skip to primary navigationskip to content

Composites and Coatings Group

Department of Materials Science & Metallurgy

Studying at Cambridge

 

SEMPID

Software for the Extraction of Material Properties from Indentation Data

In conjunction with Cambridge-based Double Precision Consultancy, a methodology has recently been developed for inferring certain material properties from experimental indentation (load-displacement-time) data.

Details of the methodology, which has been extensively validated, can be found in the following pair of papers:

1. Use of Quasi-static Nanoindentation Data to Obtain Stress-Strain Characteristics of Metallic Materials

2. A Procedure for Extracting Primary and Secondary Creep Parameters from Nanoindentation Data

The validation has included a number of “blind” trials, carried out under the supervision of AWE.  The methodology involves repeated comparisons between experimental data and predictions from an FEM model of the indentation process, with iterative optimisation of the constitutive relations governing the material response.  These iterations have been carried out “manually”, using a commercial FEM package.

It is now being proposed that a customised, stand-alone software package should be developed, to promote wider and more user-friendly implementation of the methodology.  This will eliminate the need for the user to have access to a commercial FEM package, and will also at least partially automate the iteration process.  A start has already been made on this package, which is called SEMPID (Software for the Extraction of Material Properties from Indentation Data).

With SEMPID it will be possible to infer the following material properties from experimental indentation data:

  • Yield stress
  • Work hardening parameters for linear and power law work hardening materials
  • Primary and steady state creep parameters, including the stress exponent (n) and the activation energy (Q)

We are interested in gauging the likely level of interest in this package.  It would therefore be very helpful if you could complete the following online questionnaire (which should take approximately 2 minutes of your time):

SEMPID Questionnaire - Click HERE