The fatigue function test is the one that to examine resist burst function on the change force. It's basis engineering component design which the fatigue limit by test.

疲劳性能试验检验材料在交变载荷作用下抵抗破断能力的一种试验，其试验的疲劳极限作为工程构件的设计依据。

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On the basis of fatigue test under high-low two stresses loading, the paper testifies that the equivalent damage lines do not parallel each other and tend to converge slightly over the fatigue limit.

本文根据高低二级应力作用下的疲劳寿命试验，验证了等损伤线互不平行且向下汇聚。

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