低周-超高周复合循环疲劳实验及寿命模型研究

Complex cyclic fatigue is a widespread form of fatigue failure in gas turbine blades and pressure vessel components. In this paper, stainless steel S310 was used as the research material, and low-cycle fatigue tests, ultra-high-cycle fatigue tests, and low-cycle - ultra-high-cycle complex cyclic fatigue tests were carried out respectively. Based on the fatigue test results and damage accumulation theory, a prediction method for low-cycle - ultra-high-cycle complex cyclic fatigue life was proposed. Through the comparison of multiple sets of data with several complex cyclic fatigue life prediction models, it was found that the model proposed in this paper has a relatively small average error and dispersion in the prediction of complex cyclic fatigue life.

复合循环疲劳是燃气轮机叶片和压力容器构件广泛存在的一种疲劳破坏形式。本文以不锈钢S310为研究材料,分别进行了低周疲劳实验、超高周疲劳实验、低周-超高周复合循环疲劳实验,并基于疲劳实验结果和损伤累积理论提出了低周-超高周复合循环疲劳寿命预测方法。通过多组数据与多个复合循环疲劳寿命预测模型的对比,发现本文所提模型在复合循环疲劳寿命预测中具有较小的平均误差和分散性。