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某型风扇叶片工作后在凸肩工作面发现裂纹,断口分析后判断为疲劳裂纹,起始于盆侧凸肩工作面下侧靠近尖部边缘。建立凸肩工作面接触模型,分析了凸肩工作面挤压应力分布和位移变形,并对其压痕和磨痕进行了检查。结果表明:裂纹起始位置存在局部挤压应力集中。由于叶片工作载荷和凸肩初始紧度导致的凸肩变形错位而形成不均匀接触;同时凸肩工作面的初始装配错位和边缘倒角较小进一步加剧了裂纹起始位置的挤压应力集中程度,较大地局部挤压应力导致凸肩工作面耐磨涂层在工作过程中出现微裂纹,进而形成初始裂纹,在振动应力作用下,最终扩展到基体。
A type of fan blade working face cracks found in the shoulder, fracture analysis of the judge as a fatigue crack, starting from the lower side of the basin side shoulder shoulder near the edge. The contact model of shoulder face was established, the extrusion stress distribution and displacement deformation of shoulder face were analyzed, and indentation and wear marks were inspected. The results show that local compressive stress concentration exists at the crack initiation location. Due to the working load of the blade and the shoulder initial deformation caused by the deformation of the shoulder deformation and uneven contact formation; , The greater local compressive stress causes the wear-resistant coating on the shoulder face to develop micro-cracks during the working process, and then the initial crack is formed, finally expanding to the matrix under the action of vibration stress.