The roles of adhesion, internal heat generation and elevated temperatures in normally loaded, sliding rough surfaces

INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES

卷:185

Article

Poole, Benjamin¹  Barzdajn, Bartosz^1,4  Dini, Daniele²  Stewart, David³  Dunne, Fionn P. E.¹ 

[1] Imperial Coll, Dept Mat, London SW7 2AZ, England

[2] Imperial Coll, Dept Mech Engn, London SW7 2AZ, England

[3] Rolls Royce PLC, Raynesway, Derby, England

[4] Univ Manchester, Sch Mat, Manchester M1 3BB, Lancs, England

关键词: Sliding contact;    Crystal plasticity;    Finite element;    Galling;    Heat generation;   

DOI  :  10.1016/j.ijsolstr.2019.09.012

来源: Elsevier

【 摘 要 】

The thermal effects of plastic and frictional heat generation and elevated temperature were examined along with the role of adhesion in the context of galling wear, using a representative crystal plasticity, normally loaded, sliding surface model. Galling frequency behaviour was predicted for 316L steel. Deformation of the surfaces was dominated by the surface geometry, with no significant effect due to variations in frictional models. Plastic and frictional heating were found to have a minimal effect on the deformation of the surface, with the rapid conduction of heat preventing any highly localised heating. There was no corresponding effect on the predicted galling frequency response. Isothermal, elevated temperature conditions caused a decrease in galling resistance, driven by the temperature sensitivity of the critical resolved shear stress. The extent of deformation, as quantified by the area of plastically deformed material and plastic reach, increased with temperature. Comparisons were made with literature results for several surface amplitude and wavelength conditions. Model results compared favourably with those in the literature. However, the reduction in predicted galling resistance with elevated temperature for a fixed surface was not as severe as observations in the literature, suggesting other mechanisms (e.g. phase transformations, surface coatings and oxides) are likely important. (C) 2019 Elsevier Ltd. All rights reserved.

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