Implementing the Fatigue Damage Spectrum and Fatigue Damage Equivalent Vibration Testing

Abstract

In this paper, a type of response spectra in which fatigue damage is the ordinate is reviewed. Computation of this Fatigue Damage Spectrum (FDS) in both the time and frequency domains is discussed. The method of Fatigue Damage Equivalent vibration Testing (FDET) is discussed using the FDS as the measure of environment severity. Improvements in each technique over previous work are introduced and the concepts are presented in a unified fashion. Efficient computation of the various elements involved in the FDS and FDET is discussed and examples are given.