Buy article PDF
The purchased file will be sent to you
via email after the payment is completed.
US$ 35
|
Structural Engineering and Mechanics Volume 73, Number 4, February25 2020 , pages 455-462 DOI: https://doi.org/10.12989/sem.2020.73.4.455 |
|
|
|
Method using XFEM and SVR to predict the fatigue life of plate-like structures |
||
Zhansi Jiang and Jiawei Xiang
|
||
| Abstract | ||
| The hybrid method using the extended finite element method (XFEM) and the forward Euler approach is widely employed to predict the fatigue life of plate structures. Due to the accuracy of the forward Euler approach is determined by a small step size, the performance of fatigue life prediction of the hybrid method is not agreeable. Instead the forward Euler approach, a prediction method using midpoint method and support vector regression (SVR) is presented to evaluate the stress intensity factors (SIFs) and the fatigue life. Firstly, the XFEM is employed to calculate the SIFs with given crack sizes. Then use the history of SIFs as a function of either number of fatigue life cycles or crack sizes within the current cycle to build a prediction model. Finally, according to the prediction model predict the SIFs at different crack sizes or different cycles. Three numerical cases composed by a homogeneous plate with edge crack, a composite plate with edge crack and center crack are introduced to verify the performance of the proposed method. The results show that the proposed method enables large step sizes without sacrificing accuracy. The method is expected to predict the fatigue life of complex structures. | ||
| Key Words | ||
| XFEM; support vector regression; stress intensity factor; crack growth rate; fatigue life prediction | ||
| Address | ||
| Zhansi Jiang: School of Mechanical and Electrical Engineering, Guilin University of Electronic Technology, Guilin, 541004, China Jiawei Xiang: College of Mechanical & Electrical Engineering, Wenzhou University, Wenzhou, 325035, China | ||