About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
30 Years of Nanoindentation with the Oliver-Pharr Method and Beyond
|
Presentation Title |
An Improved Technique for Accurate Mechanical Characterization of Free-standing Films and Its Applications |
Author(s) |
Gang Feng, Lu An, Dong Zhou, Bo Li |
On-Site Speaker (Planned) |
Gang Feng |
Abstract Scope |
Freestanding films (FFs) enable promising applications. To design reliable FF-based devices, it is essential to know the FFs’ mechanical properties. The most common testing method is nanoindentation of a suspended FF. However, rigorous mechanics models are required to analyze the mechanical measurements. In this study, we demonstrate significant issues associated with existing models. A new improved analytical model is developed, matching nicely with finite element analysis. More importantly, all previous studies are based on the load-displacement relation which is assumed to be elastic, and this assumption has commonly been overlooked and induced serious issues. In this study, a new methodology is developed, which can accurately determine not only the elastic properties (modulus and prestrain) but also the plastic properties (strength). We believe that this new analytical model and new methodology will enable much more accurate mechanical characterization of any FFs, particularly 2D materials. |
Proceedings Inclusion? |
Planned: |
Keywords |
Thin Films and Interfaces, Mechanical Properties, Characterization |