Abstract
Pulsating loading fatigue tests were carried out on a very thin wire of 0.32mm in diameter being used for the load supporting component of high pressure hoses or tires. The fatigue tests were carried out in a special testing device developed in this study, utilizing electric resonance. To understand the fatigue strength controlling factor, the relationships between the fatigue strength and other mechanical properties such as tensile strength and hardness of the materials tested were examined. Although the large size inclusion contained in the matrix was presumably supposed to dominate the total fatigue life mainly, the results in reality showed that a local region with, lowest hardness determined the entire fatigue life. The lowest value of hardness was coincided with a threshold value estimated from the Weibull type distribution of hardness.
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