PAPERS & REPORTS

Introduce technical papers and reports of IIT (Instrumented Indentation Technology) and correlated fields.

 

Title

Effective indenter radius and frame compliance in instrumented indentation testing using a spherical indenter

Author

Seung-Kyun Kang

Department of Materials Science and Engineering, Seoul National University, Seoul 151-744, Korea

Ju-Young Kima)

Materials Science, California Institute of Technology, Pasadena, California 91106

Ingeun Kang and Dongil Kwon

Department of Materials Science and Engineering, Seoul National University, Seoul 151-744, Korea

Press and Date of publication

(Received 31 January 2009; accepted 22 June 2009)

Abstract

We introduce a novel method to correct for imperfect indenter geometry and frame compliance in instrumented indentation testing with a spherical indenter. Effective radii were measured directly from residual indentation marks at various contact depths (ratio of contact depth to indenter radius between 0.1 and 0.9) and were determined as a function of contact depth. Frame compliance was found to depend on contact depth especially at small indentation depths, which is successfully explained using the concept of an extended frame boundary. Improved representative stress-strain values as well as hardness and elastic modulus were obtained over the entire contact depth.