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The local plastic strain evolution plays an important role in the ductile fracture of structural metallic components such as steel. For instance, the failure of dual-phase steel1,2) and austenitic transformation-induced-plasticity steel3,4) are predominantly controlled by the deformation-induced micro-damage evolution associated with the plastic straining at the damage tip. Specifically, the final failure is caused by damage such as void and crack coalescence and growth. In particular, the heterogeneous plastic deformation occurs at the crack tip, owing to the stress concentration. Hence, the microstructural plastic strain and its gradient have been recognized as key factors in understanding the underlying mechanism of the ductile fracture and ductile crack growth phenomena. The plastic strain evolution depending on the crack opening/propagation is different between the surface and the interior of the material, owing to the difference of the stress field. To discuss the crack propagation, it is necessary to measure the plastic strain distribution of not only the surface, but also of the material’s interior. In the numerical approach, the stress-strain relationship is analyzed using the finite element method (FEM). Moreover, the crystal plasticity FEM, which considers the effects of the crystal structure and interfacial structure, has also been developed.5–7) In the experimental approach, the digital image correlation (DIC) method using artificial fine particles or a microstructural pattern as a random pattern EBSDand ECCI-based Assessments of Inhomogeneous Plastic Strain Evolution Coupled with Digital Image Correlation

EBSD and ECCI Based Assessments of Inhomogeneous Plastic Strain Evolution Coupled with Digital Image Correlation