上海交通大学学报 ›› 2026, Vol. 60 ›› Issue (3): 511-521.doi: 10.16183/j.cnki.jsjtu.2024.090

• 航空航天 • 上一篇    

基于时空神经网络的金属疲劳裂纹扩展预测

梁佳铭, 余音(), 胡祎乐   

  1. 上海交通大学 航空航天学院;民机结构强度综合实验室, 上海 200240
  • 收稿日期:2024-03-15 修回日期:2024-05-09 接受日期:2024-05-21 出版日期:2026-03-28 发布日期:2026-03-30
  • 通讯作者: 余 音,教授,博士生导师,电话(Tel.):021-34206640;E-mail:yuyin@sjtu.edu.cn
  • 作者简介:梁佳铭(1999—),硕士生,从事疲劳裂纹扩展研究.
  • 基金资助:
    国家自然科学基金(U2241266)

Prediction of Fatigue Crack Growth in Metal Materials via Spatiotemporal Neural Network

LIANG Jiaming, YU Yin(), HU Yile   

  1. School of Aeronautics and Astronautics; Lab of Civil Aircraft Structures Testing, Shanghai Jiao Tong University, Shanghai 200240, China
  • Received:2024-03-15 Revised:2024-05-09 Accepted:2024-05-21 Online:2026-03-28 Published:2026-03-30

摘要:

提出一种基于时空神经网络(STNN)的图像驱动模型,基于铝合金材料疲劳试验,开展了裂纹扩展预测研究.设计了边裂纹、0° 裂纹角度试验件,进行了15.0%极限载荷水平的疲劳试验.通过数字图像相关(DIC)设备拍摄试件变形图片,得到5 511帧位移场图像.对获得的试验图像数据进行了插值、数据增强和维度转换等,构建了STNN的数据集.分别利用卷积长短期记忆(Conv-LSTM)和SimVP两种STNN方法进行了疲劳裂纹扩展的预测,计算了其结构相似度指标(SSIM)和均方根误差(RMSE),比较了两种方法的预测准确性.结果表明,SimVP神经网络在测试阶段的预测效果更好,该方法可以准确预测疲劳裂纹扩展速率和路径,为损伤容限分析和结构监测周期的确定提供参考.

关键词: 时空神经网络, 图像驱动, 疲劳裂纹扩展, 疲劳试验, 数字图像相关

Abstract:

An image-driven model based on spatiotemporal neural network (STNN) is proposed for prediction of crack growth in aluminum alloy. Fatigue experiments with an initial edge crack angle of 0° and a 15.0% limit load level are designed, and images of specimen deformation are captured using digital image correlation (DIC) resulting in 5 511 frames of displacement field data used as datasets of STNN after interpolation, augmentation, and dimension-raising. Two neural netwroks, convolutional long short-term memory (Conv-LSTM) and SimVP, are employed to predict the fatigue crack growth, with their prediction accuracies further compared based on the structural similarity index measure (SSIM) and the root mean square error (RMSE). The results show that the SimVP neural network performs better in the test stage predicting fatigue crack growth rate and propagation path. This method provides a reference for damage tolerance analysis and determination of inspection intervals for structures.

Key words: spatiotemporal neural network (STNN), image driven, fatigue crack growth, fatigue experiment, digital image correlation (DIC)

中图分类号: