About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
30 Years of Nanoindentation with the Oliver-Pharr Method and Beyond
|
Presentation Title |
Measuring Stress-strain Curves of Metals by Nanoindentation with a Frustum |
Author(s) |
Jennifer Hay, Marzyeh Moradi |
On-Site Speaker (Planned) |
Jennifer Hay |
Abstract Scope |
A method is presented for measuring the local true stress-strain curve of a metal by nanoindentation with a frustum, assuming the Young's modulus. Stress is smartly proportional to mean pressure; strain is proportional to depth. Beyond the point of full contact, these stress-strain pairs are fit to a power-law form. The yield point, which is prior to full contact, is the intersection between this fit and the linear part of the stress-strain curve (i.e. the given Young’s modulus). Thus, by the end of each indentation test, the true stress-strain curve is presented by automatically patching together these three segments into a whole: (1) From the origin to the yield point: the linear part, (2) From the yield point to the point of full contact: an extrapolation of the power-law fit, and (3) From full contact to the end of loading: measured true stress-strain. The result is quite satisfying and useful. |
Proceedings Inclusion? |
Planned: |
Keywords |
Other, Mechanical Properties, Additive Manufacturing |