Spherical indentation has the potential for measuring the elastic-plastic properties of a power-law hardening bulk specimen with just one simple test. In this paper, based on a new definition of representative strain, a set of dimensionless functions that relate the indentation characteristics and material properties are established by means of extensive finite element analyses. A new numerical algorithm of reverse analysis is proposed to extract the elastic-plastic properties of bulk materials from one indentation test. This method is applicable to a wide range of power-law hardening materials. Good agreement is found between the material properties obtained from the reverse analysis of the new approach and experimental data.
Bibliographical noteThe work is supported in part by NSF CMS-0407743, and in part by the Department of Civil Engineering and Engineering Mechanics, Columbia University.
- Finite element analysis
- Plastic deformation