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A crack opening stress equation for in-phase and out-of-phase thermomechanical fatigue loading

 
: Fischer, C.; Schweizer, C.; Seifert, T.

:
Preprint urn:nbn:de:0011-n-4041878 (408 KByte PDF)
MD5 Fingerprint: 904469f31b1328ec5ae08d8a99590716
Erstellt am: 15.03.2018


International journal of fatigue 88 (2016), S.178-184
ISSN: 0142-1123
Englisch
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IWM ()
fatigue crack closure; thermomechanical fatigue; strip yield model; crack opening stress equation; constraint

Abstract
In this paper, a crack opening stress equation for in-phase and out-of-phase thermomechanical fatigue (TMF) loading is proposed. The equation is derived from systematic calculations of the crack opening stress with a temperature dependent strip yield model for both plane stress and plane strain, different load ratios and different ratios of the temperature dependent yield stress in compression and tension. Using a load ratio scaled by the ratio of the yield stress in compression and tension, the equation accounts for the effect of the temperature dependent yield stress and the constraint on the crack opening stress. Based on the scaling relation established in this paper, Newman's crack opening stress equation for isothermal loading is enabled to predict the crack opening stress under TMF loading.

: http://publica.fraunhofer.de/dokumente/N-404187.html