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Advanced materials

Mechanical characterisation of metallic materials
[Collaboration with the University of Rome “Tor Vergata”]

An indentation technique based on the use of a flat-top (diam. variable from 0.7-1 mm) cylindrical indenter for mechanical characterisation (FIMEC = Flat top cylindrical Indentation for MEchanical Characterization) of metallic materials has been developed.
The pressure-penetration curves (see figure below) are initially linear up to a pressure value equal to pL, then show a pseudo-linear stage up to a pressure py, followed by a plastic stage with a strongly decreasing slope and, finally, a plastic stage with a practically constant slope. It can be demonstrated that under certain test conditions the yield point sy of any metallic materials is equal to Py/3. The test also allows for calculating the modulus of elasticity and, for materials that show ductile-to-brittle transition, it is also possible to determine the ductile-to-brittle transition temperature (DBTT). Compared to micro-indentation, this technique employs a much simpler instrument, the results are hardly affected by the surface conditions of the sample so information on the bulk properties can be obtained for direct comparison with the tensile tests, and it can be used for on-line inspection of welding processes or machining (forging, extrusion).

cylindrical indenterTest device:
cylindrical indenter
Pressure-indentation curve
Pressure-indentation curve

 

References and Publications



17/4/07