DURABILITY ANALYSIS FOR TIRES BY USING CED AND VCCT METHOD WITH CONSIDERATION OF FRICTION

초록

In order to find out a physical quantity which controls the fatigue life of a structure and to predict the fatigue life of tires, a finite element simulation methodology to use the cracking energy density (CED) and the virtual crack closure technique (VCCT) was proposed and applied to a tire. CED was calculated to predict the location and the plane of a newly created crack, and VCCT was used to obtain the strain energy release rate (SERR) at the tip of a newly created crack with consideration of friction. For the SERR calculation, the elements in front of and behind a crack should be split. Finite element simulations showed that as a tire rotated, SERR oscillated with its minimum Occurring just before the center of the contact zone and its maximum occurring just after the center of the contact zone, and the amplitude of SERR could be determined from the simulation results. Then, the fatigue life was predicted based on Paris law using the amplitude of SERR, and it was compared with the durability test data of the tire. The comparison showed that the predicted fatigue life was in fair agreement with the test data.

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