Usure et frottement entre le segment et la chemise dans un moteur à combustion : modélisation numérique par la méthode des éléments de frontière

Abstract : aln the framework of a European Brite Euram contract we have studied the contact between the coated piston ring and the cylinder of a combustion engine. ln particular, the issue was to analyse the effect of hard, wear resistant coatings coatings on the stress fields in the coated material. ln an initial, experimental approach we have bench marked the friction and wear behaviour of real machine elements in a reciprocating pin/disk configuration both in the dry and lubricated friction mode. ln su ch laboratory environment D.L.C. coatings turned out to be more wear resistant than conventional hard chromium coatings. ln the main part of this research, we have done modelling of the simplified problem of an elastic 2D (coated cylinder /flat ) contact. ln this part we have implemented a boundary element numerical approach in conjunction with domain decompositon. This specifically developed code has the advantage of operating on a standard PC yielding excellent precision and reasonable computation time (in general less than one hour). We have studied the effect of the contact pressure on the stress fields in coated piston rings both for bi-layer and multilayer coatings. ln the absence of hydrostatic pressure in the combustion chamber - as compared to the hard chromium - the D.L.C. coating is found to correspond to a lower resolved stress field in the substrate and the coating. This is in qualitative agreement with our experimental results. For multilayer coatings, the best attenuation of the contact stress field in the coated piston rings is achieved for graded evolution of Young'modulus from the interface to the ultimate coating surface. This leads to almost total eliinination of stress discontinuities at the interfaces and attenuation of the resolved Tresca stress fields. The main effect of the pressure in the combustion chamber is to reduce the effective contact pressure and the associated real contact area between the piston ring and the cylinder.
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Colombe Saïzonou. Usure et frottement entre le segment et la chemise dans un moteur à combustion : modélisation numérique par la méthode des éléments de frontière. Autre [cond-mat.other]. Institut National Polytechnique de Lorraine, 2004. Français. ⟨NNT : 2004INPL059N⟩. ⟨tel-01749878⟩

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