| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Structure-Property Relationships in Molecular Crystal Deformation
|
| Presentation Title |
Impact of Nanoindentation Tip Geometry on Orientation-Dependent Nanomechanical Behavior of PETN |
| Author(s) |
Morgan Chamberlain, Alexandra Burch, David Bahr |
| On-Site Speaker (Planned) |
Morgan Chamberlain |
| Abstract Scope |
In-plane rotational orientation of non-axisymmetric indenters impacts the quantification of properties measured by indentation when testing anisotropic materials. The orientation-dependent slip behavior of pentaerythritol tetranitrate (PETN) was investigated via nanoindentation along with yield behavior, hardness, and modulus. Using three indenter tip geometries and radii: a Berkovich, a Knoop, and a Conical tip, a cumulative fraction distribution of maximum shear stress showed that the Berkovich had the smallest distribution of yield events, and the conical indents had the largest. This variation in distribution was reflected in the activation volumes; the Berkovich activation volume was 4.6% higher than the Knoop, and 25.9% higher than the conical activation volume. The Knoop had the highest variation in both the hardness and modulus measurements as a function of in-plane rotational angle. Surprisingly, the conical indenter exhibited the lowest cracking threshold, at 13mN fracture was evident with the Conical but not in the others. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Mechanical Properties, Other |