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为了研究外物损伤对航空发动机叶片疲劳性能的影响规律,将直径为3、4 mm的钢珠利用空气炮加速到约300 m/s对TC4合金平板试样进行外物损伤试验,利用3维体式显微镜和扫描电子显微镜(SEM)分别观察外物损伤的宏观特征和微观特征。结果表明:在随后的高周疲劳试验中外物损伤容易诱发疲劳裂纹的萌生,且试样的疲劳强度随损伤深度的增加而降低;疲劳源一般位于损伤区域的表面位置,因为试样在冲击过程中在损伤区域形成了微观裂纹和缺口。
In order to study the influence of foreign body damage on the fatigue performance of aeroengine blades, the steel balls with a diameter of 3,4 mm were accelerated to about 300 m / s by air cannons to test the TC4 alloy plate samples. Microscopic and scanning electron microscopy (SEM) were used to observe the macroscopic and microscopic features of foreign body injury. The results show that in the subsequent high-cycle fatigue test, the foreign body damage easily induces the initiation of fatigue crack, and the fatigue strength of the specimen decreases with the increase of the damage depth. The fatigue source is usually located on the surface of the damaged area because the impact of the specimen In the damaged area formed a micro-cracks and gaps.