Slip systems interactions in α-iron determined by dislocation dynamics simulations

Queyreau, Sylvain; Monnet, Ghiath; Devincre, Benoît

doi:10.1016/j.ijplas.2007.12.009

Cited by 126 publications

(80 citation statements)

References 39 publications

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“…Effects of strain rates on the (a) yield strength; (b) strain hardening modulus of a bulk Fe pillar under tension test. the present study clearly show the elastic and strain hardening regions but the stress strain relationship of a Fe pillar obtained by Queyreau et al 54 is unable to identify its elastic and strain hardening regions.…”

Section: Resultscontrasting

confidence: 85%

“…Up to a certain time creep rate of a bulk Fe pillar increases and then it decreases. Stress strain relationship of a Fe pillar at a strain rate 2000s -1 is compared with that of Queyreau et al 54 as shown in Fig. 13(a) and agrees well each other.…”

Section: Resultssupporting

confidence: 80%

“…13(a) and agrees well each other. The dislocation density of a Fe pillar at a strain rate 2000s -1 obtained by us is higher than that of Queyreau et al 54 From the comparative study it is clear that the stress strain relationship of a Fe pillar under tension obtained by FIG. 11.…”

Section: Resultscontrasting

confidence: 61%

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Mechanical properties of nano and bulk Fe pillars using molecular dynamics and dislocation dynamics simulation

Nath

2017

AIP Advances

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Using molecular dynamics simulation, tension and bending tests of a Fe nanopillar are carried out to obtain its Young’s modulus and yield strength. Then the comparative study of Young’s modulus and yield strength of a Fe nanopillar under bending and tension are carried out varying its diameter in the range of diameter 1-15nm. We find out the reasons why bending Young’s modulus and yield strength of a Fe nanopillar are higher than those of tension Young’s modulus and yield strength of a Fe nanopillar. Using the mobility parameters of bulk Fe from the experimental study [N. Urabe and J. Weertman, Materials Science and Engineering 18, 41 (1975)], its temperature dependent stress-strain relationship, yield strength and strain hardening modulus are obtained from the dislocation dynamics simulations. Strain rate dependent yield strength and strain hardening modulus of bulk Fe pillars under tension are studied. Temperature dependent creep behaviors of bulk Fe pillars under tension are also studied. To verify the soundness of the present dislocation dynamics studies of the mechanical properties of bulk Fe pillars under tension, the stress vs. strain relationship and dislocation density vs. strain of bulk Fe pillars obtained by us are compared with the published results obtained by S. Queyreau, G. Monnet, and B. Devincre, International Journal of Plasticity 25, 361 (2009).

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Section: Resultscontrasting

confidence: 85%

Section: Resultssupporting

confidence: 80%

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Mechanical properties of nano and bulk Fe pillars using molecular dynamics and dislocation dynamics simulation

Nath

2017

AIP Advances

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“…The mechanical steady state is assumed to be reached at the 10th simulated cycle, N sta , for each loading amplitude. The slip matrix coefficient h i have been chosen in agreement with recent studies which mention a strong latent hardening on collinear systems [22,23]. The parameters obtained are presented in table 1.…”

Section: Materials Parameters Identificationmentioning

confidence: 99%

Numerical investigations of the free surface effect in three-dimensional polycrystalline aggregates

Guilhem

Basseville

Curtit³

et al. 2013

Computational Materials Science

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The aim of the present paper is to investigate the consequences of the loading on the free surface response in polycrystalline aggregates. The study is made on a 316L stainless steel. Finite element computations using a crystal plasticity model are performed to simulate a polycrystalline aggregate submitted to different cyclic loadings. A statistical analysis of the results is carried out to extract information concerning the local stress and local strain fields at the free surface. The analysis of plastic strain localization on surface maps and inside the bulk through transparent volumetric views allows to exhibit the effects of the grain orientation and of the loading on local mechanical fields. The computation of an indicator characterizing extrusion/intrusion steps give some information on the initiation sites.

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“…where τ p is the Peierls stress; τ pass is the passing stress, defined as a function of the shear modulus μ, the local dislocation densities ρ α , and the interaction parameters ξ αα that characterize the interaction strength between slip systems α and α as a result of the possible interaction types self, coplanar, collinear, mixed-asymmetrical junction (orthogonal), mixedsymmetrical junction (glissile) and edge junction (sessile) [65]:…”

Section: Dislocation Velocity Functionmentioning

confidence: 99%

Linking atomistic, kinetic Monte Carlo and crystal plasticity simulations of single‐crystal tungsten strength

et al. 2015

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Understanding and improving the mechanical properties of tungsten is a critical task for the materials fusion energy program. The plastic behavior in body‐centered cubic (bcc) metals like tungsten is governed primarily by screw dislocations on the atomic scale and by ensembles and interactions of dislocations at larger scales. Modeling this behavior requires the application of methods capable of resolving each relevant scale. At the small scale, atomistic methods are used to study single dislocation properties, while at the coarse‐scale, continuum models are used to cover the interactions between dislocations. In this work we present a multiscale model that comprises atomistic, kinetic Monte Carlo (kMC) and continuum‐level crystal plasticity (CP) calculations. The function relating dislocation velocity to applied stress and temperature is obtained from the kMC model and it is used as the main source of constitutive information into a dislocation‐based CP framework. The complete model is used to perform material point simulations of single‐crystal tungsten strength. We explore the entire crystallographic orientation space of the standard triangle. Non‐Schmid effects are inlcuded in the model by considering the twinning‐antitwinning (T/AT) asymmetry in the kMC calculations. We consider the importance of 〈111〉{110} and 〈111〉{112} slip systems in the homologous temperature range from 0.08Tm to 0.33Tm, where Tm =3680 K is the melting point in tungsten. (© 2015 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Slip systems interactions in α-iron determined by dislocation dynamics simulations

Cited by 126 publications

References 39 publications

Mechanical properties of nano and bulk Fe pillars using molecular dynamics and dislocation dynamics simulation

Mechanical properties of nano and bulk Fe pillars using molecular dynamics and dislocation dynamics simulation

Numerical investigations of the free surface effect in three-dimensional polycrystalline aggregates

Linking atomistic, kinetic Monte Carlo and crystal plasticity simulations of single‐crystal tungsten strength

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