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Home  >  Journal list  >  Journal of the Society of Materials Science, Japan  >  Vol.57  No.12 (2008)  >  pp.1186-1190

Journal of the Society of Materials Science, Japan
<<Previous article Vol.57  No.12 (2008)   pp.1186 - 1190 Next article>>

Fatigue Life Evaluation under Service Loading by Frequency Domain Method

Akito ITO1), Naoya NISHIMURA2), Toshio HATTORI2), Norio TAKEDA3) and Yasuki KITA3)
1) Dept. of Mech. and Systems Eng., Gifu Univ.
2) Dept. of Mech. and Systems Eng., Gifu Univ.
3) Mech. Eng. Res. Lab., Hitachi Ltd.


In design of a structure in consideration of the fatigue life, it is very important to evaluate not only a fatigue life under the constant loading but also a fatigue life under the service loading. Generally, a fatigue life prediction by the rainflow method is used when a service loading condition is given as a wave form (we call this as time domain information). However, recently we sometimes experienced that the service loading condition is given only as the frequency domain information such as power spectrum density (PSD) of dynamic load.
In this paper, firstly we present the investigated results of the fatigue life estimation by using service loading with frequency domain information. Then fatigue tests are also carried out by using the round bar specimens under several service loading conditions. Finaly, these fatigue lives estimated by using frequency domain information are compared with the estimated results by using time domain information. We can confirmed that These both estimated results coincided well with the experimental results, and this fatigue life estimation method using frequency domain information is effective in the standardized fatigue life evaluation of structures.


Keyword:
Service loads, Fatigue life, Time domain information, Frequency domain information, Dirlik's method

Received: April 23, 2008
Published online: December 19, 2008
Copyright (c) 2008 by The Society of Materials Science, Japan

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