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

  • 제30권11호
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  • Pages.1425-1432
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  • 2006
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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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나노인덴테이션 시험과 유한요소해석을 이용한 자동차 도금 강판의 도금층 체적 거동결정 및 성형해석 적용

Identification of the Bulk Behavior of Coatings by Nanoindentation Test and FE-Simulation and Its Application to Forming Analysis of the Coated Steel Sheet

  • 이정민 (부산대학교 대학원 정밀기계공학과) ;
  • 이경수 (부산대학교 대학원 정밀기계공학과) ;
  • 고대철 (부산대학교 ILIC) ;
  • 김병민 (부산대학교 기계공학부)
  • 발행 : 2006.11.01
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초록

Coating layers on a coated sheet steel frequently affect distributions of strain rate of sheets and deteriorate the frictional characteristics between sheets and tools in sheet metal forming. Thus, it is important to identify the deformation behavior of these coatings to ensure the success of the sheet forming operation. In this study, the technique using nano-indentation test, FE-simulation and Artificial Neural Network(ANN) were proposed to determine the power law stress-strain behavior of coating layer and the power law behavior of extracted coating layers was examined using FE-simulation of drawing and nano-indentation process. Also, deep drawing test was performed to estimate the formability and frictional characteristic of coated sheet, which was calculated using the linear relationship between drawing force and blank holding force obtained from the deep drawing test. FE-simulations of the drawing process were respectively carried out for single-behavior FE-model having one stress-strain behavior and for layer-behavior FE-model which consist of coating and substrate separately. The results of simulations showed that layer-behavior model can predict drawing forces with more accuracy in comparison with single-behavior model. Also, mean friction coefficients used in FE-simulation signify the value that can occur maximum drawing force in a drawing test.

키워드

참고문헌

  1. Kim, Y. S. and Choi, W. J., 1994, 'A Cup Drawing Test for Measuring the Coefficient of Friction in Sheet Metal Forming,' J. of KSAE, Vol. 2, No. 1, pp. 96-105
  2. Kim, Y. S., Park, K. C. and Cho, J. O., 1991, 'Frictional Characteristics of Electro Zn-Ni Alloy Coated Steel Sheets,' J. of KSME, Vol. 15, No. 6, pp. 1807-1818
  3. Oliver, W. C. and Pharr, G. M., 1989, 'Hysteresis and Discontinuity in the Indentation Load-Displacement Behavior of Silicon,' Scripta Metallurgica, Vol. 23, Issue 11, pp. 1949-1952 https://doi.org/10.1016/0036-9748(89)90488-2
  4. Herbert, E. G., Oliver, W. C. and Pharr, G. M., 2001, 'On the Measurement of Stress-Strain Curves by Spherical Indentation,' Thin solid films, 398-399, pp. 331-335 https://doi.org/10.1016/S0040-6090(01)01439-0
  5. Ahn, J. H., Jeon, E. C. and Kwon, D. I., 2002, 'Derivation of Tensile Flow Properties of Thin Films Using Nanoindentation Technique,' Current applied physics, 2, pp. 525-531 https://doi.org/10.1016/S1567-1739(02)00155-4
  6. Bucaille, J. L. and Michler, J., 2003, 'Determination of Plastic Properties of Metals by Instrumented Indentation Using Different Sharp Indents,' Acta materialia, 51, pp. 1663-1678 https://doi.org/10.1016/S1359-6454(02)00568-2
  7. Dao, M., Chollacoop, N. and Suresh, S., 2001, 'Computational Modeling of the Forward and Reverse Problems in Instrumented Sharp Indentation,' Acta materialia, 49, pp. 3899-3918 https://doi.org/10.1016/S1359-6454(01)00295-6
  8. Shan, Z. and Sitaraman, S. K., 2003 'Elastic-Plastic Characterization of Thin Film Using Nanoindentation Technique,' Thin solid films, 143, pp. 176-181 https://doi.org/10.1016/S0040-6090(03)00663-1
  9. Cao, Y. P. and Lu, J., 2004, 'A New Method to Extract the Plastic Properties of Metal Materials from an Instrumented Spherical Indentation Loading Curve,' Acta materilia, 52,4023-4032 https://doi.org/10.1016/j.actamat.2004.05.018
  10. Bouzakis, K. D., Michailidis, N. and Erkens, G., 2001, 'Thin Hard Coating Stress-Strain Curve Determination Through a FEM Supported Evaluation of Nanoindentation Test Results,' S. & C. tech., 142-144, pp. 102-109 https://doi.org/10.1016/S0257-8972(01)01275-0
  11. Hauw, B. and Oudin, J., 1999, 'Improvement of Stamping Computations by Means of the Identification of the Bulk Behavior of Coatings: Application to Galvanized Sheets,' J. of JMPT, 94, pp. 23-29 https://doi.org/10.1016/S0924-0136(98)00411-7