Novel analytical model for fatigue cumulative damage estimation under random loading

• Type: Article in International Scientific Journal
• Date: 2019

Authors

Rui Miranda Guedes (Author) FEUP

Journal

Title: Fatigue & Fracture of Engineering Materials & Structures

Vol. 42 No. 8

Pages: 1662-1678

ISSN: 8756-758X

Publisher: Wiley-Blackwell

Indexing

ISI Web of Knowledge - 3 Citations

Scopus - 4 Citations

INSPEC

Other information

Authenticus ID: P-00Q-ETT

DOI: 10.1111/ffe.13007

Abstract (EN): A newly nonlinear cumulative damage model associated with the S-N curve, which preserves the compatibility conditions established for S-N plane, was proposed and assessed by Eskandari and Kim in 2015. The model requires one exponent, in addition to the S-N curve, to calculate the residual strength. A methodology is established to determine analytically the lower bound value of the exponent. However, this value proved to be too low for a quasi-isotropic glass-fibre laminate, based on published residual strength data. Further on, good predictions are obtained for ascending and descending ordered block spectrum. Yet it failed at fully random spectrum. The model was modified by imposing a very small decrease on model exponent towards the lower bound value, each time an increase in peak stress occurs. This modified model has been found to give good agreement with fatigue experimental data at different spectrum loads.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 17