An extended model for void growth and coalescence

Pardoen, Thomas; Hutchinson, J.W.

doi:10.1016/s0022-5096(00)00019-3

Cited by 706 publications

(457 citation statements)

References 58 publications

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“…[30]. It is based on the works by Gologanu et al [31] for the account of the void aspect ratio and by Thomason [32] for the onset of coalescence with extensions to strain-hardening and for the modeling of the coalescence process [34].…”

Section: An Enhanced Model For Void Growth and Coalescencementioning

confidence: 99%

“…The first yield surface ⌽ growth is a Gurson-type yield surface derived by Gologanu-Leblond-Devaux model and extended to strain-hardening materials in Ref. [30] (see Appendix A). The yield function ⌽ coalescence has been developed in the spirit of the work by Thomason, extended to the full coalescence response and to strain-hardening.…”

Section: An Enhanced Model For Void Growth and Coalescencementioning

confidence: 99%

“…The void growth model is an extension of the Gurson [29] model proposed by Gologanu et al [31], which has been modified to account for strain-hardening [30]. It is a full constitutive model for a porous elastoplastic material containing axisymmetric spheroidal voids.…”

Section: Appendix a Enhanced Model For Void Growth And Coalescencementioning

confidence: 99%

“…From their analysis, Gologanu et al [31] derived analytical relationships for C, h, g, , h 1 , a 2 which can be expressed exclusively in terms of the state variables S and f, except for h 1 which also depends on the stress triaxiality. The heuristic parameter q depends on n, f 0 , and S in order to obtain accurate predictions towards void cells calculations (see [30] for the details about the expression of the dummy variables).…”

Section: Appendix a Enhanced Model For Void Growth And Coalescencementioning

confidence: 99%

“…The inclusion of the three points discussed before is made possible by a recent extension of Gurson's model [29] of plastic solids containing voids to include shape, coalescence and distribution effects [30] based on contributions by Gologanu et al [31] and Thomason [32].…”

Section: Introductionmentioning

confidence: 99%

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Micromechanics-based model for trends in toughness of ductile metals

2003

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Relations between fracture toughness and microstructural details have been calculated for ductile materials based on a dilatational plasticity constitutive model that has recently been proposed. The model generalizes the Gurson model to account for both void growth and coalescence with explicit dependence on void shape and distribution effects. Based on a small scale yielding formulation of crack growth, toughness trends are determined as a function of yield stress, strain-hardening, initial porosity, void shape and spacing as well as void spacing anisotropy. Distinctions are drawn between the engineering fracture toughness, which is typically associated with 0.2 mm of crack growth, and the theoretical toughness based on coalescence of the crack tip with the first void ahead of it. Comparison with one set of experimental data for a steel is made for which a fairly complete characterization of the microstructure is available.

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Section: An Enhanced Model For Void Growth and Coalescencementioning

confidence: 99%

Section: An Enhanced Model For Void Growth and Coalescencementioning

confidence: 99%

Section: Appendix a Enhanced Model For Void Growth And Coalescencementioning

confidence: 99%

Section: Appendix a Enhanced Model For Void Growth And Coalescencementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Micromechanics-based model for trends in toughness of ductile metals

2003

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Non‐linear Micro‐cracked Geomaterials: Anisotropic Damage and Coupling with Plasticity

Kondo¹,

Zhu²,

Monchiet³

et al. 2008

Multiscale Modeling of Heterogenous Materials

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Recent Advances in the Study of Structural Materials Compatibility with Hydrogen

et al. 2010

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Hydrogen is a ubiquitous element that enters materials from many different sources. It almost always has a deleterious effect on mechanical properties. In non-hydride-forming systems, research to date has identified hydrogen-enhanced localized plasticity and hydrogen-induced decohesion as two viable mechanisms for embrittlement. However, a fracture prediction methodology that associates macroscopic parameters with the degradation mechanisms at the microscale has not been established, as of yet. In this article, we report recent work on modeling and simulation of hydrogen-induced crack initiation and growth. Our goal is to develop methodologies to relate characteristics of the degradation mechanisms from microscopic observations and first-principles calculations with macroscopic indices of embrittlement. The approach we use involves finite element analysis of the coupled hydrogen transport problem with hydrogen-assisted elastoplastic deformation, thermodynamic theories of decohesion, and ab initio density functional theory calculations of the hydrogen effect on grain boundaries.

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An extended model for void growth and coalescence

Cited by 706 publications

References 58 publications

Micromechanics-based model for trends in toughness of ductile metals

Micromechanics-based model for trends in toughness of ductile metals

Non‐linear Micro‐cracked Geomaterials: Anisotropic Damage and Coupling with Plasticity

Recent Advances in the Study of Structural Materials Compatibility with Hydrogen

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