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Direct measurement of local constitutive relations, at the micrometre scale, in bulk metallic alloys
Author(s) -
Plancher E.,
Favier V.,
Maurice C.,
Bosso E.,
Rupin N.,
Stodolna J.,
Loisnard D.,
Marijon J.-B.,
Petit J.,
Micha J.-S.,
Robach O.,
Castelnau O.
Publication year - 2017
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s1600576717006185
Subject(s) - materials science , constitutive equation , microstructure , plasticity , digital image correlation , crystal (programming language) , crystal plasticity , measure (data warehouse) , stress (linguistics) , single crystal , characterization (materials science) , mechanics , composite material , crystallography , thermodynamics , nanotechnology , finite element method , physics , computer science , linguistics , philosophy , database , programming language , chemistry
Multiscale models involving crystal plasticity are essential to predict the elastoplastic behavior of structural materials with respect to their microstructure. However, those models are often limited by a poor knowledge of the local constitutive behavior. This article reports a method to measure the mechanical behavior directly, at the micrometre scale, in bulk crystalline materials. Local strain and stress states were evaluated at the surface of a bent stainless steel crystal by combining total strain measurements – performed with the digital image correlation technique on optical images – with elastic strain measurements obtained by Laue microdiffraction. A local constitutive relation was measured, in an efficient nondestructive way, without the need for full‐field simulations. The method was validated by a comparison between the measured local behavior and the macroscopic behavior of the single crystal.