Proceedings of the KSME Conference (대한기계학회:학술대회논문집)
- 2001.06a
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- Pages.945-950
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- 2001
Parameter Study for the Analysis of Impact Characteristics considering Dynamic Material Properties
동적 물성치를 고려한 V.I. 충격인자의 영향 분석
- Lim, J.H. (KAIST) ;
- Song, J.H. (KAIST) ;
- Huh, H. (KAIST) ;
- Park, W.J. ;
- Oh, I.S. ;
- Choe, J.W.
- 임지호 (한국과학기술원 기계공학과) ;
- 송정한 (한국과학기술원 기계공학과) ;
- 허훈 (한국과학기술원 기계공학과) ;
- 박우진 (LG산전 전력연구소) ;
- 오일성 (LG산전 전력연구소) ;
- 최종웅 (LG산전 전력연구소)
- Published : 2001.06.27
Abstract
Vacuum interrupters that is used in various switchgear components such as circuit breakers, distribution switches, contactors, etc. spreads the arc uniformly over the surface of the contacts. The electrode of vacuum interrupters is used sintered Cu-Cr material satisfied with good electrical and mechanical characteristics. Because the closing velocity is 1-3m/s, the deformation of the material of electrodes depends on the strain rate and the dynamic behavior of the sintered Cu-Cr material is a key to investigate the impact characteristics of the electrodes. The dynamic response of the material at the high strain-rate is obtained from the split Hopkinson pressure bar test using cylinder type specimens. Experimental results from both quasi-static and dynamic compressive tests with the split Hopkinson pressure bar apparatus are interpolated to construct the Johnson-Cook equation as the constitutive relation that should be applied to simulation of the dynamic behavior of electrodes. To evaluate impact characteristic of a vacuum interrupter, simulation is carried out with five parameters such as initial velocity, added mass of a movable electrode, wipe spring constant, initial offset of a wipe spring and virtual fixed spring constant.
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