Abstract
This study focuses on the creation of an isothermal elastic model to highlight, through stresses, the occurrence of plastic deformation in certain crank angles under extreme dry conditions inside an internal combustion engine. The stresses that are exported from this analysis are pointing out not only the necessity for an elastoplastic model to be created, but also the importance of predicting the correct friction coefficient, as pointed out by both the contact surface stress and those in depth of the two bodies in contact. A comparison between two coefficients of frictions and one frictionless case is conducted. The comparison between the finite element model and the adhesion mathematical model of Johnson, Kendall and Roberts (JKR), seals the importance of the interaction forces, acting on the common solid surface, in the pursuit of defining a propriate contact patch. Furthermore, a three-dimensional model is proposed for further investigation, highlighting the importance of modelling surface’s micro asperities for a solid stress analysis.
Highlights
Recent comprehensive study by Holmberg et al [1] showed that energy losses are the highest in engines and transmissions due to contact
Bhushan conducted research for both a single (Hertzian) [9] and multiple asperity [10] approach laying the foundations of the so-called contact mechanics of rough surfaces field
Shi and Zhao [13] compared the adhesion JKR and DMT models with the adhesion less Hertzian model mentioning the influence of dimensionless load parameter
Summary
Recent comprehensive study by Holmberg et al [1] showed that energy losses are the highest in engines and transmissions due to contact. The ring-pack assembly is the primary source of friction [2]. This contact is one of the most complex to analyse because of the transient nature of this conjunction and the variation of the regimes of lubrication. The basic theory of contact between elastic bodies has been of great importance for many years. Bhushan conducted research for both a single (Hertzian) [9] and multiple asperity [10] approach laying the foundations of the so-called contact mechanics of rough surfaces field. Schwarz [11] was focused on calculating the elastic deformation of a sphere on a flat surface
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