Mihaela SIMION, Mircea Cristian DUDESCU, Radu CHIOREAN


The paper aim is to investigate the experimental micro-hardness process by finite elements method (FEM) and validation of the numerical simulation by geometric evaluation of the imprint's parameters numerically obtained with the experimental results. In the first stage, micro-indentation experiments with a Vickers indenter were performed on two materials, aluminum 6060 and cooper C110. The average length of imprint diagonals and average value of Vickers micro-hardness of the materials were determined. In the second stage, the micro-indentation process for both materials were simulated by finite element method using a 3D model of a Vickers indenter for which the geometric and mechanical characteristics are known. For an accurate simulation the mechanical constants and material behavior in terms of strain –stress curves of the studied materials, has to be determined. Thus, the uniaxial tensile test was performed for both materials and their mechanical properties and the stress – strain curves were measured. The values of Vickers micro-hardness and the geometric parameters of imprints obtained from the finite element simulation were in very good agreement with the  results obtained from micro-indentation experiments.

Key words: Vickers micro-hardness, micro-indentation, imprint parameters, numerical simulation.

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