Effects of non-proportionality and tension–compression asymmetry on the fatigue life prediction of equivalent stress criteria

verfasst von

Michael Kuhn, Nikolas Manousides, Alexandros Antoniou, Claudio Balzani

Abstract

Biaxial tension/compression–torsion fatigue tests with varying levels of non-proportionality were performed employing a structural adhesive designed for wind turbine rotor blades. The cycles to failure were found to be independent of the level of non-proportionality. It is demonstrated that numerical fatigue life predictions via rainflow-counted equivalent stress histories are not able to replicate these experimental observations and overestimate the fatigue life up to a hundredfold. The tension–compression asymmetry of the adhesive resulted in significant damage prediction differences depending on the stress space representation of the Haigh diagram. If not properly taken care of, the asymmetry will also lead to non-conservative results. While demonstrated with a short fiber-reinforced adhesive, the results can be transferred to other materials.

Organisationseinheit(en)

Institut für Windenergiesysteme

Externe Organisation(en)

Fraunhofer-Institut für Windenergiesysteme (IWES)

Typ

Artikel

Journal

Fatigue and Fracture of Engineering Materials and Structures

Band

46

Seiten

3161-3178

Anzahl der Seiten

18

ISSN

8756-758X

Publikationsdatum

10.08.2023

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Werkstoffwissenschaften (insg.), Werkstoffmechanik, Maschinenbau

Ziele für nachhaltige Entwicklung

SDG 7 – Erschwingliche und saubere Energie

Elektronische Version(en)

https://doi.org/10.1111/ffe.14065 (Zugang: Offen)