An integrated creep-fatigue theory for material damage modeling

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Proceedings titleKey Engineering Materials
Conference13th International Conference on Fracture and Damage Mechanics, FDM 2014, September 23-25, 2014
Pages341344; # of pages: 4
SubjectAlgorithms; Cracks; Creep; Grain boundaries; Nucleation; Polycrystalline materials; Cobalt-base superalloys; Creep-fatigue interactions; Damage evolution equation; Life predictions; Material damage model; Oxidation mechanisms; Thermo-mechanical loading; Fatigue damage
AbstractThis paper presents an integrated creep-fatigue (ICF) theory to describe the non-linear creep-fatigue interaction during thermo-mechanical loading. The ICF theory recognizes the damage evolution as a holistic process consisting of nucleation and propagation of surface or subsurface cracks in coalescence with internally distributed damage, leading to final fracture. In a polycrystalline material under combined cyclic and dwell loading, crack nucleation and propagation occurs by fatigue or oxidation mechanisms, whereas internally distributed damage often occurs in the form of grain boundary cavities or microcracks due to creep or dwell effects, particularly at high temperatures. Based on the above mechanism, a damage evolution equation is mathematically derived, and the generality of the above physical mechanisms warrants the applicability of the ICF theory over a wide range of stresses and temperatures. This paper uses Mar-M 509, a cobalt base superalloy, as an example to illustrate how the ICF theory describes creep and low cycle fatigue (LCF).
Publication date
PublisherTrans Tech Publications
AffiliationNational Research Council Canada; Aerospace
Peer reviewedYes
NPARC number21275796
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Record identifierbab00153-adb8-4211-b28e-1a1b08edd981
Record created2015-07-14
Record modified2016-08-19
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