| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
100 Years and Still Cracking: A Griffith Fracture Symposium
|
| Presentation Title |
On the Transition from Shear Banding to Fracture in Metals: In Situ Analysis of Plastic Flow and Deformation Fields |
| Author(s) |
Shwetabh Yadav, Harshit Chawla, Dinakar Sagapuram |
| On-Site Speaker (Planned) |
Dinakar Sagapuram |
| Abstract Scope |
Using direct high-speed imaging, we study a mode of failure in high-rate deformation of metals where localized plastic flow inside shear bands acts as a precursor to fracture. A 2D cutting configuration is used to impose large strain deformation under controlled rates of shear. A range of outcomes in the material behavior — homogeneous flow, highly localized shear band flow, partial fracture along the band, to complete material separation — is demonstrated using the same geometry by simply varying the shearing rate. Shear band formation, inhomogeneous strain field development, and subsequent dynamics of material separation and fracture are quantitatively characterized using particle image velocimetry. It is shown that a critical stress criterion governs the first transition from homogeneous flow to shear banding, while the evidence suggests localized flow to fracture transition follows a strain-based rule. Implications of plastic instabilities and flow transitions for material removal processes will be also discussed. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Other, |