总变幅

本文引入疲劳过程区的概念，提出以疲劳过程区应变幅的平均值作为疲劳寿命预测的Manson-Coffin公式中的总应变幅。

In this paper , the concept of fatigue process zone is used for calculating average strain substituting general strain in Manson-Coffin equation .

结果表明，在较高的总应变幅下，合金首先发生循环应变硬化而后则发生软化直至断裂，而在低的总应变幅下则表现为循环稳定。

At higher strain amplitudes , the alloy exhibits cyclic strain hardening followed by softening while a stable cyclic stress response is shown at low strain amplitudes .

由于压缩应变保持和拉－压应变保持的介入，合金的疲劳寿命将显著降低，但拉伸应变保持对疲劳寿命的影响则取决于总应变幅。

A significant reduction in fatigue life is observed with hold time in compression or in both tension and compression . The influence of tensile hold on fatigue life is mainly related to the imposed total strain amplitudes .

单个引物扩增总带数变幅为7～12条，扩增多态性带数变幅为5～11条。

Single primer created 7-12 total bands and 5-11 polymorphic bands .