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On the predictive capabilities of non-local models for ductilecrack propagation under different levels of stress triaxiality

  • Ductile materials are used in many applications such as hydrogen storage andtransport, energy plants and additively manufactured components. High safetystandards are vital for such applications, which underline the necessity of thor-oughly investigating ductile failure to ensure safety and increase componentsefficiency. Ductile failure is mainly prompted by the evolution of the so-calledductile damage, characterized by the nucleation, growth and coalescence ofmicrovoids due to plastic deformation. Moreover, the plastic zones formed at thecrack tip of ductile materials exhibit high sensitivity to the stress triaxiality level,which in turn distinctly depends on the geometry of the considered component.The quantification of the stress triaxiality at the crack tip is therefore essential tobetter understand and predict ductile crack propagation and failure. For that rea-son, a non-local ductile damage model is employed in this work to simulate theductile crack propagation under different stress triaxiality conditions. DifferentgeometriesDuctile materials are used in many applications such as hydrogen storage andtransport, energy plants and additively manufactured components. High safetystandards are vital for such applications, which underline the necessity of thor-oughly investigating ductile failure to ensure safety and increase componentsefficiency. Ductile failure is mainly prompted by the evolution of the so-calledductile damage, characterized by the nucleation, growth and coalescence ofmicrovoids due to plastic deformation. Moreover, the plastic zones formed at thecrack tip of ductile materials exhibit high sensitivity to the stress triaxiality level,which in turn distinctly depends on the geometry of the considered component.The quantification of the stress triaxiality at the crack tip is therefore essential tobetter understand and predict ductile crack propagation and failure. For that rea-son, a non-local ductile damage model is employed in this work to simulate theductile crack propagation under different stress triaxiality conditions. Differentgeometries are considered, such as constrained geometries of notched bendingspecimens and unconstrained geometries of center cracked tension specimens,which characterize the different triaxiality levels. To address the effects of thick-nessandinitialcracklength,three-dimensionalgeometriesaresimulated,whichaccount for the out-of-plane crack-tip constraints. Finally, to evaluate the predic-tion quality of the simulations, corresponding experiments have been carried outand direct comparisons are conducted, with respect to the crack length, ductilecrack propagation and resistance curves.show moreshow less

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Metadaten
Author: Omar El KhatibORCiD, Rinh-Dinh Pham, Geralf HütterORCiD, Andreas SeupelORCiD, Bjoern KieferORCiD
URL:https://onlinelibrary.wiley.com/doi/10.1002/pamm.202300274
DOI:https://doi.org/10.1002/pamm.202300274
ISSN:1617-7061
Title of the source (English):Proceedings in applied mathematics and mechanics : PAMM
Document Type:Scientific journal article peer-reviewed
Language:English
Year of publication:2023
Contributing Corporation:TU Bergakademie Freiberg
Tag:crack tip constraint; ductile crack propagation; fracture mechanics; nonlocal GTN model
Volume/Year:23
Issue number:4
Comment:
93rd Annual Meeting of the International Association of Applied Mathematics and Mechanics (GAMM), December 2023
Article number:e202300274
Way of publication:Open Access
Faculty/Chair:Fakultät 6 Architektur, Bauingenieurwesen und Stadtplanung / FG Baumechanik und Numerische Methoden
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