Fatigue Estimation based on Stress RMS under Stochastic Excitation

2019 International Conference on Advanced Electronic Materials, Computers and Materials Engineering

无线电电子学;计算机科学;材料科学

Peng, Xiaojing^1

AVIC China Aero-Polytechnology Establishment, Beijing, Province

100028, China^1

关键词: Critical location;    Engineering applications;    Experimental test;    Fatigue estimation;    Fatigue failures;    Root Mean Square;    Stochastic excitations;    Stochastic vibration;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/563/4/042058/pdf
DOI  :  10.1088/1757-899X/563/4/042058

来源: IOP

【 摘 要 】

The thesis presents a case study of fatigue estimation based on stress response root mean square under stochastic excitation. The cantilever beam with a hole is subjected to a stochastic vibration test firstly, during which measured the time history of stress at critical locations using strain gauges. Then the characteristics of measured locations' stress response RMS is discussed and the stress RMS curve of fatigue failure location is fitted. Finally, fatigue estimation is taken out based upon the stress RMS curve compared with experimental test life. The result indicates that it is practical to use stress RMS to estimate fatigue life under stochastic excitation, providing a method for fatigue analysis in engineering applications.