基于表面和內(nèi)部損傷的壓縮機(jī)葉片疲勞性能研究
[Abstract]:High strength steel FV520B-I is used in the manufacture of core components of large mechanical equipment, such as centrifugal compressor blades. The fatigue life of compressor blade is 10-20 years, which is analyzed as ultra-high cycle fatigue. It is found that the damage is the most obvious factor affecting the fatigue performance of ultra-high cycle, including the surface roughness and internal inclusions, which are easy to cause fatigue failure. The existence of damage reduces the fatigue strength of the material or parts, which is accompanied by the comprehensive influence of the stress ratio in the actual working conditions, which ultimately leads to the reduction of fatigue life and the occurrence of irreversible fatigue failure. Although various fatigue life prediction models and fatigue strength calculation formulas have been put forward in the field of fatigue research, and more mature theories have been established, there is no research on fatigue performance of different damage forms of FV520B-I at present. At the same time, the research on fatigue properties of FV520B-I under the influence of actual working condition parameters has not been widely carried out, which can not provide an effective research basis for theoretical research and practical application. In this paper, the fatigue life and fatigue strength of FV520B-I are studied with mature theory and fatigue experiment, and the fatigue life and fatigue strength calculation model considering surface roughness and internal inclusions are established. It provides theoretical basis for fatigue analysis and remanufacture of FV520B-I and related parts in actual working conditions, and enriches the fatigue research of FV520B-I. Based on the research background of fatigue theory, this paper first understands the achievements of fatigue research at the present stage, and clarifies the significance of FV520B-I fatigue research. Secondly, the fatigue experiment of FV520B-I is carried out, and the fatigue test data, including the stress amplitude and fatigue life, are obtained, and the stress-life curve is obtained. Based on the analysis of the fracture and surface of the specimen, the inclusion size and the surface roughness are obtained, which provides the data basis for further research. The finite element model is established on the basis of the actual condition of centrifugal compressor, and the stress distribution in the presence of fatigue crack is analyzed, which lays the foundation for the subsequent establishment of fatigue strength model. In chapter 3, the factors affecting fatigue life and fatigue strength of metal materials are analyzed according to the actual working parameters of compressor blades, and the influence mechanism of each parameter on fatigue strength is clarified. According to the classical fatigue theory, the modified parameter expression of the effect of stress ratio and size change on fatigue strength is obtained. The influence coefficient of surface roughness is tested, and the roughness coefficient of different surface roughness is determined. In the fourth and fifth chapters, the surface roughness and internal non-metallic inclusions are taken as the main research objects, respectively, and the calculation models between surface roughness and internal non-metallic inclusions, fatigue strength and fatigue life are established. A supplementary experiment was carried out to prove the accuracy of the model according to the influence of surface roughness. Furthermore, the specific values of the stress ratio, hydrogen element and other influencing parameters are determined according to the actual operating condition parameters. The fatigue strength and fatigue life are calculated under the condition of internal non-metallic inclusions, and the applicability of the fatigue strength calculation model is verified.
【學(xué)位授予單位】:大連理工大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2016
【分類號】:TH45
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