3D-Simulation of ductile failure in two-phase structural steel with heterogeneous microstructure

Ohata, Mitsuru; Suzuki, Masanori; Ui, Anna; Minami, Fumiyoshi

doi:10.1016/j.engfracmech.2009.08.011

Cited by 37 publications

(18 citation statements)

References 10 publications

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“…Figure 11a shows the equivalent stressσ -equivalent plastic strainε p curves for the ferrite and pearlite phases and that for the two-phase steel. The accuracy of this assumption has been verified by demonstrating that the stress-strain curve of the twophase steel could be reproduced by using 3D heterogeneous model together with the stress-strain curves of each phase (Ohata et al 2010b). …”

Section: Strength Property Of Each Phasementioning

confidence: 96%

“…11 Mechanical properties of the constituent phases of the two-phase steel needed for damage simulation, a Equivalent stress-equivalent plastic strain curves, b Stress triaxiality dependent ductility with/without circumferential notch. Ductile cracking found to be controlled by damage evolution mainly in the softer ferrite phase (Ohata et al 2010b). As for the pearlite phase, the damage parameters were assumed to be the same as those for the two-phase steel, because no significant effect of the damage parameters of pearlite phase on simulated result was found in this case.…”

Section: Damage Property Of Each Phasementioning

confidence: 99%

“…One is critical local strain that controls shear-slip mode ductile crack initiation from notch/crack-tip, and the other is stress triaxiality dependent ductility that controls subsequent ductile crack growth with equi-axed dimple mode. On the other hand, as the meso-scopic approach, we have developed a simulation method to predict strength properties and ductile cracking limit of two-phase steel from the microstructural characteristics that are micro-structural morphology and mechanical properties of each constituent phase (Ohata et al 2007(Ohata et al , 2010b. Then, it was demonstrated that the meso-scopic approach could simulate ductile cracking behavior not only with shear-slip mode but also with equi-axed dimple mode (Ohata et al 2013).…”

Section: Introductionmentioning

confidence: 98%

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Simulation-based method for hierarchal material design to improve ductile crack growth resistance of structural component

2015

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The purpose of this study is to propose a method to correlate micro-structural characteristics of two-phase steel with structural performance in terms of ductile crack growth resistance (R-curve). For this purpose, a meso-scopic simulation method is proposed to predict two types of ductile properties of two-phase steel that control the R-curve from micro-structural characteristics. The R-curve of three-point bend specimen with fatigue pre-crack predicted by a macro-scopic simulation method that we have proposed, in which these two types of ductile properties obtained by the proposed meso-scopic methods are implemented, is in good agreement with experimental result.

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Section: Strength Property Of Each Phasementioning

confidence: 96%

Section: Damage Property Of Each Phasementioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

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Simulation-based method for hierarchal material design to improve ductile crack growth resistance of structural component

2015

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“…It is still challenging to understand the comprehensive mechanism of the strengthening effects in steels. To predict only macroscopic material responses, it is possible to illustrate the macroscopic stress-strain curve of a duplex steel from the stress-strain curves of single-constituent steels (Ohata et al 2010), where strengthening microstructural characteristics, e.g. grain size, dislocation density, alloy elements and so on, must be aligned almost equal between the two constituents in the objective duplex steel and the single-constituent steels to eliminate these underlying strengthening effects at the finer scale.…”

mentioning

confidence: 99%

Maximization of Strengthening Effect of Microscopic Morphology in Duplex Steels

Watanabe

Nakamura

Yuge

et al. 2015

Advanced Structured Materials

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An inverse analysis method based on nonlinear finite element analysis is developed to find an optimized morphology of periodic microstructure for improving the macroscopic mechanical properties in duplex elastoplastic solids. Here a gradient-based computational optimization method and two types of homogenization methods are employed. In this study, the optimization problem is defined as the maximization of the sum of macroscopic external works for several macroscopic deformation modes, enabling us to obtain a high strength material. The morphologic strengthening effect is discussed through a comparison with experiments and classical theories.

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“…Ohata et al developed a two-phase polycrystalline FE model together with a damage model for the simulation of microvoid formation and subsequent interaction followed by ductile cracking. In their simulation, the grain boundaries were omitted and the focus was mainly on the different phases [12].…”

Section: Introductionmentioning

confidence: 99%

Microstructure Modelling of Dual-Phase Steel Using SEM Micrographs and Voronoi Polycrystal Models

Katani

Ziaei-Rad

Nouri

et al. 2013

Metallogr. Microstruct. Anal.

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The microstructure of dual-phase (DP) steels is composed of a matrix of ferrite reinforced by islands of martensite and the common interphase boundaries. To study the mechanical behavior of DP steels, steel with 45% ferrite and 55% martensite was fabricated and tested in the laboratory. Two types of finite element models were then created based on SEM images. The first model directly created the grains and boundaries from the SEM images, while the second model used a Voronoi type algorithm to construct geometries which are statistically similar to the SEM images. The models consider the measured morphology of ferrite, martensite, and their phase boundaries. The Gurson damage model was then used for the ferrite and boundary regions. The obtained results correctly predicted the failure mechanisms in a DP material. The results indicate that the deformation is localized due to microstructural inhomogeneities and the nucleation of voids in the boundaries between the ferrite and martensite grains. The good correlation between the numerical and experimental observations from SEM micrographs shows the efficiency of the proposed models in predicting the failure mechanism of DP steels.

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3D-Simulation of ductile failure in two-phase structural steel with heterogeneous microstructure

Cited by 37 publications

References 10 publications

Simulation-based method for hierarchal material design to improve ductile crack growth resistance of structural component

Simulation-based method for hierarchal material design to improve ductile crack growth resistance of structural component

Maximization of Strengthening Effect of Microscopic Morphology in Duplex Steels

Microstructure Modelling of Dual-Phase Steel Using SEM Micrographs and Voronoi Polycrystal Models

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