http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
김동범,추연근,조해용,Kim, Dongbum,Qiu, Yuangen,Cho, Hae-Yong 대한용접접합학회 2015 대한용접·접합학회지 Vol.33 No.3
Self-piercing riveting is an joining method of advanced high strength steels (AHSS) and other dissimilar materials. It has attracted considerable interest from the automotive industry. The SPR has become an interesting alternative joining technique for difficult to weld materials such as steels and aluminium alloys. In this paper, self-piercing rivet and anvil for SPR were designed for the joining conditions with AHSS and aluminium alloy. Various conditions of SPR were simulated for the design of rivets and anvils. The simulated results were in good agreement with experimental ones. As a result, over HV500 rivet is desirable to joint SPFC780 AHSS and aluminum alloy.
샌드위치 패널 (대형물류)창고 실태조사를 통한 화재 시 건축적 대응 방안 기초연구
김동범(Kim, Dongbum),장주환(Jang, Joohwan) 한국방재학회 2017 한국방재학회논문집 Vol.17 No.1
최근 샌드위치 패널이 적용된 대형물류창고에서 화재가 빈번하게 발생하고 있으며, 물류창고는 적재물의 종류와 규모에 따라 화재하중이 크고, 조기 소화활동이 어려워 건축물 붕괴로 인한 인명과 재산 피해규모가 큰 것으로 조사되었다. 또한, 물류창고는 공기단축, 경제성, 시공성 등의 이유로 철골조시스템, 샌드위치패널 등 화재에 취약한 재료로 시공하는 경우가 많아 화재 시 피해가 큰 경향을 보인다. 이와 같이, 화재 시 건물붕괴 및 인명피해 저감을 위해서는 화재에 취약한 철골구조는 내화피복을 의무화하고, 샌드위치 패널은 불연재 또는 준불연재나 난연재 패널 사용을 의무화하기 위한 소방법 기준강화를 통한 건축구조 및 재료 측면에서의 연구가 필요하다. 따라서 본 연구에서는 국내 대형물류창고의 현장 실태조사를 통해 적재물에 따른 건축 구조적 특성을 파악하고, 이를 기반으로 화재 하중에 따른 위험등급 측면에서의 소화활동 시 피해를 최소화하기 위한 건축적 대응 방안으로 피난 개구부 크기 및 위치와 구조적 특성을 파악하기 위한 연구를 수행하였다. Recently, Fire accidents of the warehouse are occurred frequently and has huge damaged such a collapse. Warehouse can be many different sizes depending on the type of commodities and It is often hard to extinguish the fire. In case of fire, Warehouse tend to have a huge damage by using steel frame structure and sandwich panel which are weak in fire for shorten the construction period, economy and constructability. And More research on construction structure and material performance that strengthen standard of fire resistive covering and use non-combustible panel is needed to improve using steel frame structure and sandwich panel for reducing risk of collapse and the casualties caused by fire. To propose an architectural countermeasures of construction structure in the classification of commodity, the construction structural characteristic and evacuation door of warehouse are analyzed through the field survey.
김동범(Dongbum Kim),이인환(In Hwan Lee),조해용(Hae Yong Cho) 대한기계학회 2015 大韓機械學會論文集A Vol.39 No.8
적층조형(additive manufacturing, AM)은 액체, 고체 상태인 폴리머, 금속 등의 재료를 층층이 쌓아서 3 차원 형상을 제조하는 기술이다. AM 기술은 제품 개발 초기단계에서 시제품 제작에 주로 사용되었으나, 최근 들어 이를 실제 제품제작에 적용하는 것에 대한 관심이 높아지고 있다. 한편 AM 기술에서 적층방향은 최종성형품의 기계적 물성에 영향을 줄 수 있다. 따라서 본 연구에서는 폴리머 재료를 사용하는 대표적인 AM 기술인 FDM, PolyJet 그리고 SLA 방식으로 제작되는 재료의 기계적 물성을 실험을 통해 파악하여 보았다. 이때 시험편의 형상은 ASTM D 638 을 참고하였고 적층방향을 달리하여 성형하였다. 시험편의 인장시험으로부터 얻은 응력?변형률 선도를 바탕으로 기계적 물성을 조사하였다. 또한 시험편의 파단부를 SEM 촬영하여 물성차이의 결과를 분석하였다. Traditionally, additive manufacturing (AM) technology has been used to fabricate prototypes in the early development phase of a product. This technology is being applied to release manufacturing of a product because of its low cost and fast fabrication. AM technology is a process of joining materials to fabricate a product from the 3D CAD data in a layer-by-layer manner. The orientation of a layer during manufacturing can affect the mechanical properties of the product because of its anisotropy. In this paper, tensile testing of polymer-based specimens were built with a typical AM process (FDM, PolyJet and SLA) to study the mechanical properties of the AM materials. The ASTM D 638 tensile testing standard was followed for building the specimens. The mechanical properties of the specimens were determined on the basis of stress?strain curves formed by tensile tests. In addition, the fracture surfaces of the specimens were observed by SEM to analyze the results.
