About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Dynamic Behavior of Materials IX
|
Presentation Title |
G-15: In Situ Analysis of Shear Bands and Fracture in Metals |
Author(s) |
Shwetabh Yadav, Harshit Chawla, Dinakar Sagapuram |
On-Site Speaker (Planned) |
Harshit Chawla |
Abstract Scope |
Using in situ high-speed imaging, we study a failure mode in metals where localized plastic flow inside shear bands acts as a precursor to fracture. Plane-strain cutting is used as an experimental framework to impose large strain deformation under controlled rates of shear. A range of outcomes --- homogeneous flow, shear localized flow, to complete material separation --- is demonstrated using the same geometry by simply varying the shearing rate. Shear band initiation, inhomogeneous strain field development, and subsequent fracture dynamics are visualized in situ and quantitatively characterized using Particle Image Velocimetry. It is shown that a critical stress criterion governs the first transition from homogeneous flow to shear banding, whereas the localized flow to fracture transition seems to follow a strain-based rule. Implications for using cutting or “machining” as a rapid method to study the behavior of metals under extreme strains and strain rates are discussed. |
Proceedings Inclusion? |
Planned: |