Rain-flow fatigue damage for transformed Gaussian loads
Igor Rychlik and Sayan Gupta
Centre for Mathematical Sciences
Lund Institute of Technology,
Fatigue damage due to a special class of non-Gaussian broadband loadings
is considered. Specifically, the loadings are considered to be non-monotonic
transformation of stationary, Gaussian random processes. A linear damage
accumulation rule is assumed and the rain-flow cycle counting method is
considered. Analytical expressions are developed for estimating the expected
rain-flow fatigue damage. Easy to compute approximations, in terms of the
upper bounds for the expected rain-flow fatigue damage, have been developed.
The proposed method has been demonstrated through a set of illustrative numerical
examples. The method developed is of use in estimating the time variant
reliability of ageing structures under random dynamic loadings.
expected fatigue damage, rain-flow cycle counting, non-Gaussian process,