Evaluation of notch effects in low cycle fatigue of alloy 718 using critical distances

Eriksson, Robert (författare): Linköpings universitet,Mekanik och hållfasthetslära,Tekniska fakulteten

Simonsson, Kjell (författare): Linköpings universitet,Mekanik och hållfasthetslära,Tekniska fakulteten

Leidermark, Daniel (författare): Linköpings universitet,Mekanik och hållfasthetslära,Tekniska fakulteten

Moverare, Johan (författare): Linköpings universitet,Konstruktionsmaterial,Tekniska fakulteten

(creator_code:org_t)

2018-05-25
2018
Engelska.
Ingår i: 12TH INTERNATIONAL FATIGUE CONGRESS (FATIGUE 2018). - : E D P SCIENCES.

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Abstract Ämnesord

Stäng

Gas turbine disks contain many notch-like features acting as stress raisers. The fatigue life based on the notch root stress may be overly conservative as the steep stress gradient in front of the notch may give rise to so-called notch support. In the current work, the theory of critical distances was applied to the prediction of the total fatigue life of low cycle fatigued, notched specimens made from alloy 718. The fatigue tests were performed at 450 degrees C and 550 degrees C. It was found that, for lives shorter than 5000-10000 cycles, the notched specimens had longer lives than would have been expected based on the notch root strain. For lives longer than 5000-10000 cycles, there were no notch support. The life prediction for notched specimens could be significantly improved by basing the prediction on the strain chosen some distance from the notch (the critical distance). An expression for calculating the critical distance based on the notch root strain was suggested.

Av författaren/redakt...: Eriksson, Robert; Simonsson, Kjell; Leidermark, Dani ...; Moverare, Johan

Om ämnet

TEKNIK OCH TEKNOLOGIER: TEKNIK OCH TEKNO ...; och Maskinteknik; och Energiteknik

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