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研究了 30 0 M钢飞机起落架外筒内螺纹根部圆角滚压强化对疲劳性能的影响 ,并利用 X射线应力分析仪 ,扫描电镜 ( SEM)及透射电镜 ( TEM) ,分析了螺级滚压强化机制。研究结果表明 ,滚压强化后疲劳强度极限 ( σ0 .1从 2 5 0 MPa提高到 448MPa,提高幅度达 79%。
The effects of the rounding of the internal thread root rounds on the fatigue properties of the 30 O M steel landing gear outer cylinder were studied. The fatigue properties were analyzed by X-ray stress analyzer, scanning electron microscope (SEM) and transmission electron microscope (TEM) Pressure intensification mechanism. The results show that the fatigue strength limit (σ0.1) increases from 205 MPa to 448 MPa after rolling, and the increase rate is up to 79%.