems. A diverserange of polymer materials can be used to make vehicle components and the manufacturing methods required to produce and workthose materials vary greatly. Shaping processes must be chosen according to the materials being used and the product design. Replacement of metal products with polymer materials in current vehicles is limited. Large amounts of lightweight materials, suchas polymers, will be greatly used to construct newly developed vehicles, including electric and electric/hybrid vehicles.

유리섬유보강 폴리머 복합패널의 피로특성 : Fatigue Properties of Glass Fiber Reinforced Polymer Composite Panel

연규석,정중호,권택정,김성기 강원대학교 부설 석재복합신소재 제품연구센터 2004 석재연 논문집 Vol.9 No.-

본 연구는 압축강도 1,020 kgf/㎠를 갖는 폴리머 모르타르를 중심부로 하고 내·외표면은 고인장의 GF RP로 보강된 샌드위치 패널의 피로 특성에 관한 연구이다. 이를 위해 중심부 폴리머 모르타르와 압축 및 인장측 GERP보강층 두께를 달리하는 샌드위치 형식의 패널 시험체를 제작하고 이에 대한 휨 피로 시험을 수행함으로써 폴리머 모르타르 두께와 GFRP보강층 두께가 패널의 휨피로거동에 미치는 영향 즉 피로하중수준-피로수명과의 상관관계를 구명하였다. 실험결과 하중수준이 증가함에 폴리머 모르타르 및 GFRP 보강두께에 관계없이 샌드위치 패널의 피로수명은 감소하는 경향을 나타냈고, 동일 하중수준에서는 폴리머 모르타르 두께가 증가함에 따라 피로수명은 감소하는 경향을 나타냈으며, GFRP 보강층 두께가 증가함에 따라 피로수명이 증가하는 경향을 나타냈다. 한편 이러한 폴리머 모르타르 및 GFRP 보강층 두께에 따른 피로응력수준-피로수명 상관관계는 수정된 Miner의 법칙과 부합됨을 확인 할 수 있었다. Is this study, the fatigue properties of the sandwich panel of which core was made of the polymer mortar and inner and outer facings were reinforced by a high-tensile GFRP were surveyed. Sandwich-panel specimens consisted of polymer mortar core and GFRP compressive and tensile sides with various thickness were produced for the experimental study. Flexural fatigue tests were conducted to figure out the correlation between fatigue load and fatigue life for various thickness of core and facings, and its results are presented. The correlation obtained in this study between fatigue load and fatigue life for various thickness are in good agreement with the modified Miner's law.

알루미늄-폴리머 복합 샌드위치 판재의 계면 잔류응력 계산을 통한 설계 기술 개발

김기주(Kee Joo Kim) 대한기계학회 2019 大韓機械學會論文集A Vol.43 No.10

섬유 강화 복합 판재의 유동응력은 등방성 가설을 기초로 쉽게 설명될 수 있다. 그러나 샌드위치 판재의 거동은 등방성 재료처럼 간단하지 않다. 이것은 구성 재료의 소성이방성이 이들 샌드위치 판재의 구성층에서 가로방향의 응력을 생성하기 때문이다. 그러므로 샌드위치 판재의 구성 응력을 단순 계산하는데 편리한 혼합 법칙은 가로응력이 세로응력에 비해서 무시할 정도로 작을 경우에 적용할 수 있다. 그러나 정확하게는 샌드위치 판재의 다른 구성층에 발생하는 인장 가로응력과 압축 가로응력 때문에 인장응력의 증감이 발생한다. 이 혼합 법칙을 사용하여 항복 강도, 인장 강도 및 연신율과 같은 샌드위치형 복합 시트의 다양한 인장 특성은 구성 재료의 인장 특성 및 부피분율에 의해 표현될 수 있다. 따라서 본 연구에서는 샌드위치형 복합 판재의 유동응력에 대한 혼합 법칙 및 다양한 인장 특성에 대해 고찰하였다. The flow stress of fiber-reinforced composite plates can be easily understood based on the isotropic hypothesis. However, the behavior of sandwich plates is not as simple as isotropic materials. This is because the different plastic anisotropy of constituent materials creates transverse stresses in these constituent layers. Therefore, the sandwich-plate mixing rule is frequently applied because the transverse stress is negligibly smaller than the longitudinal stress. However, because of the tensile transverse stress and compressive transverse stress on the other constituent layers, the increase and decrease of the tensile stress is due to the cancellation effect. By using this mixing law, various tensile properties of sandwich-type composite sheets, such as yield strength, tensile strength, and elongation, can be expressed by the tensile properties and volume fraction of constituent materials. In this study, the mixing law and various tensile properties of the flow stress of sandwich-type composite plates are discussed.

