About this Abstract |
Meeting |
TMS Specialty Congress 2025
|
Symposium
|
The 7th International Congress on 3D Materials Science (3DMS 2025)
|
Presentation Title |
Quantifying Ductile Fracture Mechanisms in AA2198-T851 Through Void Tracking of In-Situ Laminography Experiments |
Author(s) |
Thomas Tancogne-Dejean, Christian Roth, Thilo Morgeneyer, Dirk Mohr |
On-Site Speaker (Planned) |
Thomas Tancogne-Dejean |
Abstract Scope |
Synchrotron laminography has proven to be an effective method for examining the nucleation, growth, and coalescence of voids at the material level. Here, monotonic experiments are conducted on AA2198-T8 using a laminography stage on a synchrotron X-ray line. The specimens tested include a “smiley” shear geometry, tensile specimens with notch and circular cut-outs, as well as a compact tension geometry, effectively spanning stress states from low (η=0) to high (η>>1) triaxialities. Multiple scans of the entire gage section with resolution of approximately 1µm³ allow capturing the meso-structural evolution within the material in 3D up to fracture. Additional macroscopic experiments are used to identify parameters for a non-quadratic plasticity model with isotropic hardening. A novel two-step void tracking algorithm, leveraging finite element displacement fields and heuristics, is introduced to provide deeper insight into void nucleation, growth, and coalescence. It allows for the first time a quantitative analysis of respective void populations. |
Proceedings Inclusion? |
Undecided |