Micromechanics of coalescence—I. Synergistic effects of elasticity, plastic yielding and multi-size-scale voids

Faleskog, Jonas; Shih, C. F.

doi:10.1016/s0022-5096(96)00078-6

Cited by 154 publications

(86 citation statements)

References 27 publications

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“…Experimental observations and computational studies [7,10,11,14] support simplifications of the four-step failure process described above which enable development of a tractable model for use in large-scale computations. For common structural and pressure vessel steels, the nucleation of microvoids by fracture/ decohesion of the largest second-phase particles occurs at a relatively low stress, well below the peak macroscopic stress that develops ahead of the crack front.…”

Section: Metallurgical Processes and Idealizationsmentioning

confidence: 73%

Numerical modeling of ductile crack growth in 3-D using computational cell elements

1996

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Section: Metallurgical Processes and Idealizationsmentioning

confidence: 73%

Numerical modeling of ductile crack growth in 3-D using computational cell elements

1996

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“…ț Proper modeling of void coalescence and accounting for the final rupture of the intervoid ligament is necessary to correctly capture the effect of microstructure changes on the fracture toughness. More experimental and theoretical work is required to better account for damage phenomena leading to final ligament fracture, such as the growth of a second population of voids [55] or microcleavage. ț The fracture toughness (normalized by the yield stress and void spacing) significantly decreases with decreasing hardening exponent.…”

Section: Discussionmentioning

confidence: 99%

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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“…To model the rapid loss of stress carrying capacity in this final stage of material separation, a linear cell traction (reduction) vs. elongation relation is activated when the void volume fraction in a given cell reaches f E ; f E = 0.2 was used in present calculation. A discussion of the coalescence process and the resulting traction-elongation behavior can be found in Faleskog and Shih [20]. In this study, the uniaxial stress-strain behavior of both the void-free background material and the matrix material within the void-containing layer are described by the following true stresslogarithmic strain relation a…”

Section: Model For Ductile Tearingmentioning

confidence: 90%

A Fracture Model Applied to the Ductile/Brittle Regime

Xia

Shih

1996

J. Phys. IV France

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Abstract. The fracture resistance of ferritic steels in the ductilelbrittle transition regime is controlled by the competition between ductile tearing and cleavage fracture. Under typical conditions, a crack initiates and grows by ductile tearing but ultimate failure occurs by catastrophic cleavage fracture. In this paper the tearing process is simulated using void-containing cell elements embedded within a conventional elasticplastic continuum. Weakest link statistics is incorporated into the cell element model and this new model is employed to predict the onset of unstable cleavage fracture. Load-displacement behavior, ductile tearing resistance and transition to cleavage fracture are investigated for three different test geometries. The model predicts trends in ductilelbrittle transition that are consistent with experimental data.

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Micromechanics of coalescence—I. Synergistic effects of elasticity, plastic yielding and multi-size-scale voids

Cited by 154 publications

References 27 publications

Numerical modeling of ductile crack growth in 3-D using computational cell elements

Numerical modeling of ductile crack growth in 3-D using computational cell elements

Micromechanics-based model for trends in toughness of ductile metals

A Fracture Model Applied to the Ductile/Brittle Regime

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