| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanical Behavior Related to Interface Physics IV
|
| Presentation Title |
An Improved Technique for Accurate Mechanical Characterization of Free-Standing Films and Its Applications |
| Author(s) |
Gang Feng, Henna Khosla, 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 the elastic properties (modulus and prestrain), the plastic properties (strength), as well as interfacial adhesion/interaction. 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 |