About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
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30 Years of Nanoindentation with the Oliver-Pharr Method and Beyond
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Presentation Title |
10% Rule of Thumb for Indentation Mechanical Behavior: Fact or Fiction |
Author(s) |
Megan J. Cordill |
On-Site Speaker (Planned) |
Megan J. Cordill |
Abstract Scope |
One of the most common methods to measure the elastic modulus and hardness of thin films is to use nanoindentation and the well-known “10% rule of thumb”. The 10% rule of thumb has evolved to the understanding that elastic modulus and hardness can be measured at 10% of the film thickness with no or little influence from the substrate, even though only hardness was stated in the original Bueckle paper. While this guideline may hold true for some film-substrate systems and film thicknesses (greater than 1000 nm), it cannot and should not, be applied universally. Using several examples of hard-on-soft and soft-on-hard material systems of various thicknesses and finite element simulations, it will be demonstrated that the 10% rule of thumb, an outdated and misused guideline, should not be applied to evaluate the elastic modulus of thin films because it is a long-range property, substantially influenced by the substrate. |
Proceedings Inclusion? |
Planned: |
Keywords |
Mechanical Properties, Thin Films and Interfaces, Other |