CAPABILITIES OF THE LOAD AND PARTIAL UNLOAD TECHNIQUE

Tanja Haas, Gottfried Bosch, Hans-Peter Vollmar

Abstract

The load and partial unload technique adds partial unload processes to the load curve. The mechanical properties like elastic modulus can be determined for each of these unload curves. This allows for a faster depth dependent measurement of the characteristic quantities. If the elastic modulus of a material is known and not dependent of the depth, an indenter shape correction can be performed using this technique. <br />The results of such a correction are compared with those gained using a correction based on the Martens hardness of the material. The elastic modulus E_IT as well as the Martens hardness H_M are corrected with both methods. <br />The results of both approaches are comparable down to an indentation depth of 100 nm. A Fischerscope HM2000 was used to perform the measurements.

Keywords

Load and partial unload technique, elastic modulus, Martens hardness

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IMEKO TC

TC3 - Measurement of Force, Mass, Torque, and Gravity

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