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[특별세션]DIC 액압벌지실험을 이용한 순 티타늄 판재의 소성유동곡선에 관한 연구
김진재(Jinjae Kim),김영석(Youngsuk Kim),권성진(Seongjin Kwon) 한국자동차공학회 2016 한국자동차공학회 부문종합 학술대회 Vol.2016 No.5
In this paper, the plastic flow curve of commercially pure titanium sheet (CP Ti) has been evaluated using Tensile test and Hydraulic bulge test. The plastic flow curve known as hardening curve is a key on factor needed in conducting finite element analysis for the forming process of sheet material. However, several sheet forming processes lead to the large plastic deformation of which the plastic strain is over the maximum uniform elongation of uniaxial tensile test, for instance, clinch forming, hydroforming, stamping and deep drawing. Therefore, we have performed tensile and a hydraulic bulge test for CP Ti sheet. We also have used and evaluated three method that convert from hydraulic bulge flow curve to tensile flow curve. The measured true flow curve from the hydraulic bulge test can be fitted well by the hardening equation known as Kim-Tuan model.
Analyzing Research Trends in Marine Sport Industry and Future Directions
( Daehwan Kim ),( Jinjae Kim ),( Byungjae Min ),( Yunkyung Jeon ),( Huang Yihan ) 한국체육학회 2021 International journal of human movement science Vol.15 No.2
The purpose of the present study was to analyze research articles on marine sports depending on research time period, research types, research topics, and research methods and to discuss future research directions in the field of marine sports based on the analysis. The current study collected 338 research articles related to marine sport, which were published in domestic academic journals from 2012 to 2021. Bibliometric analysis was performed to analyze the collected research articles. The major results were as follows. First, the overall temporal trend of publications indicated linear increase. Second, the majority of research was conducted by a single or two authors in marine sport research. Third, with respect to research type trends, the present study found that descriptive research took the greatest portion of research types. Meanwhile, researchers tend to rely on regression analysis, structural equations modeling (SEM), and analysis of variance to test their research hypotheses. In terms of research tier trends, the present study found that the majority of research had been published in academic journals indexed by Korean Citation Index (KCI). The results of analysis of research areas indicated that the number of publications in humanities and social sciences was greater the one in sport sciences. Lastly, the current study found that the majority of research pay tremendous attention to the topics of overall marine sport industry rather than specific marine sport activities. Based on the discussion on the results, several future directions for marine sport research were suggested.