INVESTIGADORES
ROSENBERGER Mario Roberto
congresos y reuniones científicas
Título:
2.1.2.8 Modeling the Microhardness of Metal Matrix Composites.
Autor/es:
MARIO ROBERTO ROSENBERGER; SCHVEZOV, C. E.; FORLERER, E.
Lugar:
San Diego, California, USA
Reunión:
Congreso; 15th International Conference on WEAR OF MATERIALS; 2005
Institución organizadora:
WOM Steering Committee and Elsevier
Resumen:
The microhardness of metal
matrix composites are affected by the
presence of reinforcing particles in the subsurface of the material.
The microhardness is directly related to the wear properties of the composite.
In the present investigation a finite element method to model is developed to
quantify the effect of the diameter of the indenter and the indentation depth
in the indented diameter in the sample.
The model includes a spherical indenter, which is pressed against a soft
metal like aluminum, which contains
reinforcing particles. The results of the model are
validated comparing the predicted values of indentation impression, the given
properties of the model material and the
standard impression given by the Brinell
method. The results show a very good agreement
between predicted and tabulated impressions. The model is employed as a first
step, to predict indentation impressions in simple configurations of composites
consisting of a matrix containing one particle of the same diameter as the
indenter. The model is dynamic and simulates the constant load, which is
applied during thirty seconds after which the indenter is retried. The
diameters of the impression for reinforced and matrix materialsare compared, as well as the stress and
strain fields in both materials. The
results show that the impressions of
reinforced materials are smaller than those for non-reinforced materials and the values depend on the position of the
particle. The model results are
discussed in relation with the resulting scatter of hardness values