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Assessment of fatigue crack closure under in-phase and out-of-phase thermomechanical fatigue loading using a temperature dependent strip yield model

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

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International journal of fatigue 78 (2015), pp.22-30
ISSN: 0142-1123
English
Journal Article
Fraunhofer IWM ()
fatigue crack closure; thermomechanical fatigue; strip yield model; lifetime prediction

Abstract
In this paper fatigue crack closure under in-phase and out-of-phase thermomechanical fatigue (TMF) loading is studied using a temperature dependent strip yield model. It is shown that fatigue crack closure is strongly influenced by the phase relation between mechanical loading and temperature, if the temperature difference goes along with a temperature dependence of the yield stress. In order to demonstrate the effect of the temperature dependent yield stress, the influence of in-phase and out-of-phase TMF loading is studied for a polycrystalline nickel-base superalloy. By using a mechanism based lifetime model, implications for fatigue lives are demonstrated.

: http://publica.fraunhofer.de/documents/N-352033.html