按照ASTM,B771-11（2017）.Standard Test Method for Short Rod Fracture Toughness of Cemented Carbides标准进行实验。在MTS810疲劳试验机上进行实验，控制加载速率为0.0025mm/s，实验过程中需对试样进行两次卸载再加载过程。每次卸载持续到载荷减少至卸载开始时载荷的10%为止。具体卸载情形为：当位移-载荷曲线的斜率为初始加载斜率的70%时开始第一次卸载，卸载完成后立马加载；当位移-载荷曲线的斜率为初始加载斜率的35%时开始第二次卸载，卸载完成后立马加载，直至试样断裂，后用扫描电镜观察断口。

The experiment was carried out in accordance with ASTM, B771-11 (2017). Standard Test Method for Short Rod Fracture Toughness of Cemented Carbides. The experiment was carried out on the MTS810 fatigue testing machine, and the loading rate was controlled to 0.0025mm/s. During the experiment, the sample should be unloaded and reloaded twice. Each unloading continues until the load is reduced to 10% of the load at the beginning of unloading. The specific unloading situation is: the first unloading starts when the slope of the displacement-load curve is 70% of the initial loading slope, and the load is immediately after the unloading is completed; the second starts when the slope of the displacement-load curve is 35% of the initial loading slope After unloading, load immediately after unloading, until the sample breaks, and then observe the fracture with scanning electron microscope.