Correlation between NiTi inclusions and fatigue: multivariate analysis of rotary bending fatigue

In this work we propose the preliminary results of a statistical analysis aimed at evaluating the correlation between superelastic fatigue performance and material microstructure, in particular the dimension and area fraction of inclusions. Fatigue performances are evaluated by means of rotary bending tests. As fatigue can be influenced not only by inclusions but by many other material parameters, and in particular functional parameters like plateau stresses, a multivariate approach is needed in order to discriminate their contribution. In particular, Partial Least Square Regression is chosen for this task.

In this presentation the Partial Least Square method will be briefly introduced, the collected data will be described and statistical analysis results discussed.