压力容器2024，Vol.41Issue(3)：1-7,40,8.DOI:10.3969/j.issn.1001-4837.2024.03.001
CrMoV钢近门槛值区疲劳裂纹扩展评价模型准确性分析
Accuracy analysis of evaluation models for fatigue crack growth in the near-threshold regime of CrMoV steel
摘要
Abstract
The fatigue crack growth behavior in the near-threshold region and the determination of the fatigue threshold value are of great significance for the fatigue performance and damage tolerance design of engineering materials and structures.The fatigue crack growth data of 25Cr2Ni2MoV steel are used to predict the fatigue crack growth threshold using the Paris model,NASGRO model,and Zhu-Xuan model to compare the prediction errors of each model;The bilinear evaluation model developed by combining the Zhu-Xuan model with the transition point prediction model is further developed to carry out a comparison of the relative error and accuracy with the evaluation models in the ASME code and BS 7910 standard.The results show that the Zhu-Xuan model has the highest accuracy with an error of less than 10%,and the bilinear evaluation model predicts better consistency,higher accuracy and stability with the experimental data,with an improvement in accuracy of up to 28.6%.The study shows that the Zhu-Xuan model and the bilinear evaluation model have better applicability to the prediction of the threshold value and the precise evaluation of the life of CrMoV steel.关键词
CrMoV钢/疲劳裂纹扩展/Zhu-Xuan模型/双线性模型/近门槛值区/精度Key words
CrMoV steel/fatigue crack growth/Zhu-Xuan model/bilinear model/near-threshold regime/accuracy分类
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尧全恒,朱明亮,轩福贞..CrMoV钢近门槛值区疲劳裂纹扩展评价模型准确性分析[J].压力容器,2024,41(3):1-7,40,8.基金项目
国家自然科学基金项目(51922041) （51922041）
