Please use this identifier to cite or link to this item: http://hdl.handle.net/11452/29664
Title: Coupled porous porous plasticity Continuum damage mechanics approaches for modelling temperature driven ductile-to-brittle transition fracture in ferritic steels
Authors: Uludağ Üniversitesi/Mühendislik Fakültesi/İnşaat Mühendisliği Bölümü.
Türtük, İsmail Cem
Deliktaş, Babür
AAH-8687-2021
56731098900
7801344314
Keywords: Engineering
Materials science
Mechanics
Fracture mechanisms
Finite strain
Porous material
Numerical algorithms
Small punch testing
Small-punch-test
Void nucleation
Anisotropic damage
Gurson model
Deformation
Stress
Growth
Metal
Algorithms
Aluminum sheet
Brittle fracture
Concrete aggregates
Continuum damage mechanics
Cracks
Ductile fracture
Ductility
Energy dissipation
Failure (mechanical)
Ferrite
Ferritic steel
Fracture testing
Mechanics
Plasticity
Porous materials
Aluminum
Ductile to brittle transitions
Elastic formulation
Fracture experiments
Fracture mechanisms
Numerical implementation
Small punch testing
Fracture
Issue Date: 2016
Publisher: Elsevier
Citation: Türtük, İ. C. ve Deliktaş, B. (2016). "Coupled porous porous plasticity Continuum damage mechanics approaches for modelling temperature driven ductile-to-brittle transition fracture in ferritic steels". International Journal of Plasticity, 77, 246-261.
Abstract: Following; (a) the observation that micro-void and micro-crack driven failure mechanisms co-exist in metallic alloys and (b) the two damage state variable definition given in Chaboche et al. (2006), two coupled porous plasticity and continuum damage mechanics approaches to assess temperature driven ductile-to-brittle transition fracture in ferritic steels have been developed. Based on hypo-elastic formulation of Gurson-Tvergaard-Needleman (GTN) thermoplasticity to account for ductile failure following void growth, continuum damage mechanics formalism have been coupled in order to account for micro-crack driven brittle fracture. Keeping GTN thermoplasticity as a basis for ductile fracture, Leckie-Hayhurst creep rupture criterion has been modified and proposed to account for brittle damage, thus cleavage, in the first model. The second approach, which is proposed following the motivation that plasticity exists in and below the lower transition region, replaces Leckie-Hayhurst model with plasticity driven damage evolution law of Lemaitre et al. (2000). Unlike commonly used cleavage models such as Ritchie et al. (1973) and Beremin (1983), both of the proposed models have been aimed to take into account blended effects of micro-voids and micro-cracks in order to capture energy dissipation and softening accompanying and prior to brittle fracture. Numerical implementation has been done for ABAQUS/Explicit and uses staggered solution based on plastic flow-damage correction structure, while its validation has been performed modeling Small Punch Fracture Experiments for P91 ferritic steel, published by Turba et al.
URI: https://doi.org/10.1016/j.ijplas.2015.06.009
https://www.sciencedirect.com/science/article/pii/S0749641915001059
http://hdl.handle.net/11452/29664
ISSN: 0749-6419
1879-2154
Appears in Collections:Scopus
Web of Science

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