About this Abstract |
Meeting |
6th International Congress on 3D Materials Science (3DMS 2022)
|
Symposium
|
6th International Congress on 3D Materials Science (3DMS 2022)
|
Presentation Title |
Ductile Damage UnderSshear Loading: Mechanisms Analysis Through In-situ Laminography Experiments for Dual-phase Steel and Aluminum Alloys |
Author(s) |
Dirk Mohr, Thomas Tancogne-Dejean |
On-Site Speaker (Planned) |
Thomas Tancogne-Dejean |
Abstract Scope |
The nucleation, evolution and coalescence of voids is the well-established mechanism leading to ductile fracture under tension-dominated loading conditions. From a theoretical point of view, the same mechanism also applies to shear-dominated loading conditions. Using in-situ X-ray synchrotron laminography experiments, the failure mechanisms of two modern engineering materials (AA2024-T3 and FB600 steel) are investigated under low stress triaxialities. The mesostructural evolution is reconstructed through multiple loading steps, using 2D Digital Image Correlation of projected volumetric data. For both materials, it is found that preexisting second-phase particles acts as nucleation site through either cracking or debonding. The nucleated voids growth to micro-crack like feature leading to final failure. Fracture mechanisms are proposed based on these observations and assessed with representative volume element simulations, pointing towards the formation of a shear localization band during the final loading step. |
Proceedings Inclusion? |
Definite: Other |