Comparative Evaluation of Calculated and Experimental Data on the Stress-Strain Condition of Cylindrical Gearwheel Arc Teeth
DOI:
https://doi.org/10.22213/2413-1172-2021-1-45-52Keywords:
gear transmission, circular (arc) teeth, stress-strain condition, ANSYS, strain gaugesAbstract
Circular (arc) teeth gears have a higher load capacity as well as the ability of self-adjustment in the conditions of unbraced machine bodies. For this reason, they are more preferable in heavy-duty transmissions of traction machines. The previously performed studies allow us to determine the optimal geometry of arc teeth surfaces, which provides maximum contact endurance of gears under specified operating conditions. However, for gears whose teeth are subjected to heat-hardening, the most important criterion is the bending strength of the teeth, estimated by the tensile stress at the root of the tooth.
The paper presents a finite element analysis of the stress-strain condition of the arc gear tooth of a locomotive in the ANSYS software package when it is loaded at the top land with a distributed load obtained from solving the contact problem using an analytical method. Calculations of the total displacements and main stresses that characterize the stretching in the metal and are responsible for the occurrence and growth of fatigue cracks are carried out for two loading options: from the convex and concave sides of the tooth. A comparison of the finite element analysis and the strain measurement results of arc teeth in the form of stresses in the root of the tooth on the compressed and stretched sides is considered. Their good coordination is shown: the maximum disagreement between the resistive strain gage readings and the tensile stresses averaged over the resistor base was 11.22 %. However, it has been concluded that the real stresses in the tooth root are averaged and reduced by strain gauges, which should be taken into account in further studies of gear bending strength and reliability. For a more complete strain and stress distribution pattern in the designed parts, it will be more rational to conduct two studies: both computer modeling, and benchmark tests of full-scale samples with further coordination of their results.References
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