| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advanced Characterization Techniques for Quantifying and Modeling Deformation
|
| Presentation Title |
Size Effects and Failure Regimes in Notched Micro-cantilever Beam Fracture |
| Author(s) |
Devashish Rajpoot, Parag Tandaiya, R Lakshmi Narayan, Ramamurty Upadrasta |
| On-Site Speaker (Planned) |
Ramamurty Upadrasta |
| Abstract Scope |
Fracture tests using notched micro-cantilever (MC) specimens are increasingly being used to measure the fracture toughness of materials at the micro-scale. Finite element analyses (FEAs) of loading of self-similar micro- and bulk cantilever beam fracture specimens using isotropic, elastoplastic constitutive models, are conducted to critically examine the validity of the toughness data obtained using MC specimens. A transition in the failure regimes from crack propagation to plastic collapse of the uncracked notch ligament is identified. While the crack propagation regime allows for the estimation of valid fracture toughness of the probed material, the plastic collapse regime does not. The effects of specimen aspect ratios, material hardening, and yield criteria on the master curves and transition point are examined and a method to interpret the failure regimes, assess the validity and size effects in micro-cantilever fracture tests on bulk metallic glasses, nano-crystalline materials and ultra-fine grained materials is proposed. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Modeling and Simulation, Other |