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- 저자 : 안용덕(Yong-Dok An) (검색결과 2 건)
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하지웅(Jiwoong Ha),허훈(Hoon Huh),박창욱(Changuk Park),안용덕(Yong-Dok An) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
Recently, interest in the laser welding to assemble components of the auto-body has increased in the automotive industry due to its productivity, efficiency and reliability. When car crash occurs, crash performance and deformation mode of the auto-body are changed according to the location and shape of laser welds. In order to understand the crash behavior of auto-body through the FE analysis, the laser welded parts should be modeled physically compatibly and simply. This paper evaluates the compatible FE modeling technique for laser welds in crash analyses. A single laser welded part in a stich shape is modeled by a group of numerous beam elements or hexahedron elements. FE analyses of cross tension test and lap-shear test under the quasi-static condition were carried out according to the number of elements, panel mesh size, and the relative position of the laser weld to the panel mesh. From the comparison between experiment and analysis results which are load and displacement curve, suitable modeling technique, which has hardly influence on analysis results, for laser welds in crash analyses is suggested.
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하지웅(Jiwoong Ha),허훈(Hoon Huh),송문종(Moon-Jong Song),안용덕(Yong-Dok An),박창욱(Changuk Park) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
This paper is concerned with the evaluation of the failure loads of the laser welding under combined axial and shear loading conditions using experiments and FE analysis. A single laser welding whose bead length was 25㎜ in a stich shape was conducted to CR340 2.0t using CO₂ laser equipped with a remote laser scanner. Quasi-static cross tension tests of the laser welding were carried out with different loading angles from 0° to 75° in order to impose the different combined loads conditions on the laser welding. Based on the experimental results, failure loads and failure behaviors of the laser welding are investigated with respect to different loading angles. Failure loads of the laser welding obtained from failure tests are interpolated to investigate failure characteristics and construct the empirical engineering failure model. Additionally, in order to evaluate the failure characteristics of the laser welding of thinner steel sheets, FE analysis of CR340 0.8t and 1.2t was carried out in the same condition of the failure test for the laser welding of CR340 2.0t.
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