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핫스탬핑 공법을 적용한 승용차 후방충돌 성능개선에 관한 연구
장종민(Jongmin Jang),김윤규(Yungyu Kim),문만빈(Manbin Moon) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
Recently, automotive industry has applied to increase strength and decrease weight, cost and part number. A hot stamping process has been implemented to increase the strength of passenger car body parts and to reduce not only the weight of parts but also the number of work process. This paper is concerned with the crash analysis of Rear module model in order to compare the effectiveness between hot stamping model and conventional model.
하이드로포밍 공법을 적용한 승용차량 어퍼 암 성형성 평가
장종민(Jongmin Jang),성경진(Kyunggin Sung),김윤규(Yungyu Kim),문만빈(Manbin Moon) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.3
Recently, automotive industry has applied to increase strength and decrease weight, cost and part number. The Hydroforming technology has recognized general technique in manufacture industry. This paper shows that formability estimation of hydro forming upper arm is performed using Finite Element Analysis and results obtained from simulation for a upper arm in hydroforming process are compared with a series of experiments.
김석봉(Seokbong Kim),허훈(Hoon Huh),김대온(Daeon Kim),문만빈(Manbin Moon) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
An important challenging issue in the automotive industry is the light-weight, safe design and enhancement of crash response of an auto-body structures. These objectives lead to increasing adoption of high strength steel sheet for inner and outer auto-body members. This study evaluates the dynamic tensile characteristics of high strength steel sheets, HS45R, TRIP60, DP60 and DP100, along the rolling direction and transverse direction. Static tensile tests were carried out at the strain rate of 0.003/sec using the static tensile machine (Instron 5583). Dynamic tensile tests were carried out at the range of strain rate from 0.1/sec to 200/sec using a high speed material testing machine developed. The tensile tests acquire stress-strain relation and strain rate sensitivity of each material. The experimental results show two important aspects for high strength steels: the flow stress is increased as strain rate increases; the strain hardening is decreased as the tensile stress increases. The experiments also produce interesting results that the elongation is not decreased even when the strain rate increases.