Persistence of Granular Structure during Die Compaction of Ceramic Powders

Abstract

Glass spheres were used as a model system to investigate granule failure during die compaction. Stresses within an assembly of spheres follow a network of pathways. When the spheres are of uniform composition, the magnitude of the stresses within a pair of contacting granules is a function of the locally transmitted stress and the diameter of the two spheres. Results obtained using glass spheres demonstrated the statistical nature of granule failure during compaction, with some granules failing at very low applied pressures while others (~40% by volume) persist at even the highest applied loads. Within a distribution of granule sizes, those granules with smaller diameter were seen to have a higher probability of failure at low pressure than were larger granules. These results are consistent with those observed during die compaction of granulated alumina powder.

This is a preview of subscription content, access via your institution.

References

  1. 1.

    J.S. Reed, Principles of Ceramic Processing, 2nd ed. (John Wiley and Sons, Inc., New York, 1995), pp. 425–33.

    Google Scholar 

  2. 2.

    P.A. Cundall, A. Drescher and O.D.L. Strack, in IUTAM Symposium on Deformation and Failure of Granular Materials, edited by P.A. Vermeer and H.J. Luger (A.A. Balkema, Rotterdam, 1982), pp. 355–70.

    Google Scholar 

  3. 3.

    A. Drescher and G. de Josselin de Jong, J. Mech. Phys. Sol., 20, 337–51 (1972).

    Article  Google Scholar 

  4. 4.

    R.J. Roark and W.C. Young, Formulas for Stress and Strain, 5th ed. (McGraw-Hill Book Company, New York, 1975), pp. 513–29.

    Google Scholar 

  5. 5.

    W.J. Walker Jr, and J.S. Reed, Am. Ceram. Soc. Bull., 78 (6), 53–57, (1999).

    CAS  Google Scholar 

Download references

Author information

Affiliations

Authors

Corresponding author

Correspondence to William J. Walker Jr.

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Walker, W.J. Persistence of Granular Structure during Die Compaction of Ceramic Powders. MRS Online Proceedings Library 627, 64 (2000). https://doi.org/10.1557/PROC-627-BB6.4

Download citation