188. determination of geometrically necessary dislocations in large shear strain localization in metals
Research Institute Affiliation: Graduate Program in Materials Science and Engineering
Faculty Advisor(s): Kenneth S. Vecchio
Name: Chaoyi Zhu
Grad Year: 2021
Shear localization and shear banding propensity has been extensively studied for more than half a century. However, the study of shear localization still has significant limitations in terms of quantitative assessments of shear localized microstructure evolution. With the recent introduction of the compact forced simple shear (CFSS) sample, detailed quantitative examination of the influence of microstructural anisotropy and crystallographic anisotropy on the evolution of shear localization and shear banding phenomena is now possible. Combined with EBSD-based geometrically-necessary dislocation density calculations from lattice rotations, we are able to show how GND evolution near shear bands can provide quantitative information about how damage in 7039-aluminum alloy is determined by the anisotropy in grain morphology in the shear direction, and how initial crystallographic anisotropy in texture relative to the shear orientation in high-purity titanium affects work-hardening, ductility and energy absorption ability of the material.
Industry Application Area(s)
Aerospace, Defense, Security | Civil/Structural Engineering | Materials