A size-dependent ductile fracture model Constitutive equations, Numerical implementation and Validation - Archive ouverte HAL Access content directly
Journal Articles European Journal of Mechanics - A/Solids Year : 2018

A size-dependent ductile fracture model Constitutive equations, Numerical implementation and Validation

(1) , (1)
1

Abstract

Size effects have been predicted at the micro- or nano-scale for porous ductile materials from Molecular Dynamics, Discrete Dislocation Dynamics and Continuum Mechanics numerical simulations, as a consequence of Geometrically Necessary Dislocations or due to the presence of a void matrix interface. As voids size decreases, higher stresses are needed to deform the material, for a given porosity. However, the majority of the homogenized models for porous materials used in ductile fracture modeling are size-independent, even though micrometric or nanometric voids are commonly observed in structural materials. Based on yield criteria proposed in the literature for nanoporous materials, a size-dependent homogenized model for porous materials is proposedfor axisymmetric loading conditions, including void growth and coalescence as well as void shape effects. Numerical implementation of the constitutive equations is detailed. The homogenized model is validated through comparisons to porous unit cells finite element simulations that consider interfacial stresses, consistently with the model used for the derivation of the yield criteria, aiming at modeling an additional hardening at the void matrix interface. Potential improvements of the model are finally discussed with respect to the theoretical derivation of refined yield criteria and evolution laws.
Fichier principal
Vignette du fichier
S0997753818309215.pdf (1.28 Mo) Télécharger le fichier
Origin : Files produced by the author(s)

Dates and versions

cea-02339712 , version 1 (22-10-2021)

Licence

Attribution - NonCommercial - CC BY 4.0

Identifiers

Cite

Jm. Scherer, J. Hure. A size-dependent ductile fracture model Constitutive equations, Numerical implementation and Validation. European Journal of Mechanics - A/Solids, 2018, ⟨10.1016/j.euromechsol.2019.03.014⟩. ⟨cea-02339712⟩

Collections

CEA DEN
32 View
10 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More