某压气机叶片断裂分析疲劳失效分析
Fracture analysis of a compressor blade and fatigue failure analysis
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摘要: 某叶片从榫头断裂，根据要求，对16号叶片及其对应榫槽进行断口分析、材质检查及痕迹分析等工作，结果表明，叶片材质及金相组织均未见异常，硬度符合要求，（1）16号四级转子叶片断裂性质为高周疲劳，有多个疲劳区，。主疲劳源位于榫头与榫齿配合面上边缘，距卡环槽后端面约2.5mm，距榫头底面约4.9mm，为源区为短线源，。疲劳裂纹的萌生与榫头侧面微动损伤有关。（2）；叶片榫头与榫槽配合面上边缘附近银层不完整，金属基体表面有砂粒残留，榫头与榫槽配合紧，这些因素都会恶化表面接触状态，造成局部微动损伤。Abstract: A blade is fractured from the tenon, and according to the requirements, the fracture analysis, material inspection and trace analysis of the No. 16 blade and its corresponding tenon groove are carried out, and the results show that (1) The fracture nature of the No. 16 fourth-stage rotor blade is high-cycle fatigue, and there are multiple fatigue zones. The main fatigue source is located at the edge of the matching surface of the tenon and tenon, about 2.5mm away from the rear surface of the snap ring groove and about 4.9mm away from the bottom surface of the tenon, which is a short-line source. The initiation of fatigue cracks is related to the fretting damage of the side of the tenon. (2) The silver layer near the edge of the matching surface of the blade tenon and tenon groove is incomplete, there are sand residues on the surface of the metal matrix, and the tenon and tenon groove fit tightly, all these factors will deteriorate the surface contact state and cause local fretting damage. (3) There was no abnormality in the metallographic structure of the blade, and the hardness met the requirements.
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Keywords:
- fracture analysis /
- material inspection /
- trace analysis /
- Material checks /
- Trace analysis /
- Fretting wear
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