Paper published in a journal (Scientific congresses and symposiums)
Identification and validation of an extended Stewart-Cazacu micromechanics damage model applied to Ti–6Al–4V specimens exhibiting positive stress triaxialities
Finite element modeling; Micromechanics damage model;; Cazacu yield criterion; ductile fracture; hcp material
Abstract :
[en] In 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 (SEM) imaging technique. The validation procedure consists in the implementation into the finite element (FE) research software Lagamine of ULiège 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.
Disciplines :
Materials science & engineering
Author, co-author :
Rojas-Ulloa, Carlos; Universidad de La Frontera
Valenzuela, Marian
Tuninetti, Victor
Habraken, Anne ; Université de Liège - ULiège > Département ArGEnCo > Département ArGEnCo
Language :
English
Title :
Identification and validation of an extended Stewart-Cazacu micromechanics damage model applied to Ti–6Al–4V specimens exhibiting positive stress triaxialities
Publication date :
06 May 2021
Event name :
3rd International Conference of Materials Design and Applications (MDA2020)
Event organizer :
Lucas F M da Silva
Event place :
Online, Portugal
Event date :
5-6 November, 2020
Audience :
International
Journal title :
Proceedings of the Institution of Mechanical Engineers. Part L, Journal of Materials: Design and Applications
ISSN :
1464-4207
eISSN :
2041-3076
Publisher :
Professional Engineering Publishing, United Kingdom
Volume :
108
Issue :
2
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
ANID - Agencia Nacional de Investigación y Desarrollo [CL]
This work was funded by the National Agency for Research and Development (ANID) Fondecyt 11170002 and the cooperation agreement WBI/AGCID SUB2019/419031 (DIE19-0005). As research director of FRS-FNRS, A.M. Habraken thanks the Belgian Scientific Research Fund FNRS for financial support. The authors also acknowledge FONDEQUIP EQM130014.
Commentary :
University of Porto. Held online due to COVID restrictions
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