11th International Scientific Conference Research and Development of Mechanical Elements and Systems IRMES (2025) [pp. 17-22]
AUTHOR(S) / AUTOR(I): Goran MIHAJLOVIĆ 
, Marina KARIĆ , Jelena ERIĆ OBUĆINA , Zvonko PETROVIĆ
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DOI: 10.46793/IRMES25.017M
ABSTRACT / SAŽETAK:
During the operation of various tribomechanical systems, their constituent elements perform the intended working function under greater or lesser working load, moving at a certain relative speed in relation to the contact surfaces of the elements with which they are in contact. Then, a specific stress arises in the contact zone, which in tribology is known as surface-contact stress. It further causes working stresses that manifest themselves in the form of surface pressure that is equal on the contacting surfaces of both solid bodies (because the force of action is equal to the force of reaction). For those materials for which it is possible to find the value of their modulus of elasticity in the appropriate tables and catalogs, the Hertz surface pressure is calculated (most common machine materials), while for materials for which there are no measured values of the modulus of elasticity, the Stribek surface pressure is calculated using empirical formulas (these are all soft materials).
As a consequence of this condition, various types of surface damage occur on the contact surfaces of the bonded elements. In practice, they manifest themselves in the behavior of the outer and inner boundary layers on the surfaces of solid bodies, as well as in the occurrence of larger or smaller plastic deformations if the surface pressure exceeds permissible values. Therefore, tribology is often defined as the science and technology of the processes of material mass dissipation of solid bodies that are in direct contact.
In this paper, using a two-factor selection experimental design, an analysis of the significance of the influence of the following experimental factors was performed: axial wedging force (Fa) and static friction coefficient (m) on the value of the surface pressure (r) at the contact of conical clamping rings. Surface pressure is considered one of the most important parameters on which the load capacity of a conical clamping joint directly depends.
The entire experiment was carried out in the Hydraulics and Pneumatics Laboratory of the Academy of Applied Studies Šumadija – Department in Trstenik, during testing of the load-bearing capacity of the shaft-gear mechanical connection of the hydraulic unit of a building machine.
KEYWORDS / KLJUČNE REČI:
tribology; surface pressure; conical rings
ACKNOWLEDGEMENT / PROJEKAT:
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