TY - JOUR

T1 - Effect of a single overload on the cyclic R-curve behaviour of a γ-TiAl TNM alloy

AU - Lintner, Arthur

AU - Pippan, Reinhard

AU - Schloffer, Martin

AU - Hohenwarter, Anton

N1 - Publisher Copyright: © 2022 The Authors

PY - 2022/10

Y1 - 2022/10

N2 - 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.

AB - 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.

KW - Fatigue threshold

KW - Overload

KW - R-curve

KW - Titanium aluminide

UR - http://www.scopus.com/inward/record.url?scp=85132729142&partnerID=8YFLogxK

U2 - 10.1016/j.ijfatigue.2022.107083

DO - 10.1016/j.ijfatigue.2022.107083

M3 - Article

AN - SCOPUS:85132729142

VL - 163.2022

JO - International Journal of Fatigue

JF - International Journal of Fatigue

SN - 0142-1123

IS - October

M1 - 107083

ER -