But steel alloys subjected to cyclic stress levels below their endurance limit rarely fail as a result of fatigue.
但是在钢铁合金的耐用度限制下，作为疲劳的结果，它们经受周期压力级别很少失灵。
Care should be taken when using the idea of an endurance limit as a "safe stress" below which fatigue will not occur.
用疲劳极限作为低于它将不出现疲劳的安全应力时，必须要注意。安全应力时，必须要注意。
In this paper, contact endurance limit diagram of 45 normalizing gear is obtained from contact fatigue teste on 8 pairs of CATT gears. It is worthy reference for a calculation of gear design.
本文通过八对圆弧齿线圆柱齿轮的运转接触疲劳试验，得到了45钢正火齿轮的接触疲劳极限应力框图，可供圆弧齿线圆柱齿轮传动的接触强度计算参考使用。
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