Ductile fracture of A 508 Cl 3 steel in relation with inclusion content: The benefit of the local approach of fracture and continuum damage mechanics

Batisse, R.; Bethmont, M.; Devesa, G.; Rousselier, G.

doi:10.1016/0029-5493(87)90235-4

Cited by 39 publications

(32 citation statements)

References 4 publications

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“…In this study, f 0 was considered to be the same as the volume fraction of MnS. 9,20,21) The value of f nucleation , which is obtained directly from integration of Eq. (5) using Eq.…”

Section: The Gurson-tvergaard (G-t) Constitutive Modelmentioning

confidence: 99%

“…Batisse et al 20) proposed the characteristic length to be the same as the mean spacing of MnS inclusions, and used a finite element having the same size as this characteristic length for FE analysis on a cracked specimen. However, ductile cracking in relatively clean ferrite-pearlite steels is dominated by secondary void nucleation from pearlite nodules.…”

Section: Fe Analysis Of Ductilementioning

confidence: 99%

“…11. Although a precise experimental investigation is expected to clarify the void growth and coalescence behavior, the present definition of the characteristic length is considered to be reasonable, because it is obvious from many experimental investigations [17][18][19][20][21][22][23][24] that pearlite nodules are major nucleation sites for the secondary voids.…”

Section: Effect Of Stress Triaxiality On Critical Void Volume Fractiomentioning

confidence: 99%

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Micromechanical Modeling of Ductile Crack Initiation Behavior of Two Phase Steels.

2001

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The effects of the volume fraction and the morphology of a second phase on ductile crack initiation behavior were determined by notched round bar tensile specimens using ferrite-pearlite steels which contain quite small amounts of MnS inclusions. Nominal strain to crack initiation was increased by decreasing pearlite volume fraction, and by the controlled rolling, which produces an elongated microstructure. The Gurson-Tvergaard (G-T) constitutive model was used to investigate the micromechanism of ductile crack initiation behavior. For evaluating the void nucleation strain, an axisymmetric unit cell model based on a Voronoi tessellation of the BCC lattice (V-BCC model) was applied to determine the microscopic strain inside the pearlite phase which controls secondary void nucleation. The parameter representing the volume fraction of nucleated void, f N , was evaluated by fitting the numerical solution to experimental data for nominal stress/nominal strain curves of the notched round bar specimen. It was found that steels with lower pearlite volume fractions or elongated pearlite nodules have lower f N , and the void growth rate is lower for the steels with lower f N , which requires a large amount of plastic strain for void growth. Ductile cracking was initiated in the region having the highest void volume fraction for all steels. It was shown that the critical void volume fraction for ductile crack initiation is independent of stress triaxiality, and the steels with lower f N show smaller critical void volume fractions.

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“…In this study, f 0 was considered to be the same as the volume fraction of MnS. 9,20,21) The value of f nucleation , which is obtained directly from integration of Eq. (5) using Eq.…”

Section: The Gurson-tvergaard (G-t) Constitutive Modelmentioning

confidence: 99%

Section: Fe Analysis Of Ductilementioning

confidence: 99%

Section: Effect Of Stress Triaxiality On Critical Void Volume Fractiomentioning

confidence: 99%

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Micromechanical Modeling of Ductile Crack Initiation Behavior of Two Phase Steels.

2001

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“…In this study, f 0 was considered to be the same as the volume fraction of MnS. 10,25,26) The value of f nucleation , which is obtained directly from integration of Eq. (6), depends only on e˙p eq , the equivalent plastic strain.…”

Section: Gurson-tvergaard Constitutive Modelmentioning

confidence: 99%

“…Batisse et al 25) proposed the characteristic length to be the same as the mean spacing of MnS inclusions, and finite elements having the same size as this characteristic length were used for FE analysis on a cracked specimen. In the case of notched round bar specimens, the center of the specimen has a high triaxial stress state similar to a crack tip region, though the notch tip region has low stress triaxiality and high equivalent plastic strain.…”

Section: Finite Element Analysismentioning

confidence: 99%

Micromechanism of Ductile Crack Initiation in Structural Steels Based on Void Nucleation and Growth.

2000

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The effect of the specimen geometry and the inclusion content on the critical condition for ductile crack initiation was determined using notched round bar tensile specimens, and the critical void volume fraction and secondary void nucleation effect were investigated using the Gurson-Tvergaard constitutive model. It is shown that the secondary void nucleation from pearlite nodules plays a dominant role in ductile crack initiation, and void nucleation and void growth behavior are strongly affected by the stress triaxiality and the plastic strain. In the large plastic strain and low stress triaxiality region, a large number of secondary voids were nucleated in the early stage of deformation and void volume fraction grew to a critical value in spite of the relatively low void growth rate at low stress triaxiality. On the other hand, in the low plastic strain and high triaxial stress region, void volume can grow rapidly even though the volume of secondary nucleated void was smaller than that of high plastic strain region. Critical void volume fraction decreases largely with increasing in MnS content in the high triaxial stress region; however, the effect of MnS content is small in the low stress triaxiality and large plastic strain region.

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Prediction of macroscopic damage behaviour of precipitation strengthened steels via multiscale simulations

et al. 2015

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A multiscale modelling approach is presented that sequentially connects in total five simulation methods via parameter transfers in order to capture the macroscopic damage behaviour due to an underlying nano structure of copper precipitates in bcc iron. In this multiscale approach, information on precipitation states is taken from kinetic Monte‐Carlo and Phasefield simulations as well as from experimental data. Based on a calibration of Dislocation Dynamics by Molecular Dynamics simulations as well as on testing conditions known from experiments, Dislocation Dynamics simulations with an infinite dislocation on a single glide plane provide strengthening levels which are related to a reference stress‐strain curve obtained from experiments. Subsequently, the macroscopic damage behaviour is simulated with the Finite‐Element‐Method including the Rousselier Damage Model for the reference state as well as for the virtually aged states. The results are validated by comparison with experimental results and predictions are made with respect to specific precipitation cases. (© 2015 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Ductile fracture of A 508 Cl 3 steel in relation with inclusion content: The benefit of the local approach of fracture and continuum damage mechanics

Cited by 39 publications

References 4 publications

Micromechanical Modeling of Ductile Crack Initiation Behavior of Two Phase Steels.

Micromechanical Modeling of Ductile Crack Initiation Behavior of Two Phase Steels.

Micromechanism of Ductile Crack Initiation in Structural Steels Based on Void Nucleation and Growth.

Prediction of macroscopic damage behaviour of precipitation strengthened steels via multiscale simulations

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