Probabilistic fatigue assessment of notched components under size effect using generalized weakest-link model

• Type: Article in International Scientific Journal
• Date: 2022

Authors

Zhu, SP (Author) Other; Wu, YL (Author) Other; Yi, XJ (Author) Other; Fu, SC (Author) Other; Correia, JAFO (Author) FEUP

Journal

Title: International Journal of Fatigue

Vol. 162

ISSN: 0142-1123

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 0 Citations

Scopus - 0 Citations

Other information

Authenticus ID: P-00W-MGR

DOI: 10.1016/j.ijfatigue.2022.107005

Abstract (EN): Fatigue assessment in the presence of intricate geometries is critical for ensuring reliability and structural integrity of engineering components. This study proposes a generalized weakest-link model for probabilistic life prediction of notched components considering statistical and geometrical size effects, in which the failure probability of materials at different positions is quantified by a weight function of stress field intensity (SFI) approach. In particular, with a new definition of fatigue failure region (FFR), the size effect on notch fatigue behavior is reasonably characterized. Model validation and comparison are performed with experimental data of GH4169 and TC4 notched specimens. Note that the scattering fatigue data points agree well with the model predicted P-S-N curves. Finally, the proposed generalized weakest-link model is applied to fatigue strength assessment of a turbine bladed disk.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 11