파형 유리섬유복합체 전단연결재로 보강된 중단열 벽체의 면내전단거동

장석준(Jang, Seok-Joon),김호룡(Kim, Ho-Ryong),유영찬(You, Young-Chan),윤현도(Yun, Hyun-Do) 대한건축학회 2014 大韓建築學會論文集 : 構造系 Vol.30 No.3

This paper describes the test results on in-plane shear responses of insulated concrete sandwich wall panels (CSWP) with corrugated glass fiber-reinforced polymer (GFRP) shear connector. The insulated CSWP are commonly consisted of two walls of concrete separated by a layer of rigid foam insulation and shear connectors used to provide integrity between the interior and exterior concrete wall panels. Each insulated CSWP specimens were tested under push-out loading, with bottom surfaces of the outer two concrete walls supported vertically, and a gap under the bottom surface of the middle concrete wall. In this study, type of insulation [expanded polystyrene(EPS) and extruded polystyrene with surface treatment(XPSS)], casting method (horizontal and vertical casting of concrete) and reinforcement cross-section of shear connector were considered as principal variables. And four types of corrugated shear connector with different width and pitch were used for insulated CSWP. The load versus relative slip response of the insulated CSWP has been established through push-out shear test. Test results indicate that insulated CSWP specimens with XPSS insulation show higher shear capacity than those with EPS insulation due to the relatively high surface roughness of XPSS insulation and vertical method of casting higher shear capacity than horizontal method. It was also shown that interfacial bonding between insulation and concrete walls has a significant effect on the in-plane shear resistance prior to GFRP connector’s working. In-plane shear capacity of insulated CSWP increased with increasing cross-sectional area of shear connector.

4변이 단순지지된 폴리머 모프터 샌드위치 패널의 구조적 거동

연규석,김광우,김기성,황진용 한국콘크리트학회 1993 콘크리트학회지 Vol.5 No.1

본 연구에서는 표면부를 에폭시 폴리머 모르터로 하고 , 중심부를 발포 폴리스티렌으로 하는샌드위치 패널을 제조하여, 표면부를 용접철강으로 보강한 경우와 보강하지 않은 경우에 대하여 4강 단순지지 조건에서의 정적 차 통해 하중-처짐, 휨모멘트-변형률, 파괴양상 등을 구명하였다. 단위중량, 극한가중, 휨모멘트는 중심부의 두께보다 표면부 두께에 더 큰 영향을 받으며 극한처짐은 보강안된 경우 표면부 보다 중심부 두께의 영향이 월등히 컸으마 보당된 경우는 표면부나 중심부 두께의 영향이 비슷하였다. 그러나 용접철망의 보강은 샌드위치 패널의 처짐억제 보다 인성증가에 기여도가 높은 것으로 나타났다. 샌드위치 패널의 파괴양상은 보강하지 않은 경우 선형파괴가 일어난데 비해 보강한 경우에는 방사상의 파괴가 일어났다.

유리섬유보강 폴리머 복합체 개발

신영수,연규석,최종윤 강원대학교 부설 석재복합신소재 제품연구센터 2002 석재연 논문집 Vol.7 No.-

본 연구에서는 중심부를 MMA 개질 폴리머 모르타르로 하고 양표면부를 고인장, 고내구성인 GFRP (Glass Fiber Reinforced Plastics)로 보강하여 샌드위치를 제작하고, 이에 대한 단순 휨시험을 실시하여 GFRP 보강 MMA 개질 폴리머 모르타르 샌드위치패널의 단면결정시 필요한 설계 휨 모멘트의 산정을 위한 기초적인 자료로 제공코저 한다. 그 결과 중심부 MMA개질 폴리머 모르타르의 두께에 관계없이 압축 및 인장 GFRP 보강층 두께가 0에서 1.50∼2.76mm로 증가함에 따라 휨강도는 2.3∼5.6, 변형에너지는 40∼70배 보강효과를 나타내었다. 이것은 얇은 두께를 갖는 휨부재의 보강에 철근 또는 메쉬를 사용하는 것 보다 양표면부를 GFRP로 보강하는 것이 현저한 보강효과가 있음을 보여주는 결과이다. In this study, a MMA modified polymer mortar sandwich panels was developed : Core was made of the MMA polymer modified mortar, compressive strength of which was about 1020 kgf/㎠, and both facing were made of the glass fiber reinforced plastics (GFRP). The result showed that the strain energies increased 23-33 times as the thicknesses of facings increased from 1.50 to 2.76mm with fixing the core thickness to constants (30-50 mm). On the other hand, these values showed a tendency of decreases as the core thickness increases regardless of thickness of facings. A set of basic data for the structural analysis could be provided by investigating the correlations, within the scope of this research, between the resisting moment and the thicknesses of core and facing.

