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  2023, Vol. 44 Issue (4): 470-482    DOI: 10.19636/j.cnki.cjsm42-1250/o3.2022.042
  研究论文 本期目录 | 过刊浏览 | 高级检索 |
临界距离法在铝锂合金多轴缺口疲劳寿命预测中的应用
龚帅1, 王文轩1, 王英玉1, 姚卫星1, 游文2
1. 南京航空航天大学飞行器先进设计技术国防重点学科实验室
2. 西南铝合金加工研究所
Application of Theory of Critical Distance in Multiaxial Notch Fatigue Life Prediction for Al-Li Alloy
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摘要 临界距离法以缺口根部附近区域某点、线、面或体上的应力特征值作为描述材料失效的参量,具有较好的物理意义。本文进行了2297铝锂合金缺口件的疲劳实验,然后介绍了适用于多轴缺口疲劳寿命预测的名义应力法和临界距离法,将临界距离定义为与疲劳寿命相关的函数,借助临界面法给出有效临界面多轴应力比的定义,并对W?hler曲线中的相关参数进行修正。最后,本文应用临界距离法预测了带有不同几何形状缺口试件的多轴疲劳寿命,并与名义应力法的预测结果对比,结果表明,临界距离法的预测精度更高,有92%预测数据点在三倍误差分散带内。
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龚帅
王文轩
王英玉
姚卫星
游文
关键词 多轴疲劳缺口寿命预测临界距离法铝锂合金     
Abstract:The complex stress states at the notch roots on engineering components are usually caused by combinations of geometric discontinuities and multiaxial loading. As to the Theory of Critical Distance, the stress eigenvalue of a point, line or area near the notch root is used as the control parameter of fatigue failure, and a reasonable explanation for the notch effect is put forward. Therefore, the Theory of Critical Distance is considered to be a method of engineering application prospects for predicting the fatigue life of notched specimens. In this paper, the multiaxial fatigue life of notched specimens is predicted according to the Theory of critical distance. Firstly, fatigue tests carried out on 2297 Al-Li alloy under uniaxial and 90° non-proportional loading paths are introduced. Subsequently, the Nominal Stress Approach and the Theory of Critical Distance for multiaxial fatigue life prediction are elaborated. In particular, the value of the critical distance is determined by defining the function relationship between critical distance and fatigue life. The stress state in the vicinity of notch is then analyzed by the finite element method. With the obtained stress state, it is easy to determine the position of the critical plane by the shear stress-Maximum Variance Method. According to the stress parameters on the critical plane, the critical plane stress ratio is defined. Afterwards, the W?hler curve under multiaxial loading is modified by the critical plane stress ratio. Finally, the Theory of Critical Distance and Nominal Stress Approach are used to estimate the multiaxial fatigue life of 2297 Al-Li alloy, and the predicted results are compared. It is found that the Theory of Critical Distance combined with the Modified W?hler Curve Method has high calculation accuracy, for 92% of the predicted data points are in the triple error dispersion band. Compared with the Nominal Stress Approach, the calculation process of the Theory of Critical Distance is not complicated and the results are more reliable.
Key wordsmultiaxial fatigue    notch    life estimation    Theory of Critical distance    Al-Li alloy
收稿日期: 2022-07-29      出版日期: 2023-08-18
基金资助:国家自然科学基金
通讯作者: 王英玉     E-mail: yywang@nuaa.edu.cn
引用本文:   
龚帅,王文轩,王英玉, 姚卫星,游文. 临界距离法在铝锂合金多轴缺口疲劳寿命预测中的应用[J]. , 2023, 44(4): 470-482.
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