The concepts of latent hardening and strain hardening in metallic single crystals

Franciosi, P.

doi:10.1016/0001-6160(85)90154-3

Cited by 239 publications

(105 citation statements)

References 12 publications

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“…Although these coplanar systems should not only self-harden but harden each other (Franciosi and Zaoui 1982), the results of Franciosi (1985) and the analysis of Bronkhorst (1991) and Havner (2005) suggest that coplanar slip systems should exhibit much less latent hardening than other systems. This work treats coplanar systems as mutually selfhardening (i.e.…”

Section: B2mentioning

confidence: 99%

“…The initial size of the single crystal specimens used in the experiments of Franciosi (1985) and Franciosi and Zaoui (1982) is not known for model validation. As the size directly affects the hardening behavior, the sizes are approximated based upon the stress-strain data.…”

Section: Materials Properties Of Coppermentioning

confidence: 99%

“…Franciosi (1985) states that single crystal copper specimens were tested; each with a different crystal direction aligned to the tensile axis. The simulated stress normal to the tensile axis and that measured experimentally for selected orientations are presented.…”

Section: Copper Single Crystal Simulationsmentioning

confidence: 99%

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Dislocation subgrain structures and modeling the plastic hardening of metallic single crystals

Hansen

Bronkhorst

Ortiz

2010

Modelling Simul. Mater. Sci. Eng.

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A single crystal plasticity theory for insertion into finite element simulation is formulated using sequential laminates to model subgrain dislocation structures. It is known that local models do not adequately account for latent hardening, as latent hardening is not only a material property, but a nonlocal property (e.g. grain size and shape). The addition of the nonlocal energy from the formation of subgrain structure dislocation walls and the boundary layer misfits provide both latent and self-hardening of a crystal slip. Latent hardening occurs as the formation of new dislocation walls limits motion of new mobile dislocations, thus hardening future slip systems. Self-hardening is accomplished by an evolution of the subgrain structure length scale. The substructure length scale is computed by minimizing the nonlocal energy. The minimization of the nonlocal energy is a competition between the dislocation wall energy and the boundary layer energies. The nonlocal terms are also directly minimized within the subgrain model as they affect deformation response. The geometrical relationship between the dislocation walls and slip planes affecting the dislocation mean free path is taken into account, giving a firstorder approximation to shape effects. A coplanar slip model is developed due to requirements while modeling the subgrain structure. This subgrain structure plasticity model is noteworthy as all material parameters are experimentally determined rather than fit. The model also has an inherit path dependence due to the formation of the subgrain structures. Validation is accomplished by comparison with single crystal tension test results.

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Section: B2mentioning

confidence: 99%

Section: Materials Properties Of Coppermentioning

confidence: 99%

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Dislocation subgrain structures and modeling the plastic hardening of metallic single crystals

Hansen

Bronkhorst

Ortiz

2010

Modelling Simul. Mater. Sci. Eng.

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“…Slip operates on octahedral slip systems (see figure 1), so that slip plane normals and directions are respectively {1 1 1} and 1 1 0 . The corresponding interaction matrix is defined by six coefficient h i [15].…”

Section: Constitutive Equationsmentioning

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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“…Celui-ci suppose que la cission résolue critique sur les systèmes de glissement dépend du glissement sur l'ensemble des systèmes, par l'intermédiaire d'une matrice d'interaction dont tous les termes sont éaux à 1 : auto-écrouissage et écrouissage latent sont exactement équivalents. Des mesures expérimentales de l'écrouissage latent ont permis d'obtenir de meilleures estimations de la matrice d'écrouissage [14][15][16][17]. Celle-ci est maintenant estimée au moyen de calculs de dynamique des dislocations [18].…”

Section: Modèles Phénoménologiques Et Modèles Basés Sur Les Densitésunclassified

Une introduction à la plasticité cristalline interactions avec l'environnement

Cailletaud

2009

PlastOx 2007 - Mécanismes Et Mécanique Des Interactions Plasticité - Environnement

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Résumé. Cette partie est une introduction aux modèles phénoménologiques de plasticité cristalline. On discute leurs propriétés, et leurs utilisations dans le cadre de modélisations de microstructures. Les versions plastiques et viscoplastiques sont citées. Les applications portent sur des monocristaux ou des polycristaux. Dans ce dernier cas, on a privilégié les modèles éléments finis, qui permettent de véritables calculs de microstructures. L'exposé se conclut par quelques exemples dans lesquels l'environnement jour un rle important.

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The concepts of latent hardening and strain hardening in metallic single crystals

Cited by 239 publications

References 12 publications

Dislocation subgrain structures and modeling the plastic hardening of metallic single crystals

Dislocation subgrain structures and modeling the plastic hardening of metallic single crystals

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

Une introduction à la plasticité cristalline interactions avec l'environnement

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