Abstract
The fatigue behavior of Poly (ethylene terephthalate) (PET) tire cords were investigated as functions of degree of polymerization and twist number of tire cords both of which were the major factors governing the fatigue properties.The fatigue tests were conducted by means of a Goodyear tube and a Goodrich disk fatigue testers. After the fatigue tests, tire cords isolated from rubber were examined by an optical microscope in a view point of fractography.The results are summarized as follows:(1) The higher the degree of polymerization of PET tire cord, the greater the resistance to compression-induced fatigue.(2) In the tube fatigue test, the fatigue life considerably depends on the temperature of tube. The tube temperature was found to be affected by the degree of polymerization of PET tire cord.(3) In the case of disk fatigue test, a fibrillation was observed at the very early stage of fatigue test.(4) The structural deterioration such as occurrence of kinkband was observed only in the cases of low degrees of polymerization or low twist number which are considered as giving the cords a very severe fatigue condition.
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