김동범(Dongbum Kim),곽병정(Byoungjung Kwak),김연옥(Yeon-ohk Kim),오용철(Yongchul Oh),이재영(Jaeyoung Lee) 한국정보과학회 2002 한국정보과학회 학술발표논문집 Vol.29 No.2Ⅲ
인터넷상에서의 정보검색은 검색엔진을 이용하여 이루어지는데, 방대한 사이트들을 검색하여야 하므로 검색효율이나 검색된 정보의 유용성에 문제가 있게 된다. 만약 이러한 정보들을 미리 자동적으로 검색, 분류해서 저장한다면 위의 두 가지 문제들을 해결할 수 있을 것이다. 자동적으로 이런 일을 처리하도록 고안된 것이 웹 로봇 에이전트라고 하며 현재 국내에도 여러 개의 웹 로봇 에이전트를 이용한 검색엔진이 사용되고 있다. 본 논문에서는 검색엔진을 구현하기 위해 하이퍼텍스트 전송규약에 대한 연구와 웹 로봇 에이전트에 대한 연구를 하여 올바른 로봇 에이전트를 구현하여, 구현된 검색엔진을 통한 효율적인 정보검색을 실현하는데 목적이 있다.
초고장력강과 알루미늄 합금의 판재 접합을 위한 헬리컬 SPR 설계
김동범(Dongbum Kim),김관우(Kwan-Woo Kim),조해용(Hae-Yong Cho) 대한용접·접합학회 2015 대한용접·접합학회지 Vol.33 No.6
Self-piercing riveting (SPR) is a sheet-joining method that can be used for materials that are difficult or unsuitable for weld, such as aluminum alloys and other steel sheet metals. The increased application of lightweight materials has initiated many investigations into new SPR conditions for riveting dissimilar materials. However, buckling of the semi-tubular rivet occurs during the riveting of AHSS. In this study, a helical SPR was designed for the riveting of AHSS and Al-alloy. In addition, the reinforced helical SPR which has straight parts was designed. The riveting of AHSS and Al-alloy was simulated. Simulated results were verified by comparison with experimental ones.
유리섬유 강화 플라스틱과 알루미늄 합금 접합을 위한 유한요소해석
조해용,김동범,Cho, Hae-Yong,Kim, Dongbum 대한용접접합학회 2015 대한용접·접합학회지 Vol.33 No.2
Self-piercing rivet(SPR) is mechanical joining methods and which can be joining dissimilar materials. Unlike conventional riveting, SPR also needs no pre-drilled holes. During plastically deformation, SPR pierces upper sheet and joins it to under sheet. SPR has been mainly applied to the joining the automobile body and some materials, such as glass fiber reinforced polymer and aluminum alloy, which represent the sheet-formed materials for lightweight automobile. Glass fiber reinforced plastic(GFRP) has been considered as a partial application of the automobile body which is lighter than steels and stronger than aluminium alloys. It is needed SPR to join Al alloy sheets and GFRP ones. In this paper, in order to design the rivet and anvil, which are suitable for GFRP, the joinability was examined through simulations of SPR joining between GFRP and Al alloy sheets. For this study, AutoCAD was used for the modeling and the simulated using commercial FEM code DEFORM-2D. The simulated results for SPR process joining between GFRP and Al alloys were confirmed by the same conditions as experimental trials.
분리형 섕크를 갖는 SPR의 형상 설계를 위한 유한요소해석
김관우(Kwan-Woo Kim),김동범(Dongbum Kim),조해용(Hae-Yong Cho) 대한용접·접합학회 2016 대한용접·접합학회지 Vol.34 No.2
SPR(Self-Piercing rivet) is mechanical element of joining sheet metal components without the need for pre-punched or pre-drilled holes. Newly designed SPR is developed for high joining strength and shearing strength than semi-tubular rivet. In this study, divided shank of self-piercing rivet were designed for joining DP440 and SILAFONT. Newly designed SPR was simulated by using FEM code DEFORM-3D. In simulations of SPR process, various shape of self-piercing rivet were considered for semi-tubular and newly designed SPR. In other to examine the joinability, joining load and lap-shear load of newly designed SPR were compared with semi-tubular by simulated results and experimental ones.