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A simple device for in-situ direct shear and sinkage tests

Jerves, A. and Ling, H. and Gabaldon, J. and Usoltceva, M. and Cousté, C. and Agarwal, A. and Hurley, R. and Andrade, J. E. (2013) A simple device for in-situ direct shear and sinkage tests. . (Unpublished)

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This work introduces a simple device designed to perform in-situ direct shear and sinkage tests on granular materials as sand, clays, or regolith. It consists of a box nested within a larger box. Both have open bottoms, allowing them to be lowered into the material. Afterwards, two rotating plates on opposite sides of the outer box will rotate outwards in order to clear regolith on either side, providing room for the inner box to move relative to the plates and perform a shear test without the resistance of the surrounding soil. From this test, Coulomb parameters, including cohesion and internal friction angle, as well as, Bekker parameters can be inferred. This device has been designed for a laboratory setting, but with few modifications, could be put on the underside of a rover for use in a remote location. The goal behind this work is to ultimately create a compact, but accurate measuring tool to put onto a rover or any kind of exploratory vehicle to test for regolith properties of celestial bodies.

Item Type:Report or Paper (Technical Report)
Additional Information:This work was possible thanks to the financial support of the Keck Institute for Space Studies (KISS), and the important contributions of Dr. Brian Trease, Dr. Matt Golombek, and Dr. Julie Castillo from the NASA's Jet Propulsion Laboratory at the California Institute of Technology (JPL), who collaborated giving technical advise and providing regolith simulant (MMS<2mm) for the experimental phase of the project.
Group:Keck Institute for Space Studies
Funding AgencyGrant Number
Keck Institute for Space Studies (KISS)UNSPECIFIED
Record Number:CaltechAUTHORS:20190213-135449470
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:92891
Deposited By: Iryna Chatila
Deposited On:13 Feb 2019 22:06
Last Modified:03 Oct 2019 20:49

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