Modelling the influence of the temperature on the subsurface deformation of a pin during a wear test

MARIO ROBERTO ROSENBERGER; FORLERER, E.; SCHVEZOV, C. E.

Filadelfia

Conferencia; 18 International conference on wear of materials, WOM 2011; 2011

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.