一个全面的非线性多轴生命预测模型
Zegang Tian1, Yongbao Liu1, Ge Xia1
1College of Power Engineering, Naval University of Engineering, Wuhan 430033, China.
Materials (Basel, Switzerland)
|September 13, 2025
概括
用新的多轴模型改进了压缩机叶片疲劳寿命预测. 该模型考虑了应力梯度和增强效应,比关键工程元件的现有方法提供更高的准确性.
科学领域:
- 机械工程 机械工程
- 材料科学 材料科学 材料科学
- 疲劳分析 疲劳分析
背景情况:
- 压缩机叶片在操作过程中经历复杂的多轴负载条件.
- 单轴疲劳寿命预测方法对压缩机叶片等组件产生重大错误.
- 准确的疲劳寿命评估对于确保旋转机械的可靠性和安全性至关重要.
研究的目的:
- 开发一个先进的疲劳寿命预测模型,专门用于承受多轴负载下的压缩机叶片.
- 将应力梯度和增强效应纳入疲劳寿命预测框架.
- 与传统模型相比,提高疲劳寿命预测的准确性.
主要方法:
- 利用SWT (史密斯-沃森-托珀) 模型参数进行损坏分析和通过坐标转换确定关键平面.
- 研究了多轴疲劳裂发作和传播的微观机制.
- 采用有限元法 (FEM) 来分析临界平面上的非均应力场,并计算相当的应力梯度因子.
主要成果:
- 拟议的模型通过将计算结果与实验断裂角度进行比较,准确地预测了关键平面位置.
- 有限元分析提供了详细的应力分布,使得计算相当的应力梯度因子成为可能.
- 综合性疲劳寿命预测模型在与实验数据相比时,与SWT和Shang Deguang模型相比显示出更高的准确性.
结论:
- 开发的疲劳寿命预测模型有效地解决了压缩机叶片多轴负荷的复杂性.
- 结合应力梯度和增强效应可以显著提高预测准确度.
- 拟议的模型为评估关键压缩机叶片组件的疲劳寿命提供了更可靠的工具.
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