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http://dx.doi.org/10.7736/KSPE.2013.30.2.231

The Prediction of Dynamic Fatigue Life of Multi-axial Loaded Structure  

Yoon, Moon Young (Department of Mechanical Engineering, Inje Univ.)
Kim, Kyeung Ho (Department of Mechanical Engineering, Inje Univ.)
Park, Jang Soo (Keyang Electronic Machinery Co.)
Boo, Kwang Seok (High Safety Vehicle Core Technology Research Center, Inje Univ.)
Kim, Heung Seob (High Safety Vehicle Core Technology Research Center, Inje Univ.)
Publication Information
Journal of the Korean Society for Precision Engineering / v.30, no.2, 2013 , pp. 231-235 More about this Journal
Abstract
The purpose of this paper is to compare with estimation of equivalent fatigue load in time domain and frequency domain and estimate the fatigue life of structure with multi-axial vibration loading. The fatigue analysis with two methods is implemented with various signals like random, sinusoidal signals. Also an equivalent fatigue life estimated by rainflow cycle counting in time domain is compared with results estimated with probability density function of each signal in frequency domain. In case of frequency domain, equivalent fatigue life can estimate through Dirlik's method with probability density function. And the work proposed in this paper compared the fatigue damage accumulated under uni-axial loading to that induced by multi-axial loading. The comparison is preformed for a simple cantilever beam, which is exposed to vibrations of several directions. For verification of estimation performance of fatigue life, results are compared to those of FEM analysis (ANSYS).
Keywords
Dirlik's Method; Power Spectral Density; Fatigue Analysis; Probability Density Function;
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