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격자법을 이용한 자동차용 플라스틱의 진응력-변형률 선도 도출
박충희(Chunghee Park),김진성(Jinsung Kim),허훈(Hoon Huh),안창남(Changnam Ahn),최석진(Seokjin Choi) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
The plastics are widely utilized in the inside of vehicles. The dynamic tensile characteristics of auto-body plastics are important in a prediction of deformation mode of the plastic component which undergoes the high speed deformation during car crash. This paper is concerned with the dynamic tensile characteristics of the auto-body plastics at intermediate strain rates. Quasi-static tensile tests were carried out at the strain rate ranged from 0.001/sec to 0.1/sec using the static tensile machine (Instron 5583). Dynamic tensile tests were carried out at the strain rate ranged from 1/sec to 100/sec using the high speed material testing machine developed. Conventional extensometry method is no longer available for plastics, since the deformation of plastic is accompanied with localized deformation. In this paper, quasi-static and dynamic tensile tests were performed using ASTM Ⅳ standard specimens with grids and images from a high speed camera were analyzed for strain measurement. True stress-strain relations and the strain rates at each deformation step were obtained by processing load data and deformation images, assuming the plastics to deform uniformly in each grid.
하중평형 격자법을 이용한 자동차용 플라스틱의 진응력-진변형률 선도의 개선
박충희(Chunghee Park),김진성(Jinsung Kim),허훈(Hoon Huh),안창남(Changnam Ahn),최석진(Seokjin Choi) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
This paper is concerned with the tensile characteristics of auto-body plastics at strain rates ranging from 0.001/sec to 100/sec. The tensile characteristics at high strain rates are important in prediction of deformation modes of the plastic components which undergo the high-speed deformation during car crash. Uniaxial tensile tests at the quasi-static strain rate were conducted at strain rates ranging from 0.001/sec to 0.01/sec by using a tensile testing machine (INTRON 5583). Uniaxial tensile tests at the intermediate strain rate were conducted at strain rates ranging from 0.1/sec to 100/sec by using a high-speed material testing machine developed. Since the deformation of the plastics is accompanied with localized deformation and a conventional extensometry method(CEM) is no longer valid for strain measurement, a force equilibrium grid method(FEGM) is newly proposed in order to acquire accurate true stress-true strain curves of the plastics. FEGM is utilized with image capture of non-uniform distribution of deformation at each elongation stage from a high speed camera in aids of grid methods. The true stress-true strain relations at the designated true strain rate and increment were obtained by collecting the load data by the equilibrium and the deformation images.