Strength values from hardness impressions
The basic idea of the method is to obtain material properties by comparing FEM simulations with real measurement data. The advantage is that with FEM simulation input and output data are known. If the simulation and experiment match, the material properties can be taken from the simulation.
Procedure of the test method
- Hardness impression is force-controlled in a sample and subsequently measured three-dimensionally.
- FEM simulations with the same boundary conditions (force, application time, specimen) are varied until the geometry of the simulation coincides with the geometry of the 3D measurement.
- The method converges, if a sufficient match between simulation and experiment is achieved.
- The material characteristics are taken from the simulation which matches the experiment.
You would like to know more about the impression procedure?
The use of the indentation process in industry and research opens up new fields of application for mechanical material testing. Based on a hardness impression, the indentation method can be used to determine the local Rp0.2 yield strength and the tensile strength Rm.