Anisotropic polycrystal plasticity due to microstructural heterogeneity: A multi-scale experimental and numerical study on additively manufactured metallic materials

2020 ◽  
Vol 185 ◽  
pp. 340-369 ◽  
Author(s):  
S. Amir H. Motaman ◽  
Franz Roters ◽  
Christian Haase
Keyword(s):  
Numerical Study ◽  
Metallic Materials ◽  
Multi Scale ◽  
Microstructural Heterogeneity ◽  
Polycrystal Plasticity

Processing Dense Hetero-Nanostructured Metallic Materials for Improved Strength/Ductility Balance through High Strain Deformation and Electrical Current Assisted Sintering (ECAS)

2009 ◽  
Vol 633-634 ◽  
pp. 559-567 ◽  
Author(s):  
Thierry Grosdidier ◽  
Núria Llorca-Isern
Keyword(s):  
High Strain ◽  
Milled Powder ◽  
Electrical Current ◽  
Processing Parameters ◽  
Metallic Materials ◽  
Bulk Materials ◽  
Multi Scale ◽  
Field Assisted Sintering ◽  
Y2o3 Addition ◽  
Powder Metallurgy Route

This paper has examined some recent findings concerning the processing of fully dense hetero-nanostructured materials (i.e. consisting of nano, ultrafine and micrometric grains) which can be produced by using the interplay between heavy deformation and recrystallization. By plastic deformation of bulk materials, an improved strength/ductility balance can be obtained directly by imparting high strain deformation (by ECAE) until the occurrence of recrystallization. Using a powder metallurgy route, the strong potential of electric field assisted sintering (ECAS) for producing multi-scale microstructures when a milled powder is used is also demonstrated. In this case, in addition to modify the classic processing parameters (time/temperature of ECAS), altering the nature of the milled powder - by Y2O3 addition during the milling stage - is also a good way to delay the onset of recrystallization and, thereby, increase the fraction of ultrafine grains.

scholarly journals MULTI-SCALE INFRA-GRAVITY WAVE DYNAMICS - THE FRENCH BASQUE COAST

2020 ◽  
pp. 46
Author(s):  
Volker Roeber ◽  
J. Dylan Nestler ◽  
Jonas Pinault ◽  
Assaf Azouri ◽  
Florian Bellafont
Keyword(s):  
Water Level ◽  
Gravity Wave ◽  
Numerical Study ◽  
Numerical Models ◽  
Wave Direction ◽  
Wave Dynamics ◽  
Multi Scale ◽  
Offshore Wave ◽  
A Site ◽  
Basque Coast

Phase-resolving numerical models are a powerful tool to identify and analyze dominant wave processes along a site of interest. We have carried out a numerical study related to infra-gravity wave dynamics along the French Basque coast. The computed scenarios are representative for the swell conditions at the site of interest and include variations in offshore wave height, direction, and water level. Several statistical methods were employed that illustrate that the irregular bathymetry is a key component for the strong variations in sea-swell and IG-wave energy. The water level is demonstrated to substantially affect the IG-wave behavior, more than the wave direction. Swash oscillations in the IG-frequency band are greater than or equal to sea-swell swash oscillations at nearly all locations along the studied shoreline.Recorded Presentation from the vICCE (YouTube Link): https://youtu.be/ELZwJCokkX0

Multi-scale modeling of polycrystal plasticity: a workshop report

1998 ◽  
Vol 251 (1-2) ◽  
pp. 1-22 ◽  
Author(s):  
Geoffrey H. Campbell ◽  
Stephen M. Foiles ◽  
Hanchen Huang ◽  
Darcy A. Hughes ◽  
Wayne E. King ◽  
...  
Keyword(s):  
Workshop Report ◽  
Multi Scale ◽  
Scale Modeling ◽  
Polycrystal Plasticity ◽  
Multi Scale Modeling

Numerical Study of the Influence of Dislocation Microstructure on Metallic Materials Mechanical Behaviour

2006 ◽  
Vol 524-525 ◽  
pp. 511-516
Author(s):  
D. Gloaguen ◽  
Jamal Fajoui ◽  
Bruno Courant ◽  
Ronald Guillén
Keyword(s):  
Plastic Deformation ◽  
Mechanical Behaviour ◽  
Strain Path ◽  
Numerical Study ◽  
Mechanical Tests ◽  
Polycrystalline Materials ◽  
Metallic Materials ◽  
Mechanical Modelling ◽  
Elasto Plasticity ◽  
Strain Path Changes

A two-level homogenisation approach is applied to the micro-mechanical modelling of the elasto-plasticity of polycrystalline materials during various strain-path changes. The model is tested by simulating the development of intragranular strains during different complex loads. Mechanical tests measurements are used as a reference in order to validate the model. The anisotropy of plastic deformation in relation to the evolution of the dislocation structure is analysed. The results demonstrate the relevance of this approach for FCC polycrystals.

Sign in / Sign up

Export Citation Format

Share Document