Abstract
Vehicle tires are major components that are subjected to fatigue loading and their durability is of economic interest as it is directly related to the safety of property and the life of producers and consumers. Tire durability is also a major issue of energy conservation and environmental protection. This research aims to establish a reasonable fatigue evaluation and optimization method that effectively improves tire fatigue life. In the study, 11.00R20 and 12.00R20 all-steel radial truck tires were the research objects, and the guiding hypothesis for the research was that “the maximum area of the strain energy density gradient modulus corresponds to the initial failure area, its direction corresponds to the crack propagation direction, and also the maximum strain energy value is inversely proportional to the tire fatigue life.” Through finite element analysis and durability test, the strain energy density gradient was determined as tire fatigue evaluation index, and the hypothesis of tire fatigue life prediction was validated. At the same time, the sensitivities of strain energy gradient to the tire structure parameters were calculated. Besides, the relationship between the structure parameters and the fatigue life was as well established in this paper. This study has formulated a tire fatigue evaluation method and proposed an effective optimization method for enhancing tire fatigue life. The results obtained are of high application value in offering guidance for tire structural design and useful for refining the fatigue failure theory of truck radial tires and improving durability.
Highlights
Introduction e durability ofTBR (Truck Bus Radial) tire is directly related to the economic benefits of tire producers, consumer satisfaction, and safety
By observing the failure forms of each tire, it was found that the specific failure parts and the direction of crack propagation are different, yet the failure mode is mainly composed of tire bead and shoulder crack, indicating that it is difficult to study the fatigue durability of tire by the virtual crack closure technique (VCCT) method
The effectiveness of the gradient strain energy density in the fatigue failure and fatigue life prediction of the tire is discussed by means of finite element simulation and tire endurance test. e results show that the maximum value of the strain energy density gradient modulus corresponds to the initial failure zone, which is inversely proportional to the fatigue life of the tire, and is in the direction of crack propagation
Summary
The tire durability test was carried out using the tire fatigue durability tester. By observing the failure forms of each tire, it was found that the specific failure parts and the direction of crack propagation are different, yet the failure mode is mainly composed of tire bead and shoulder crack, indicating that it is difficult to study the fatigue durability of tire by the VCCT method. This method needs to set the initial crack during tire modeling.
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