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Enhanced Spherical Indentation Techniques for Rubber Property Evaluation

향상된 구형압입 고무 물성평가법

  • 황규민 (서강대학교 대학원 기계공학과) ;
  • 오중수 (서강대학교 대학원 기계공학과) ;
  • 이형일 (서강대학교 기계공학과)
  • Published : 2009.12.01

Abstract

In this study, we enhance the numerical approach of Lee et al.$^{(1)}$ to spherical indentation technique for property evaluation of hyper-elastic rubber. We first determine the friction coefficient between rubber and indenter in a practical viewpoint. We perform finite element numerical simulations for deeper indentation depth. An optimal data acquisition spot is selected, which features sufficiently large strain energy density and negligible frictional effect. We then improve two normalized functions mapping an indentation load vs. deflection curve into a strain energy density vs. first invariant curve, the latter of which in turn gives the Yeoh-model constants. The enhanced spherical indentation approach produces the rubber material properties with an average error of less than 3%.

Keywords

Spherical Indenter;Rubber Material Properties;Load-depth Curves;Strain Energy Density;First Invariant;Engineering Stress-strain;True Stress-strain

References

  1. Lee, H., Kim, D. W., Lee, J. H. and Nahm, S. H. 2004, “Software and Hardware Development of Micro- Indenter for Material Property Evaluation of Hyperelastic Rubber,” Transactions of KSME (A), Vol. 28, No. 6, pp. 816~825 https://doi.org/10.3795/KSME-A.2004.28.6.816
  2. Kim, W. D. and Kim, W. S., 2003, "Mechanical Characteristics Prediction and Evaluation of the Vibration Isolation Rubber Material,”"Society for Noise and Vibration Engineers, Vol. 13, No.5, pp. 319~325
  3. Kim, W. D., Kim, D. J., Kim, W. S and Lee, Y. S., 2003, “A Study on the Equi-biaxial Tension Test of Rubber Material,” Transactions of KSAE, Vol. 11, No.5, pp. 95~104
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  5. Yeoh, O. H., 1993, “Some Forms of the Strain Energy Function for Rubber,” Rubber Chemistry and Technology, Vol. 66, pp. 754~771 https://doi.org/10.5254/1.3538343
  6. Kim, W. D., Kim, D. J., Na, C. W. and Lee, Y. S, 2001, “A Study on the Frictional Characteristics of Vulcanized Rubber Plates,” Journal of Korean Rubber Society, Vol. 36, No. 2, pp. 121~129
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