Failure mechanisms and damage model of ductile cast iron under low-cycle fatigue conditions

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DOIResolve DOI: http://doi.org/10.1007/s11661-014-2468-x
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TypeArticle
Journal titleMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
ISSN1073-5623
Volume45
Issue11
Pages50855097; # of pages: 13
SubjectCracks; Creep; Failure (mechanical); Plasticity; Strain rate; Creep-fatigue interactions; Damage accumulation; Ductile cast irons; Fatigue-crack nucleation; Intergranular embrittlement; Low cycle fatigues; Rate-independent plasticities; Time-dependent creeps; Fatigue damage
AbstractStrain-controlled low-cycle fatigue (LCF) tests were conducted on ductile cast iron (DCI) at strain rates of 0.02, 0.002, and 0.0002/s in the temperature range from room temperature to 1073 K (800 °C). A constitutive-damage model was developed within the integrated creep-fatigue theory (ICFT) framework on the premise of strain decomposition into rate-independent plasticity and time-dependent creep. Four major damage mechanisms: (i) plasticity-induced fatigue, (ii) intergranular embrittlement (IE), (iii) creep, and (iv) oxidation were considered in a nonlinear creep-fatigue interaction model which represents the overall damage accumulation process consisting of oxidation-assisted fatigue crack nucleation and propagation in coalescence with internally distributed damage (e.g., IE and creep), leading to final fracture. The model was found to agree with the experimental observations of the complex DCI-LCF phenomena, for which the linear damage summation rule would fail.
Publication date
PublisherSpringer International Publishing
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); Aerospace
Peer reviewedYes
NPARC number21272839
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Record identifierde7923f2-952d-4209-a440-76459ff5179c
Record created2014-12-03
Record modified2016-05-09
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