Periodic Reporting for period 2 - QUANTIFY (Unraveling the role of anisotropy in material failure)
Berichtszeitraum: 2020-01-01 bis 2023-06-30
Work Package 1: The effect of microstructure optimization induced anisotropy on the dynamic mechanical failure of lightweight alloys. The goal is to uncover, understand and model the role of material anisotropy on the dynamic mechanical failure of lightweight metallic structures fabricated with microstructure optimization techniques. The goal of this WP was to uncover, understand and model the role of material anisotropy on the dynamic mechanical failure of lightweight metallic structures fabricated with microstructure optimization techniques. We have used an innovative multiscale and multiphysical approach, which specifically considers micromechanical constitutive models, to address necking and shear band failure of oligocrystalline and polycrystalline lightweight metals subjected to dynamic loading. For that purpose, we have developed analytical and numerical models to describe the role of anisotropy in the problems at hand. As a methodological standpoint, we have performed experiments to validate and assess the predictive capacity of such models.
Work Package 2: The effect of additive manufacturing induced anisotropy on the dynamic mechanical failure of lightweight alloys. The goal of this WP was to uncover, understand and model the role of porous microstructure on the dynamic failure of anisotropic lightweight alloys fabricated with 3D printing. We have used homogenization techniques to account for the characteristic porosity of 3D printed materials, and we have described using both macromechanical and microstructurally-informed constitutive models, the dynamic failure of lightweight porous metals under shear dominated and pressure dominated loading conditions. Pores resulting from the 3D-printing process act as defects and preferential sites for crack nucleation and propagation, so that it is essential to understand the effect of voids size, voids shape and void volume fraction on dynamic localization and fracture of parts and components used in the transportation and security industrial sectors. For that purpose, we have developed analytical and numerical models to describe the role of anisotropy in the problems at hand. As a methodological standpoint, we have performed experiments to validate and assess the predictive capacity of such models.
In addition to the secondments, we have developed a series of networking activities which include the organization of three international conferences sponsored by international scientific societies EUROMECH, IUTAM and SEMTA-MECAMAT, several thematic sessions in international congresses and one technical training course at the International Center of Mechanical Sciences. We have also participated in an Industrial Workshop to identify practical problems faced by aerospace and civilian-security industries which can be tackled with the scientific developments of QUANTIFY.