대한기계학회논문집A (Transactions of the Korean Society of Mechanical Engineers A)

  • 제27권6호
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  • Pages.1034-1040
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  • 2003
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  • 1226-4873(pISSN)
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  • 2288-5226(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
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크리프에 따른 CRT 텐션 마스크의 장력 이완

Creep-Induced Tension Loosening of CRT Tension Mask

  • 정일섭 (영남대학교 기계공학부)
  • 발행 : 2003.06.01
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초록

Tension mask is a part of CRT type devices, which is installed right behind glass-made front panel. Numerous slits on the thin metal sheet enable the electron beams emitted from posterior gun to be focused, resulting in enhanced definition. Flattened and enlarged displays necessitate the imposition of pretension on the masks, in order to improve the robustness of display quality against vibration or impact. High temperature assembly process subsequent to pretensioning, however, degenerates creep resistance of mask material, and common mask may become susceptible to undesirable elongation due to creep. Once tensile stress becomes high enough to induce creep deformation, pretension is substantially loosened. In this study, tension mask assembly is modeled as a combined structure of beams and wire array, and a numerical simulation is attempted for pretensioning followed by high temperature process. Based on a model study, creep occurrence is found to be probable and its adverse influence is quantified. As fur maintaining high tensile force, simply increasing pretension does not seem to be helpful. Instead, the structure of frame needs to be modified somehow, or material for mask needs to be selected properly.

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참고문헌

  1. O'Donnell, W.J. and Porowski, J., 1973, 'Yield Surfaces for Perforated Materials, ' Trans. of ASME J. of Applied Mechanics, Vol. 40, pp. 263-270 https://doi.org/10.1115/1.3422938
  2. Baik,S.C., Oh,K.H., and Lee,D.N., 1996, 'Analysis of the Deformation of a Perforated Sheet under Uni-axial Tension,' J. of Materials Processing Technology, Vol. 58, No.1, pp. 139-144 https://doi.org/10.1016/0924-0136(95)02096-9
  3. Baik,S.C., Han,H.N., Lee,S.H., Oh,K.H., and Lee,D. N., 1997, 'Plastic Behavior of Perforated Sheets under Biaxial Stress State,' Int. J. of Mechanical Sciences, Vol. 39, No.7, pp. 781-793 https://doi.org/10.1016/S0020-7403(96)00091-4
  4. Baik,S.C., Han,H.N., Lee,S.H., Oh,K.H., and Lee,D. N., 2000, 'Plastic Behavior of Perforated Sheets with Slot-type Holes under Biaxial Stress State,' Int. J. of Mechanical Sciences, Vol. 42, pp. 523-536 https://doi.org/10.1016/S0020-7403(99)00007-7
  5. Moon,Y.H., Lee,D.W., Yang,D.Y., Won,I.S., and Kim,D.H., 1993, 'Study on the Warm Press Forming Processes for Perforated Sheet Metal,' Proc. of KSPE, Spring Annual Meeting, pp. 38-43
  6. Son,S.S., 1997, 'Thermal Deformation Characteristics in Manufacturing Process of Shadow Mask, ' M.S. Thesis, Pusan National University
  7. Kim,K.W, Kim,N.W, and Kang,D.J., 1998, 'Analysis of Shadow Mask Thermal Deformation and Prediction of Beam Landing Shifts for Color CRT,' IEEE Trans. on Consummer Electronics, Vol. 44, No.2, pp. 442-450 https://doi.org/10.1109/30.681963
  8. Park,S.K., Kim,J., Chang,Y.C., and Kang,B.S., 2001, 'Analysis of the Deformation of a Perforated Sheet under Thermal and Tension Load Using Finite Element Method,' J. of Materials Processing Technology, Vol. 113, pp. 761-765 https://doi.org/10.1016/S0924-0136(01)00696-3
  9. Kraus,H., 1980, Creep Analysis, John Wiley & Sons, New York, pp. 18-27
  10. Callister, Jr., WD., 2000, Materials Science and Engineering An Introduction, John Wiley & Sons, New York, pp. 118-121