Modelling of TMF Crack Initiation in Smooth Single-Crystal Superalloy Specimens
2014 (English)Conference paper (Refereed)
In this paper the TMF crack initiation behaviour of the single-crystal nickel-base superalloyMD2 is investigated and modelled. TMF tests were performed in both IP and OP for varying mechanicalstrain ranges in the  crystallographic direction until TMF crack initiation was obtained. Acrystal plasticity-creep model was used in conjunction with a critical-plane approach, to evaluate thenumber of cycles to TMF crack initiation. The critical-plane model was evaluated and calibrated ata stable TMF cycle, where the effect of the stress relaxation had attenuated. This calibrated criticalplanemodel is able to describe the TMF crack initiation, taking tension/compression asymmetry aswell as stress relaxation anisotropy into account, with good correlation to the real fatigue behaviour.
Place, publisher, year, edition, pages
Trans Tech Publications Inc., 2014. Vol. 891-892, 1283-1288 p.
single-crystal superalloy, thermomechanical fatigue, crack initiation, stress relaxation, creep, anisotropy, tension/compression asymmetry
IdentifiersURN: urn:nbn:se:liu:diva-105336DOI: 10.4028/www.scientific.net/AMR.891-892.1283ISI: 000337767700198OAI: oai:DiVA.org:liu-105336DiVA: diva2:705955
11th International Fatigue Congress (Fatigue 2014), 2-7 Mars 2014, Melbourne, Australien