Vibration Fatigue Test Acceleration Factor Under Broadband Random Excitation: Analytical Modeling and Experimental Validation

IF 3.2 2区材料科学 Q2 ENGINEERING, MECHANICAL

Fatigue & Fracture of Engineering Materials & Structures Pub Date : 2025-07-25 DOI:10.1111/ffe.70040

Jiachen Sun, Yi Liu, Piao Li, Weixing Yao

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引用次数: 0

Abstract

The vibration fatigue tests of engineering structures performed under real loading conditions are time-consuming and expensive. In order to reduce the vibration fatigue test time, a novel analytical random vibration fatigue acceleration model under broadband excitation is proposed in this paper. The multi-peak response stress spectrum is divided into several single-peak spectra with only one peak in each segment. The Rayleigh model is used to fit the stress amplitude probability distribution. The concept of scale factor is introduced and the scale factor of each divided single-peak stress spectrum is calculated according to the probability density function. The acceleration factor is obtained based on the scale factor. The random vibration fatigue tests of 2024-T3 and 7075-T6 aluminum-alloy specimens with elliptical and slot holes were performed and the vibration fatigue lives were obtained under different load spectra. It is demonstrated that the results calculated by the presented model are in sound agreement with the test results.

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宽带随机激励下振动疲劳试验加速度系数：分析建模与实验验证

在实际荷载条件下进行的工程结构振动疲劳试验既耗时又昂贵。为了缩短振动疲劳试验时间，提出了一种新的宽带激励下的解析随机振动疲劳加速度模型。将多峰响应应力谱划分为多个单峰谱，每段只有一个峰。采用瑞利模型拟合应力幅值概率分布。引入尺度因子的概念，根据概率密度函数计算各划分单峰应力谱的尺度因子。加速度因子由比例因子得到。对2024-T3和7075-T6铝合金椭圆孔和槽孔试样进行了随机振动疲劳试验，获得了不同载荷谱下的振动疲劳寿命。结果表明，该模型计算结果与试验结果吻合较好。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Fatigue & Fracture of Engineering Materials & Structures 工程技术-材料科学：综合

CiteScore

6.30

自引率

18.90%

发文量

256

审稿时长

4 months

期刊介绍： Fatigue & Fracture of Engineering Materials & Structures (FFEMS) encompasses the broad topic of structural integrity which is founded on the mechanics of fatigue and fracture, and is concerned with the reliability and effectiveness of various materials and structural components of any scale or geometry. The editors publish original contributions that will stimulate the intellectual innovation that generates elegant, effective and economic engineering designs. The journal is interdisciplinary and includes papers from scientists and engineers in the fields of materials science, mechanics, physics, chemistry, etc.