Identification and validation of an extended Stewart-Cazacu micromechanics damage model applied to Ti-6Al-4V specimens exhibiting positive stress triaxialities

dc.creatorRojas-Ulloa, Carlos
dc.creatorValenzuela, Marian
dc.creatorTuninetti, Victor
dc.creatorHabraken, Anne-Marie
dc.date2021
dc.date2021-10-04T18:54:31Z
dc.date2021-10-04T18:54:31Z
dc.date.accessioned2022-10-18T14:53:17Z
dc.date.available2022-10-18T14:53:17Z
dc.identifierPROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART L-JOURNAL OF MATERIALS-DESIGN AND APPLICATIONS,Vol.235,1248-1261,2021
dc.identifierhttp://repositoriodigital.uct.cl/handle/10925/4325
dc.identifier10.1177/14644207211009933
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/4444392
dc.descriptionIn this research, the Stewart-Cazacu micromechanics coupled damage model is extended and validated adding nucleation and coalescence models as new damage mechanisms. The Ti-6Al-4V titanium alloy is chosen as a suitable hcp ductile material to be modeled using this extended damage law. The characterization of the damage evolution in this alloy is addressed throughout a quasi-static experimental campaign. Damage characterization relies on in situ X-ray tomography data and scanning electron microscopy imaging technique. The validation procedure consists in the implementation into the finite element research software Lagamine of ULiege and in the comparison of numerical predictions and experimental results. Load-displacement curves and damage-related state variables at fracture configuration from smooth and notched bar specimens submitted to tensile tests are analyzed. The nucleation and coalescence model extensions as well as an accurate elastoplastic and damage material parameter identification for Ti-6Al-4V samples are essential features to reach a validated model. The prediction capabilities exhibited for large strains are in good agreement with experimental results, while the near-fracture strains can still be improved.
dc.languageen
dc.publisherSAGE PUBLICATIONS LTD
dc.sourcePROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART L-JOURNAL OF MATERIALS-DESIGN AND APPLICATIONS
dc.subjectFinite element modeling
dc.subjectmicromechanics damage model
dc.subjectCazacu yield criterion
dc.subjectductile fracture
dc.subjecthcp material
dc.subjectcoupled damage law
dc.titleIdentification and validation of an extended Stewart-Cazacu micromechanics damage model applied to Ti-6Al-4V specimens exhibiting positive stress triaxialities
dc.typeArticle


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