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CFRP 구조 부재의 시뮬레이션 동적 거동에 관한 연구
방정민(Jung Min Bang),김정호(Jung Ho Kim),강현구(Hyun Goo Kang),김지훈(Ji Hoon Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
The structural members like transport machine are largely using shape or hollow steel member that has definite shape at present. Especially, structural members used vehicle support variously components and absorb impact energy to protect passenger when crash happen. The latest structural members are being developed in the lightest of light weight and stability because of these features. One of composite material, that is, CFRP has high specific strength and specific stiffness. It makes them attracted. In order to predict these fracture shape and energy absorb feature of CFRP members, there are many studies which are being progressed. But there are lots of differences between FEA Program and experiment. In this study, we do a impact simulation of CFRP square member using finite element analysis program Ls-Dyna in order to predict fracture shape and energy absorb feature of CFRP member. Also, we make square member shape of CFRP and do an impact experiment. After the experiment, we compare result of FEA Program with experiment result and consider fracture shape and energy absorb feature of CFRP members.
CFRP 구조 부재의 시뮬레이션 동적 거동에 관한 연구
김정호(Jung Ho Kim),방정민(Jung Min Bang),김지훈(Ji Hoon Kim) 대한기계학회 2011 大韓機械學會論文集A Vol.35 No.5
최근 수송기계 등의 구조물에 사용되는 구조부재는 대부분이 일정 형상을 지닌 형강 혹은 중공부재를 사용한다. 특히 자동차에 사용되는 구조부재는 여러 가지 부품을 지지하고, 충돌 시 충격 에너지를 흡수하여 승객을 보호하는 역할을 한다. 최근 구조부재는 이러한 특징들로 인해 경량화와 안정성을 고려하여 개발되고 있다. 본 논문에서는 CFRP 부재의 파괴 형상과 에너지 흡수특성을 예측하기 위해 CFRP 의 사각부재 형상을 만들어 충격 실험을 하고 유한요소해석 프로그램인 LS-DYNA 를 이용하여 CFRP 사각부재의 충격 시뮬레이션을 행하였다. 실험 후, FEA 프로그램의 결과와 실제 실험의 결과를 비교하여 CFRP 부재의 복잡한 파괴 거동과 에너지 흡수 특성을 고찰하였다. The structural vehicles are steel members of square or circle tube with definite shape. These members support various components and absorb impact energy to protect passengers during accidentswhen crash happen. Structural members need to be lightweight and stable. In this study, we do an impact simulation of a CFRP square member using finite element analysis program Ls-Dyna in order to predict fracture shape and energy absorb feature of CFRP member. Also, we make square member shape of CFRP and do an impact experiment. We compare the analytical and experimental results and consider the fracture shape and energy features of CFRP members.
적층각이 CFRP/Al 혼성 박육부재의 굽힘에 미치는 영향
김지훈(Ji-Hoon Kim),정주영(Joo-Yeong Joeng),방정민(Jung-Min Bang) 한국자동차공학회 2009 한국자동차공학회 지부 학술대회 논문집 Vol.2009 No.10
The material property of CFRP structural member which is made by unidirectional prep reg is determined by stack-ing angle and sequence. And understanding characteristics of CFRP structural members according by stacking angle and sequence are important to apply structures. In this study, 3 point bending test had been experimented on square CFRP structural members which are made by unidirectional prepreg, as the basic shape for structural members and, also, hybrid structural members which are used aluminum to compensate the brittle characteristic compared with square CFRP structural members.
可視距離와 晝光率을 고려한 講議室 規模算定에 關한 硏究
李商雨,方正民 경기대학교부설 산업기술종합연구소 1985 산업기술종합연구소 논문집 Vol.1 No.-
This study aims to provide optimun size of Lecture room through experiment of sight distance by identification and daylighting performance. The qualitative evaluation of this distance and performance has been examined, and the result of this are as followed. The maximum depth of Lecture room is 7.5m and maximum lenght of this is 12.8m. So the maximum allowable capacity of Lecture room are 80 persons. Further study in relation to subjective evaluation have been discussed more than 80 persons.
李商雨,方正民 경기대학교부설 산업기술종합연구소 1985 산업기술종합연구소 논문집 Vol.1 No.-
Recently Pressure-grouting Method is used widely in building constructions, but the level of technique of this is not high than the others using in foundation construction. Grouting method has many problems in application, foundation designs because of the poor load-bearing capacity of soils. This paper aims to put mixture using in grouting to practical use and construct more economical buildings through making experiment of mixtures using in construction field.