The stress-strain state of the external rubber element of supporting roller of a caterpillar propulsion
Abstract
Introduction. Supporting rollers with an external rubber element are used in the design of the caterpillar propulsion. The durability of the support roller is limited by the durability of the rubber element. The causes of destruction of the rubber element are wear on the outer surface and fatigue failure of the rubber. To assess the magnitude of these factors, it is necessary to know the stress-strain state of the rubber element of the outer rubber element.
The purpose of the study was to assess the influence of the structural parameters of the supporting roller rubber element, namely, the influence of the inclination angle on the lateral surface of the rubber element in its stress-strain state as well as the forces of friction in the rubber element contact area with the running road of the link.
Methodology and research methods. When determining the stress-strain state, the mechanical properties of rubber at large deformations were described by the neo-Hook potential. The value of the radial force acting on the supporting roller was set taking into account dynamic loads during oscillations of the free track deviation.
Scientific novelty and results. For the considered design options for the rubber element, the following things were determined: specific strain energy; movement of the rubber element along the surface in the area of contact with the road; contact pressure of the rubber element on to the running road; the work of friction forces of the moving rubber element with the road in the area of contact. It has been shown that the concentration regions of the specific strain energy and the regions of maximum specific work of the friction forces on the surface of the rubber element coincided with a slope of the generatrix of the lateral surface of 10° and 15°.
Practical significance. Based on the results obtained, the advantage of a trapezoidal cross section with an generatrix inclination angle of the rubber element lateral surface of 20° was shown.
About the Authors
S. A. Korostelev
Polzunov Altai State Technical University
Russian Federation
Russian Federation
D.Sc. (Eng), associate professor
Barnaul 656038
Yu. V. Medvedev
Polzunov Altai State Technical University
Russian Federation
Russian Federation
engineer
Barnaul 656038
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Review
For citations:
Korostelev S.A., Medvedev Yu.V. The stress-strain state of the external rubber element of supporting roller of a caterpillar propulsion. Trudy NAMI. 2019;(3):36-42. (In Russ.)
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