Experimental Method for Measuring Cohesion of Regolith via Electrostatic Lofting

Pett, Charles; Hartzell, Christine

Experimental Method for Measuring Cohesion of Regolith via Electrostatic Lofting

dc.contributor.advisor	Hartzell, Christine
dc.contributor.author	Pett, Charles
dc.contributor.author	Hartzell, Christine
dc.date.accessioned	2023-03-15T20:29:00Z
dc.date.available	2023-03-15T20:29:00Z
dc.date.issued	2023
dc.description	A PCO Dimax CS3 was used to take high-speed images at 945 frames per second of electrostatically lofted clumps of zirconia-silica microspheres. The images were processed and analyzed in Matlab using Matlab built-in functions. The two-dimensional centroid positions of lofted objects of interest were identified and their trajectories were tracked. The velocity and accelerations of tracked objects were then numerically calculated in order to solve for the cohesion, and compared to other independent methods.	en_US
dc.description.abstract	The hypothesized electrostatic lofting of individual regolith grains on the Moon and asteroids has been investigated extensively in laboratory studies. Cohesion may dominate how regolith behaves on these small, airless bodies, yet the magnitude of this force remains uncertain. We induce the electrostatic detachment of dust as a mechanism to break cohesive bonds between individual zirconia-silica microspheres in order to measure the interparticle cohesive force between them. A high-speed camera imaged centroid positions of the lofted microspheres over time. Using the centroids from the initial detachment, we numerically calculated initial accelerations to solve for the cohesion that had been restraining the microspheres. Unexpectedly, the electrostatic lofting of clumps of particles was observed and experimental results showed that clumps were a non-negligible portion of the lofted object population.
dc.description.sponsorship	NASA PICASSO Grant 80NSSC18K0936	en_US
dc.identifier	https://doi.org/10.13016/5mfo-ynvz
dc.identifier.uri	http://hdl.handle.net/1903/29745
dc.language.iso	en_US	en_US
dc.relation.isAvailableAt	A. James Clark School of Engineering	en_us
dc.relation.isAvailableAt	Aerospace Engineering	en_us
dc.relation.isAvailableAt	Digital Repository at the University of Maryland	en_us
dc.relation.isAvailableAt	University of Maryland (College Park, MD)	en_us
dc.rights	CC0 1.0 Universal	*
dc.rights.uri	http://creativecommons.org/publicdomain/zero/1.0/	*
dc.subject	interparticle cohesion	en_US
dc.subject	clump lofting	en_US
dc.subject	laboratory studies	en_US
dc.title	Experimental Method for Measuring Cohesion of Regolith via Electrostatic Lofting	en_US
dc.type	Dataset	en_US