组合结构金属波纹管的低周疲劳寿命分析

Low Cycle Fatigue Life Analysis of Composite Structure Metal Bellows

建立扁圆锥壳–圆弧–圆环板组合结构波纹管模型,应用有限元分析工程软件,结合波纹管在机械密封系统中的实际工况进行低周疲劳寿命分析。在静力学分析的基础上借助Fatigue Tool模块进行疲劳寿命分析,得出组合结构波纹管的倾角增大会降低波纹管的整体刚度,疲劳寿命随着倾角的增大而减少。在热–结构耦合模型上进行疲劳寿命分析,发现倾角越大对于温差的改变越敏感,在同温差条件下最小疲劳寿命下降的幅度越大。研究为波纹管的结构优化设计提供参考。

Combined with the actual working condition of bellows in mechanical seal system, the composite structure metal bellows model is established. The low cycle fatigue life was analyzed by finite element software. Based on the static analysis, fatigue life analysis is carried out with the help of the Fatigue Tool module. It is concluded that the overall stiffness of the combined structure bellows will be reduced with the increase of the inclination angle, and the fatigue life will decrease with the increase of the inclination Angle. Fatigue life analysis was carried out on the thermal-structural coupling model, and it was found that the larger the inclination angle was, the more sensitive it was to the change of temperature difference, and the greater the range of the minimum fatigue life decreased under the condition of the same temperature difference. The research provides a reference for the structural optimization design of bellows.