Effect of a single overload on the cyclic R-curve behaviour of a γ-TiAl TNM alloy

Arthur Lintner; Reinhard Pippan; Martin Schloffer; Anton Hohenwarter

doi:10.1016/j.ijfatigue.2022.107083

Effect of a single overload on the cyclic R-curve behaviour of a γ-TiAl TNM alloy

Arthur Lintner, Reinhard Pippan, Martin Schloffer, Anton Hohenwarter

Lehrstuhl für Materialphysik (430)

Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Begutachtung

Abstract

The effect of single overloads on the threshold of stress intensity range of a semi-brittle material, a γ-titanium aluminide, was analysed. This material class exhibits a pronounced R-curve behaviour, which is mainly caused by the formation of shear ligaments, crack deflection and branching. Samples with short cracks on deep sharp notches were subjected to overloads of 80 % of the fracture toughness. Contrary to ductile materials, the experiments revealed no significant increase in the long-crack threshold, however a pronounced increase in the slope of the R-curve for the threshold of stress intensity range.

Originalsprache	Englisch
Aufsatznummer	107083
Seitenumfang	8
Fachzeitschrift	International Journal of Fatigue
Jahrgang	163.2022
Ausgabenummer	October
Frühes Online-Datum	23 Juni 2022
DOIs	https://doi.org/10.1016/j.ijfatigue.2022.107083
Publikationsstatus	Veröffentlicht - Okt. 2022

Bibliographische Notiz

Funding Information:
The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: Arthur Lintner reports financial support was provided by MTU Aero Engines AG. Martin Schloffer reports a relationship with MTU Aero Engines AG that includes: employment.

Publisher Copyright:
© 2022 The Authors

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abstract = "The effect of single overloads on the threshold of stress intensity range of a semi-brittle material, a γ-titanium aluminide, was analysed. This material class exhibits a pronounced R-curve behaviour, which is mainly caused by the formation of shear ligaments, crack deflection and branching. Samples with short cracks on deep sharp notches were subjected to overloads of 80 % of the fracture toughness. Contrary to ductile materials, the experiments revealed no significant increase in the long-crack threshold, however a pronounced increase in the slope of the R-curve for the threshold of stress intensity range.",

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