|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||Characterization of Minerals, Metals and Materials
||Orientation-induced Variability Range in Indentation-measured Elastic Modulus of Molecular Crystals
||Alexandra Burch, John Yeager, David Bahr
|On-Site Speaker (Planned)
Single crystals of molecular crystalline materials such as pharmaceuticals and explosives are often highly anisotropic, lending to high variability in the outcomes of oriented mechanical testing such as nanoindentation with pyramidal probes. This variability can require a large number of experiments to be performed in order to achieve the full range of possible results, and can also subject results on extreme ends of this range to skepticism. In order to achieve an appropriate expectation for the range possible in these materials, nanoindentation with pyramidal probes is performed on the explosives PETN and HMX as well as the pharmaceutical idoxuridine and food product erythritol. These materials represent a variety of crystal structures, and some such as HMX and idoxuridine have been of interest recently as potential mechanical mocks. During indentation, in-plane orientation is varied by rotational angles and elastic modulus is compared as a function of relative angle.