这一试验方法是模拟日常使用情况下，沙发对长期重复性载荷的承受能力。
This test method is to simulate everyday use, the sofa on the long-term repeatability of the load bearing capacity.
某舰的螺旋桨尾轴长期处在恒定载荷作用下，虽然尾轴应力在弹性极限范围内，但是尾轴局部还是很容易发生微量的塑性变形。
Tiny deformation will appear in the local of the propeller shaft of certain ship which is endured an invariableness load, although the shaft stress is within the elastic limit range.
对于那些长期经受交变载荷作用的机械零件和工程构件，疲劳破坏是一种主要的破坏模式。
Fatigue damage is the main destroy mode for the machinery parts and engineering structures under alternate loading over a long period of time.
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