INVESTIGADORES
ROSENBERGER Mario Roberto
congresos y reuniones científicas
Título:
Modelling the influence of the temperature on the subsurface deformation of a pin during a wear test
Autor/es:
MARIO ROBERTO ROSENBERGER; FORLERER, E.; SCHVEZOV, C. E.
Lugar:
Filadelfia
Reunión:
Conferencia; 18 International conference on wear of materials, WOM 2011; 2011
Resumen:
During the dry sliding of aluminium it is
normally observed a large amount of material plastically deformed which is
accumulated in the ending borders, forming the burr. This material comes mainly
form the subsurface and it is important when a tribolayer is formed on the worn
surfaces.
The influence of the temperature on burr
formation was studied using finite element analysis. In the model, a
three-dimensional pin was considered, temperature dependent properties
corresponding to an A1100 aluminium alloy were assumed. Normal
and tangential loads were applied in the circular face of the pin simulating a test performed in a pin
on ring machine. An elasto-plastic model was employed with small deformation in
the plastic range.
The simulation was performed applying
different temperatures simulating different conditions of heat generation and
gradually increasing the tangential load.
A sudden deformation, the burr, was observed
when the tangential load achieves a well determined value defined as the
critical load. This critical load increases when the temperature diminishes.
The results of the model are
compared with experimental results performed on A1060 aluminium alloys
reinforced with 15 % alumina particles that generate a tribolayer. The
comparison shows little deviation
between predictions and experiments which may be attributed to the difference
of mechanical properties between the alloys. The results of the model are discussed an employed to calculate the collapse
load of the protecting tribolayer.