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对Ｓ－Ｎ曲线的特征进行了描述，并对目前所采用的多种Ｓ－Ｎ曲线及疲劳极限的近似预测方法进行了评述，由此提出了新的预测方法．实验证明：本文提出的方法有较高的预测精度，通用性强，有一定的实用价值．
The characteristics of S-N curves are described, and the methods of approximate prediction of S-N curves and fatigue limits currently used are reviewed. A new prediction method is proposed. Experiments show that the proposed method has a high prediction accuracy, versatility and a certain practical value.