Beschreibung:
<jats:p>Fatigue life prediction of structural elements subjected to cyclic loading is
usually performed using S-N curves, obtained from the experimental data from
fatigue tests. However, in some cases the samples do not exhibit failure,
due to reaching the predetermined number of cycles, failure of a
non-relevant segment or terminating the test because of some other reason.
These samples are usually referred to as runouts, and the data obtained from
them could be used for determination of S-N curves as well. In this paper,
the algorithm based on Maximum Likelihood method is proposed for the
determination of S-N curves from experimental data that contain runouts.
Following the algorithm, a MATLAB code was written and the verification was
performed using the experimental data from the literature. The results
showed that it could be successfully used for taking into account the
runouts in the process of determination of S-N model parameters. It was
concluded that the inclusion of runouts could significantly influence the
predicted fatigue life, especially at the lower stress levels.</jats:p>