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在飞机或发动机上,许多零件需要承受高速循环载荷,因而要求有比较高的疲劳寿命。任何一种金属材料采用不同的加工工艺或热处理方法,都会有各异的疲劳寿命。因此,当采用一种新的工艺方法,经常需要通过试验,对所加工的金属材料的疲劳寿命作出正确的判断。要解决这个问题,一般可以在疲劳试验机或振动台上进行。由于手头没有这类现成设备,而且科研任务急需,我们提出了一种气体激振疲劳寿命试验方法。它是利用压缩空气通过一种扁平的气嘴产生一股高速气流,如图1所示。当这股气流水平地吹过平板试件时,能
On aircraft or engines, many parts need to withstand high-speed cyclic loading, thus requiring a higher fatigue life. Any kind of metal materials using different processing techniques or heat treatment methods, will have different fatigue life. Therefore, when using a new process, it is often necessary to pass the test to make a correct judgment of the fatigue life of the metal material being processed. To solve this problem, the general fatigue testing machine or shaking table. Due to the lack of such ready-made equipment on hand and the urgent need for scientific research, we propose a gas-actuated fatigue life test method. It uses compressed air to create a high-speed airflow through a flat gas nozzle, as shown in Figure 1. When this air flow blows flat plate specimen, can