Fatigue Life Prediction Method for the MgNdGdZnZr Magnesium Alloy Based on IWOA-BP
WEI Zhenwei1,2,3,4,5,*, WANG Xiaoming6, SHEN Faming6, ZHANG Genmiao7, YANG Guangshan6, CAI Zenghui6, KANG Hongyan6, LIU Changkui1,2,3,4,5
1 AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China 2 Failure Analysis Center of Aviation Industry Corporation of China, Beijing 100095, China 3 Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation, Beijing 100095, China 4 Key Laboratory of Aeronautical Science and Technology for Material Testing and Evaluation, Beijing 100095, China 5 Key Laboratory of Material Testing and Evaluation, AECC, Beijing 100095, China 6 AECC Harbin Dongan Engine Co.,Ltd., Harbin 150066, China 7 AECC Hunan Power Machinery Research Institute, Zhuzhou 412002, Hunan, China
Abstract: The fatigue properties of MgNdGdZnZr magnesium alloy were investigated at different temperatures using both the step-loading method and the group method. Four-parameter and double logarithmic S-N curve models were developed based on the experimental data. An improved whale optimization algorithm (IWOA) optimized backpropagation neural network (IWOA-BP) model was proposed for more accurate fatigue life prediction under varying temperatures and maximum stress levels. The results indicated that the median fatigue strength of the material was 165 MPa at room temperature and 66.5 MPa at elevated temperature. The goodness-of-fit for both S-N curve models ranged between 0.922 and 0.961. At the same temperature, the four-parameter model demonstrated superior fitting performance compared to the double logarithmic para-meter model. The IWOA-BP model achieved a coefficient of determination (R2) of 0.989 92, with a root mean square error (RMSE) of 0.113 56, a mean absolute error (MAE) of 0.094 846, and a mean absolute percentage error (MAPE) of 1.854 4%. Compared with the conventional BP neural network, the IWOA-BP model exhibited the highest R2 value, representing an improvement of 7.01%, while achieving the lowest RMSE, MAE, and MAPE, which were reduced by 42.76%, 25.64%, and 27.82%, respectively.
魏振伟, 王晓明, 申发明, 张根苗, 杨光山, 蔡增辉, 康洪岩, 刘昌奎. 基于IWOA-BP的MgNdGdZnZr镁合金疲劳寿命预测方法[J]. 材料导报, 2026, 40(10): 25120069-7.
WEI Zhenwei, WANG Xiaoming, SHEN Faming, ZHANG Genmiao, YANG Guangshan, CAI Zenghui, KANG Hongyan, LIU Changkui. Fatigue Life Prediction Method for the MgNdGdZnZr Magnesium Alloy Based on IWOA-BP. Materials Reports, 2026, 40(10): 25120069-7.
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