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

M.R. ROSENBERGER ; E. FORLERER ; C. E. SCHVEZOV

Philadelphia

Conferencia; 18th International Conference on the Wear of Materials; 2011

Wear of Materials, Inc and Elsevier

During the wear of an aluminium pin under dry sliding it is normally observed a lot of material plastically deformed and placed in the ending borders, forming the burr. Several mechanisms were proposed to explain this deformation, like: a softening due to the high flash temperature, a generation of turbulent plastic deformation due to complex load distributions, generation of pores and subsurface cracks grow. The subsurface deformation is important when a tribolayer is formed on the worn surfaces.   The influence of the temperature on burr deformation was studied using finite element analysis. A three-dimensional pin was considered in the model, 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.