The strength of rubber under a continuous oscillating stress is of particular significance because such an application occurs so frequently in practice. By endurance strength is meant that stress which a rubber can sustain indefinitely under an oscillating load without damage. It is experimentally ascertained with help of suitable fatigue-tensile machines through a stress-frequency curve. Modern rubber testing machines permit the rubber to be subjected to a loading which corresponds to the one occurring in practice. Thus a good insight is achieved into the elastic and thermal relationship, especially into the fatigue life.
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