The indentation method according to
DIN SPEC 4864
0.2% proof stress Rp0.2 and tensile strength Rm from test indentations
The indentation method according to DIN SPEC 4864 opens new applications in the field of materials testing. The comparative tensile strength RIm and comparative yield strength RIp0.2 for tensile testing can be tested quickly and easily. In addition, the local flow curve as a measurement result provides more information than the classic hardness conversion to tensile strength according to DIN EN ISO 18265.
The basic idea of the indentation method is to obtain material properties by comparing FEM simulations with real measurement data. The advantage is that input and output data are known with FEM simulation. If simulation and experiment match, the material properties can be taken from the simulation.
Procedure of the test procedure
- Hardness impression is placed in a specimen under force control and then measured three-dimensionally.
- FEM simulations with the same boundary conditions (force, application time, specimen) are varied until the geometry of the simulation corresponds to the geometry of the 3D measurement.
- The method converges when a sufficient agreement between simulation and experiment is reached.
- The material properties are taken from the simulation which agrees with the experiment.