In order to investigate fatigue characteristics of vulcanized natural rubber (NR), fatigue
tests are carried out under various stress ratios R (R = minimum stress / maximum stress). It was
considered that the fatigue cracks were initiated from flaws in very early stage of total life. The
fatigue damage process was almost the fatigue crack propagation process and it is independent of R.
The crack growth rate was proportional to the crack length to about the first power, when the crack
length was defined as the length of the direction perpendicular to the loading direction. Miner’s rule
was examined to observe the fatigue crack behavior and checked by using two-step loading fatigue
tests experimentally. It seems Miner’s rule has a possibility to predict fatigue lives.
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