Identify the factors affecting on tire durability and the relationship between them

Tires are an important and special part of car that have a directly relation with the functions such as braking, acceleration and passenger comfort. Increasing the durability of the tire will increase road safety. It is important to note that the fatigue life must be longer than wear life. If the wear life is prolonged, the fatigue life expectancy has to be expanded correspondingly. Fatigue is a common cause of failure of a steel belted radial tire in use. Thermal, speed, tire structure and aging have an important effect on tire fatigue life. In this paper the effect of factors such as thermal, speed, fatigue life and aging on durability and relation between them are studied. Crack initiation and crack growth at filament ends and rubber are also studied in details. At the end, it is shown that the cord type and EPDM have a significant influence on belt endurance. In this paper, it is shown that the mechanical factor, especially the tire fatigue, causes crack initiation and crack growth due to cycling load. Also, heat is generated in the critical areas of the tire due to the visco-elastic property of the compound, which reduces the life of the tire. Also aging along with thermal reduces the tensile strength and degrades the tire.