Coring Bit with Enhanced Structural Parameters for Improved Lunar Soil Sampling and Reduced Mechanical Disturbance
Publication: Journal of Aerospace Engineering
Volume 29, Issue 4
Abstract
A new coring bit with a barrier ring was developed to address the disturbance problem associated with the common method of lunar soil sampling. This new coring bit is presented in this paper along with an analysis of the physical characteristics of regolith and coring bits. The structural parameters of the barrier ring, which disturbs the original state of the soil, are also analyzed. A user-defined material, based on the user-defined material mechanical behavior (UMAT) subroutine in the ABAQUS finite-element software, was used to simulate the contact area between the lunar soil and the barrier. The simulation results showed that the structure of the barrier ring has a significant effect on the stress and displacement produced in the lunar soil below the coring bit, but has little effect on the soil inside the ring. The test results showed that the coring bit with the barrier ring achieves a higher coring rate and causes less disturbance than a common bit.
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Acknowledgments
The authors thank the China Academy of Space Technology (CAST) for its help during the investigation. This study was supported by the National Defense Science and Technology Major Project (Grants TY3Q20110001 and TY3Q20110005) and by the Programme of Introducing Talents of Discipline to Universities (B07018).
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© 2016 American Society of Civil Engineers.
History
Received: Jun 4, 2014
Accepted: Nov 18, 2015
Published online: Feb 8, 2016
Published in print: Jul 1, 2016
Discussion open until: Jul 8, 2016
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