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An experimental evaluation fatigue life of unnotched rail specimen under random vibration fatigue analysis.

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Title: An experimental evaluation fatigue life of unnotched rail specimen under random vibration fatigue analysis.
Authors: Padzi, Mahfodzah Md1 (AUTHOR), Tawfik, Muhammad Nur1 (AUTHOR) tawfik.badruddin@s.unikl.edu.my, Abdullah, Shahrum2 (AUTHOR), Harmanto, Dani3 (AUTHOR), Saniman, Muhammad Nur Farhan1 (AUTHOR), Firdaws, Mohd Nur4 (AUTHOR)
Source: Australian Journal of Mechanical Engineering. Jul2026, Vol. 24 Issue 3, p420-430. 11p.
Subjects: Fatigue life, Random vibration, Power spectra, Distribution (Probability theory), Rayleigh model, Modal analysis, Fatigue testing machines
Abstract: The aim of this paper is to propose a prediction of the vibration fatigue life in frequency domain utilising newly methods that considers the vibration-load sequences effect under random vibration loading. The design of experiment employed a modal analysis to examine the vibration responses signals of R260 steel in loading ranges 300–800 MPa, however three specimens selected with different size capacity of stresses of 350 MPa, 687 MPa and 750 MPa. The vibration signals are transformed from time domain to frequency domain using power spectral density through pwelch tool. To address the stress amplitude probability distribution, each vibration responses signal uses the rain-flow counting method to analysis every minimum and maximum peaks. The fatigue life of random vibration loading was investigated through two frequency domain approaches namely Dirlik and Rayleigh distribution. The results of fatigue life of Dirlik indicate that through (g2/psd) such as 0.031, 0.16 and 0.65 it exhibits the lower fatigue life prediction with 695,000, 39,000 and 450 cycles respectively, compared to Rayleigh with 750,000, 41,000 and 750 cycles for three specimens with different size capacity loading. This work gives high accuracy and a good practical for predicting model to contribute in vibration fatigue topic for academic. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:The aim of this paper is to propose a prediction of the vibration fatigue life in frequency domain utilising newly methods that considers the vibration-load sequences effect under random vibration loading. The design of experiment employed a modal analysis to examine the vibration responses signals of R260 steel in loading ranges 300–800 MPa, however three specimens selected with different size capacity of stresses of 350 MPa, 687 MPa and 750 MPa. The vibration signals are transformed from time domain to frequency domain using power spectral density through pwelch tool. To address the stress amplitude probability distribution, each vibration responses signal uses the rain-flow counting method to analysis every minimum and maximum peaks. The fatigue life of random vibration loading was investigated through two frequency domain approaches namely Dirlik and Rayleigh distribution. The results of fatigue life of Dirlik indicate that through (g2/psd) such as 0.031, 0.16 and 0.65 it exhibits the lower fatigue life prediction with 695,000, 39,000 and 450 cycles respectively, compared to Rayleigh with 750,000, 41,000 and 750 cycles for three specimens with different size capacity loading. This work gives high accuracy and a good practical for predicting model to contribute in vibration fatigue topic for academic. [ABSTRACT FROM AUTHOR]
ISSN:14484846
DOI:10.1080/14484846.2025.2575254