Random vibration fatigue life prediction considering the effects of multi-axial stress and resonance

被引：0

作者：

Bai J. ^{[1
]}

Li J. ^{[1
]}

Qiu Y. ^{[1
]}

Sheng Y. ^{[1
]}

Sun H. ^{[1
]}

Wang H. ^{[2
]}

Wang Z. ^{[2
]}

机构：

[1] School of Electromechanical Engineering, Xidian University, Xi'an

[2] Shanghai Spaceflight Precision Machinery Research Institute, Shanghai

来源：

Qiu, Yuanying (yyqiu@mail.xidian.edu.cn) | 1600年 / National University of Defense Technology卷 / 43期

关键词：

Fatigue life; Multi-axis S-N curve; Multi-axis vibration factor; Random vibration; Triaxial factor;

D O I：

10.11887/j.cn.202102014

中图分类号：

学科分类号：

摘要：

In calculating random fatigue life of structures in engineering at present, the stress life method based on the axial tension-compression fatigue life S-N(stress-number of cycles) curve is often used. Easy as it is to use, it often ignores not only the single-axis S-N curve, causing inaccurate reflection of the effect of multi-axial stress state, but also the resonance on the structure fatigue life in random vibration, as a result, the method in the prediction of fatigue life of structures under random vibration with actual life tends to have a larger error. The triaxial factor was introduced to reflect the multi-axial stress state of the structure under random vibration, and its expression in frequency domain was generalized. Based on this, the multi-axial vibration factor, a new random vibration fatigue damage parameter, was proposed. The new damage parameter not only considers the effect of multi-axial stress state and resonance on fatigue life under random vibration of the structure, but also has a simple form for engineering application. By using the new random vibration fatigue damage parameters, the multi-axis S-N curve for random vibration was obtained, and a new random vibration fatigue life prediction method was established. By predicting the random vibration fatigue life of 7075-T6 and LY12CZ aluminum alloy notch specimen, the results show that the method can accurately predict the fatigue life of two kinds of notch specimens under random vibration. © 2021, NUDT Press. All right reserved.

引用

页码：102 / 108

页数：6

共 24 条

[1] Crandall S H, MARK W D., Random vibration in mechanical systems, (1963)
[2] JIANG PEI, ZHANG Chunhua, CHEN XUN, Et al., Fatigue enhancement mechanism of the broadband random vibration environment, Journal of National University of Defense Technology, 27, 1, pp. 26-29, (2005)
[3] YAO Qihang, YAO Jun, Vibration fatigue of engineering structures, Chinese Journal of Applied Mechanics, 23, 1, pp. 12-15, (2006)
[4] WANG Mingzhu, The fatigue life analysis of structure vibration, (2009)
[5] WANG Jinli, LI Yulong, HU Haitao, Et al., Effect of load frequency on vibration fatigue behavior of cantilever beam, Journal of Vibration and Shock, 30, 6, pp. 243-247, (2011)
[6] SOCIE D F., Multiaxial fatigue damage models, Journal of Engineering Materials and Technology, Transactions of the ASME, 109, 4, pp. 293-298, (1987)
[7] FATEMI A, SOCIE D F., A critical plane approach to multiaxial fatigue damage including out-of-phase loading, Fatigue & Fracture of Engineering Materials & Structures, 11, 3, pp. 149-165, (1988)
[8] SHANG D G, SUN G Q, DENG J, Et al., Multiaxial fatigue damage parameter and life prediction for medium-carbon steel based on the critical plane approach, International Journal of Fatigue, 29, 12, pp. 2200-2207, (2007)
[9] LI J, QIU Y Y, LI C W, Et al., Prediction of fatigue life under multiaxial loading by using a critical plane-based model, Archive of Applied Mechanics, 89, 4, pp. 629-637, (2018)
[10] ZHAO W, BAKER M J., On the probability density function of rainflow stress range for stationary Gaussian processes, International Journal of Fatigue, 14, 2, pp. 121-135, (1992)

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