No new phases are introduced into the test life cycle for NFT, but the scope of each activity is broadened to include NF requirements.

在非功能性测试的生命周期中并没有引如新的阶段，但是每一个活动的范围都变广了以此来涵盖非功能性需求。

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Fatigue life (Nf). The total number of stress cycles that will cause a fatigue failure at some specified stress amplitude.

疲劳寿命(Nf)：在某一指定应力幅值下，引起疲劳失效的应力循环总数。

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