A numerical and experimental study of the indentation mechanics of plasticine

This paper describes an experimental and analytical study of contact compliance data for deriving material properties of the model elastoviscoplastic material, plasticine, from spherical and conical indentation measurements. An analytical model is employed to determine the material characteristics such as elastic modulus and yield stress from the experimental data. It is based on the Box-Cox transformation for minimizing the influence of the error inherent in compliance methods. The material characteristics deduced for plasticine are shown to be consistent with the values reported for compression tests of this material. Moreover, for the elastic modulus, yield stress, plastic flow consistency, plastic flow index and load-depth relationship, a close correlation was obtained between a finite element simulation of the indentation process and the experimental data.

[1]  D. Cox,et al.  An Analysis of Transformations , 1964 .

[2]  Shiro Biwa,et al.  An analysis of fully plastic Brinell indentation , 1995 .

[3]  B. Briscoe,et al.  The elastoplastic response of poly(methyl methacrylate) to indentation , 1996, Proceedings of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences.

[4]  M. A. Moore,et al.  On the correlation of indentation experiments , 1977 .

[5]  A. Zdunek,et al.  A theoretical study of the Brinell hardness test , 1989, Proceedings of the Royal Society of London. A. Mathematical and Physical Sciences.

[6]  K. Johnson.  Contact Mechanics: Frontmatter , 1985 .

[7]  Neville R. Moody.  Fundamentals of nanoindentation and nanotribology : symposium held April 13-17, 1998, San Francisco, California, U.S.A. , 1998 .

[8]  D. Tabor.  A simple theory of static and dynamic hardness , 1948, Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences.

[9]  A. F. Bower,et al.  Indentation of a power law creeping solid , 1993, Proceedings of the Royal Society of London. Series A: Mathematical and Physical Sciences.

[10]  Norman A. Fleck,et al.  Spherical indentation of elastic–plastic solids , 1999, Proceedings of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences.

[11]  G. Pharr,et al.  An improved technique for determining hardness and elastic modulus using load and displacement sensing indentation experiments , 1992 .

[12]  B. Edmondson,et al.  An experimental and theoretical study of the squeeze-film deformation and flow of elastoplastic fluids , 1994 .

[13]  M. M. Chaudhri.  Subsurface deformation patterns around indentations in work-hardened mild steel , 1993 .

[14]  J. Georges,et al.  Vickers Indentation Curves of Magnesium Oxide (MgO) , 1984 .

[15]  R. Hill.  Similarity analysis of creep indentation tests , 1992, Proceedings of the Royal Society of London. Series A: Mathematical and Physical Sciences.

[16]  Brian J. Briscoe,et al.  The effect of indenter geometry on the elastic response to indentation , 1994 .

[17]  David Tabor,et al.  Elastic Recovery of Conical Indentations , 1961 .

[18]  I. N. Sneddon.  The relation between load and penetration in the axisymmetric boussinesq problem for a punch of arbitrary profile , 1965 .