Prediction of loading and fatigue life of industrial tractor track links based on dynamic modeling
DOI:
https://doi.org/10.14529/engin260308Keywords:
industrial tractor, tracked undercarriage, simulation modeling, fatigue lifeAbstract
The track links of mobile machines come into contact with the ground surface during motion and are subjected to severe dynamic loads. The track components are prone to abrasive wear and fatigue failure. In the track chains of tractors, open joints have traditionally been used; therefore, the service life of the track was determined by the abrasive wear of the joints. Currently, new designs employ sealed joints with grease or liquid lubrication. Their application significantly increases the joint service life, and fatigue failure of the track links begins to manifest during operation. Consequently, the development of methods for predicting the fatigue life of track links in industrial tractors is a relevant task. This paper is devoted to the development of methods for the computational assessment of the loading and durability of track links of industrial tractors with semi-rigid suspension. A model incorporating the tractor body, track frames, track rollers, idlers, sprockets, and other undercarriage components has been developed using the Universal Mechanism software package. The track chains are considered as chains consisting of individual links. The Bekker and Mohr – Coulomb relationships are used to describe soil deformation upon interaction with the track links. As a result of simulating tractor motion, time histories of loads acting on each track link from the soil and undercarriage components are obtained. These time histories are used to calculate the accumulated fatigue damage. For the computational assessment of fatigue life, the Ansys software package (Mechanical and nCode DesignLife modules) is employed. The principle of superposition is used to determine the stress strain state under the combined action of multiple loads. Analysis of the results shows that the calculated zone of maximum accumulated damage coincides with the zone of fatigue failure observed during operation. This confirms the validity of the developed methodology.References
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