Detail publikace
Fatigue lifetime predictions of notched specimens based on the critical distance and stress concentration factors
KOZÁKOVÁ, K. KLUSÁK, J.
Anglický název
Fatigue lifetime predictions of notched specimens based on the critical distance and stress concentration factors
Typ
článek v časopise ve Web of Science, Jimp
Jazyk
en
Originální abstrakt
The theory of critical distances is used for evaluation of effects of notches on load-bearing capacity of notched components under static or cyclic fatigue loading. The theory can also be used to predict the fatigue life of notched components. One of the assumptions for a reliable prediction is that the critical distance is independent of the notch geometry and its stress concentration level. The study shows that the critical distance depends not only on the number of cycles to failure (under fatigue loading), but also on the notch radius. In this case, direct use of the critical distance leads to unreliable predictions. The study quantifies the relation between the model notch (from which the critical distance is determined) and the predicted notch by means of the ratio of their stress concentration factors. The predictions modified by the ratio of stress concentration factors provide results that are in satisfactory agreement with the experimental data. The predictions were made and verified on the basis of fatigue data measured on two stainless steels 1.4306 and 1.4307, and high strength structural steel S690QL. Smooth and notched specimens were tested on an ultrasonic fatigue machine in a symmetrical tension-compression mode. The results were evaluated in the regions of high cycle and very high cycle fatigue.
Anglický abstrakt
The theory of critical distances is used for evaluation of effects of notches on load-bearing capacity of notched components under static or cyclic fatigue loading. The theory can also be used to predict the fatigue life of notched components. One of the assumptions for a reliable prediction is that the critical distance is independent of the notch geometry and its stress concentration level. The study shows that the critical distance depends not only on the number of cycles to failure (under fatigue loading), but also on the notch radius. In this case, direct use of the critical distance leads to unreliable predictions. The study quantifies the relation between the model notch (from which the critical distance is determined) and the predicted notch by means of the ratio of their stress concentration factors. The predictions modified by the ratio of stress concentration factors provide results that are in satisfactory agreement with the experimental data. The predictions were made and verified on the basis of fatigue data measured on two stainless steels 1.4306 and 1.4307, and high strength structural steel S690QL. Smooth and notched specimens were tested on an ultrasonic fatigue machine in a symmetrical tension-compression mode. The results were evaluated in the regions of high cycle and very high cycle fatigue.
Klíčová slova anglicky
Fatigue of notches; Theory of critical distances; Stress concentration factors; Very high cycle fatigue; Lifetime predictions
Vydáno
04.07.2024
Nakladatel
ELSEVIER
Místo
AMSTERDAM
ISSN
0167-8442
Ročník
133
Číslo
104579
Počet stran
11
BIBTEX
@article{BUT193838,
author="Kamila {Kozáková} and Jan {Klusák},
title="Fatigue lifetime predictions of notched specimens based on the critical distance and stress concentration factors",
year="2024",
volume="133",
number="104579",
month="July",
publisher="ELSEVIER",
address="AMSTERDAM",
issn="0167-8442"
}