| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
100 Years and Still Cracking: A Griffith Fracture Symposium
|
| Presentation Title |
Modeling Insights into Micro Single-Edge Bend Fracture Toughness Testing of Multilayered Metal-ceramic Cu/TiN and Al/TiN Nanocomposite Thin Films |
| Author(s) |
Daniel Savage, Shubhrodev Bhowmik, Cayla Harvey, Amit Misra, Nathan Mara, Jeffrey Wheeler, Johann Michler, Siddhartha Pathak, Marko Knezevic |
| On-Site Speaker (Planned) |
Daniel Savage |
| Abstract Scope |
Reliable extraction of fracture toughness in thin films of multilayered metal-ceramic Cu-TiN and Al-TiN nanocomposite systems is an outstanding problem and the micro single-edge bend (MSEB) test is a promising solution. In this work we systematically identify the effects of geometry, indenter stress field, and layer shielding effects on the determination of mode one fracture toughness using in-situ nanoindentation of MSEB specimens. Linear elastic finite element analysis is used to obtain local fields at experimental crack tip locations. The J and interface integral are used to isolate the effect of indenter stress field and give insight into the effectiveness of the material systems at preventing crack propagation. We find the leg geometry is significant in MSEB and show that changes in bending moment are driving increasing fracture toughness with decreasing crack ligament length. The design of geometry against bending moment variation is fundamental for MSEB standardization at small length scales. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Thin Films and Interfaces, Composites |