| 摘要: |
| 采用J积分方法建立了断裂力学有限元模型,对FGH95粉末高温合金标准紧凑拉伸(CT)试样的裂纹扩展试验结果进行了数值模拟,分析了材料的裂纹扩展规律。计算结果与试验结果吻合很好,表明了分析方法的准确性及可行性。将该方法加以拓展,建立了含有不同尺寸缺陷的粉末盘断裂力学有限元模型,并对其裂纹扩展寿命进行了评估。与传统预测方法相比,该方法将给出更为实际的结果,可应用于复杂构件裂纹扩展特性的工程分析。 |
| 关键词: 粉末冶金 裂纹扩展 应力强度因子 缺陷 涡轮盘 |
| DOI： |
| 分类号:TG115.52 |
| 基金项目: |
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| Lifing methodology of crack propagation in powder metallurgy turbine disk |
|
WEI Da-sheng, WANG Yan-rong
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Coll.of Energy and Power Engineering,Beijing Univ.of Aeronautics and Astronautics,Beijing 100083,China
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| Abstract: |
| A finite element model of fracture mechanics was established by means of J integral method,which was used to simulate the crack propagation behavior of a powder metallurgy(PM) superalloy,FGH95.Agreement of the computing results with the experimental data indicated the veracity and the feasibility of the method.The finite element model could be developed to predict the propagation life of PM turbine disk containing defects with different sizes.Comparing with conventional prediction method for propagation life,the model would give an actual value,and that could be used to estimate the crack growth characteristic of complicated component effectively in engineering analysis. |
| Key words: Powder metallurgy Crack propagation Stress intensity factor Defect Turbine disk |