샌드위치패널심재로 활용한 St/BA 개질 다공성 경량 콘크리트의 특성

강내민 ( Nae Min Kang ),노정식 ( Jung Sik Roh ),도정윤 ( Jeong Yun Do ),문경주 ( Kyung Ju Mun ),소양섭 ( Yang Seob Soh ) 한국건축시공학회 2003 한국건축시공학회 학술발표대회 논문집 Vol.3 No.1

Sandwich panel is composed of the facing sheets which support the external load, the cellular core with the low thermal conductivity and the adhesive agent to bond them. The cellular core was produced by binding lightweight cellular aggregates with cement and two types of acrylic base St/BA emulsion were added with a view to improving the workability loss due to high absorption of light weight aggregate and to develope more strength, respectively. This investigation is to comprehend the effect of the addition of two types of St/BA on thermal conductivity, calorific value and exhaustion content of noxious gas in addition to compressive and flexural strength. Flexural strength of the specimen made with St/BA-2 ranged 20kgf/cm2 to 25kgf/cm2 and was about 50% to 100% as high as that of the non-fiber specimen. Thermal conductivity was recorded from 2.0 to 3.0 kcal/mh℃ and calorific value of St/BA modified specimen was much lower than that of commercial sandwich panel core of EPS and urethane. Careful caution has to be taken because generation of noxious gas such as CO, NO and SO2 tend to increase with addition of polymer cement ratio.

유리섬유복합체를 사용한 전단연결재 형상에 따른 중단열 벽체의 면내전단내력

장석준,유영찬,김호룡,윤현도 한국구조물진단유지관리공학회 2013 한국구조물진단유지관리공학회 논문집 Vol.17 No.4

This paper describes an experimental program to investigate the shear behavior of insulated concrete sandwich panels (CSPs) with different types of GFRP shear connector. The study included testing of 13 insulated CSP specimens with two types of surface conditions for extruded polystyrene (XPS) insulation and various shapes of shear connectors. All specimens were loaded in direct shear by means of push-out and were consist of three concrete panels, two insulation layer and four rows of GFRP shear connectors. Load-relative slip between concrete panel and insulation response of CSP specimens has been established through push-out shear test. Test results indicate that the surface condition of insulation has a significant effect on the bond strength between concrete panel and insulation. The specimen used XPS foam with 10mm deep slot shows higher bond strength than those used XPS foam with meshed surface. Corrugated GFRP shear connectors show equivalent strength to grid GFRP shear connectors. Cross-sectional area and embedded length of shear connector have a notable effect on overall response and inplane shear strength of the CSP specimens.

단면이 두꺼운 GFRP 보강 폴리머 모르타르 샌드위치 패널의 변형특성

연규석,김남길,최종윤,백종만 강원대학교 부설 석재복합신소재 제품연구센터 2003 석재연 논문집 Vol.8 No.-

본 연구는 압축강도 840kgf/㎠를 갖는 폴리머 모르타르를 중심부로 하고 내ㆍ외표면은 고인장의 GFRP로 보강된 샌드위치 패널의 휨 거동에 관한 것으로 중심부 폴리머 모르타르 두께와 내ㆍ외면의 GFRP층 두께를 변수로 하였다. 실험결과, 폴리머 모르타르 두께가 2~36min의 범위에서 보강층 두께가 0.6에서 3mm로 증가함에 따라 변형에너지 및 연성지수는 각각, 16~340배, 2~8배로 현저히 증가하였다. 한편 폴리머 모르타르 두께가 두꺼울수록 증가비율은 감소하는 경향을 나타냈다. In this study, a polymer mortar sandwich panel(PMSP) was developed : Core was made with the polymer mortar whose compressive strength was about U kgf/㎠, and both facings were made with the glass fiber reinforced plastics(GFRP). The results showed that the strain energies and the ductility indices increased 16-340 times and 2-8 times, respectively, as the thicknesses of facings increased from 0.6 to 3.Omm with fixing the core thickness to constants(12-36mm). On the other hand, these values showed a tendency of decrease as the core thickness increased regardless of thickness of facings. A set of basic data for the structural analysis could be provided by investigating the correlations, within the scope of this research, between the resisting moment and the thicknesses of core and facings.