Calibration of a Density-Dependent Modified Drucker-Prager Cap Model for AZO Powder

Abstract:

AZO (Aluminum doped Zinc Oxide) is widely used to produce transparent conductive coatings for liquid crystal displays, flat panel displays, plasma displays, touch panels, and electronic ink applications. The densification behavior of AZO powder is a critical factor related to the design of the compaction process. In this study, the densification behavior of AZO powder during cold compaction has been investigated in order to calibrate the modified Drucker-Prager Cap (DPC) model for FE simulations. A compaction test with a cylindrical die was carried out, and two failure tests were performed: the diameteral compression test and the uniaxial compression test. AZO compacts with various densities from the compact tests were used as specimens for the failure tests. Based on the experimental results, the parameters of the modified DPC model were determined through simple manipulations.

• Periodical: Advanced Materials Research (Volumes 482-484)
• Pages: 1249-1256
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.482-484.1249
• Online since: February 2012
• Authors: Yong Bae Kim, Jong Sup Lee, Sang Mok Lee, Hoon Jae Park, Geun An Lee
• Keywords: AZO Powder, Cold Compaction, Densification, Drucker-Prager-Cap, Finite Element Analysis (FEA)

References

[1] I. C. Sinka, J. C. Cunningham and A. Zavaliangos, The effect of wall friction in the compaction of pharmaceutical tablets with curved faces: a validation study of the Drucker-Prager Cap model, Powder Technol. 133 (2003) 33-43.

DOI: 10.1016/s0032-5910(03)00094-9

[2] P. R. Brewin, O. Coube, P. Doremus and J. H. Tweed, Modeling of powder die compaction, Springer-Verlag, London, 2008.

DOI: 10.1007/978-1-84628-099-3

[3] M. H. Es-saheb, Uniaxial strain rate effects in pharmaceutical powders during cold compaction, J. Mater. Sci. 27 (1992) 4151-4159.

DOI: 10.1007/bf01105119

[4] A. Michrafy, D. Ringenbcher and P. Tchoreloff, Modelling the compaction behavior of powders: application to pharmaceutical powders, Powder Technol. 127 (2002) 257-266.

DOI: 10.1016/s0032-5910(02)00119-5

[5] C. –Y. Wu, O. M. Ruddy, A. C. Bentham, B. C. Hancock, S. M. Best and J. A. Elliott, Modelling the mechanical behavior of pharmaceutical powders during compaction, Powder Technol. 152 (2005) 107.

DOI: 10.1016/j.powtec.2005.01.010

[6] J. C. Cunningham, I. C. Sinka and A. Zavaliangos, Analysis of tablet compaction. I. Characterization of mechanical behavior of powder and powder/tooling friction, J. Pharm. Sci. 93 (2004) 2022-2039.

DOI: 10.1002/jps.20110

[7] S. J. Park, H. N. Han, K. H. Oh and D. N. Lee, Model for compaction of metal powders, Int. J. Mech. Sci. 41 (1999) 121-141.

[8] H. Chtourou, M. Guillot and A. Gakwaya, Modeling of the metal powder compaction process using the cap model. Part I. Experimental material characterization and validation, Int. J. Solids Struct. 39 (2002) 1059-1075.

DOI: 10.1016/s0020-7683(01)00255-4

[9] W. Bier, M. P. Dariel, N. Frage, S. Hartmann and O. Michailov, Die compaction of copper powder designed for material parameter identification, Int. J. Mech. Sci. 49 (2007) 766-777.

DOI: 10.1016/j.ijmecsci.2006.09.026

[10] L. H. Han, J. A. Elliot, A. C. Bentham, A. Mills, G. E. Amidon and B. C. Hancock, Amodified Drucker-Prager Cap model for die compaction simulation of pharmaceutical powders, Int. J. Solids Struct. 45 (2008) 3088-3106.

DOI: 10.1016/j.ijsolstr.2008.01.024

[11] T. Sinha, J. S. Curtis, B. C. Hancock and C. Wassgren, A study on the sensitivity of Drucker-Prager Cap model parameters during the decompression phase of powder compaction simulations, Powder Technol. 198 (2010) 315-324.

DOI: 10.1016/j.powtec.2009.10.025

[12] T. Sinha, R. Bharadwaj, J. S. Curtis, B. C. Hancock and C. Wassgren, Finite element analysis of pharmaceutical tablet compaction using a density dependent material plasticity model, Powder Technol. 202 (2010) 46.

DOI: 10.1016/j.powtec.2010.04.001