Scaling laws for intrusion into granular materials and granular-fluid mixtures
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Authors
Clark, Abe
Dijksman, Joshua
Krizou, Nasser F.
Brassard, Marc
Causley, Neil
Strader, Joshua
Subjects
Advisors
Date of Issue
2021-03
Date
2021-03
Publisher
APS
Language
Abstract
This talk will summarize our recent work on moderate- and high-speed impacts into (1) dry granular media, (2) dense suspensions and (3) fluid-saturated granular beds. We show experimental, computational, and theoretical results that, for all three material types, reveal important insights regarding the underlying material response. In particular, we focus on the initial stages of impact, and we study how the peak forces and time scales depend on properties of the intruder (e.g., speed, size, mass, and shape) and of the material (e.g., grain size, grain packing fraction, grain stiffness, grain packing fraction, and fluid viscosity). For (1), we find that the peak forces are set by elastic response according to power-law scaling forms which are inconsistent with Poncelet and shock models; for (2), we find that the ubiquitous added-mass model fails to capture several crucial features of the dynamics, likely due to the neglect of large, viscous-like forces; and, for (3), we test and generally confirm Darcy-Reynolds theory, although we observe important discrepancies for high-viscosity fluids.
Type
Abstract
Description
APS March Meeting 2021, Monday–Friday, March 15–19, 2021
Series/Report No
Department
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
Funding by the Office of Naval Research, Grant No. N0001419WX01519 and by the Office of Naval Research Global Visiting Scientist Program VSP 19-7-001.
Format
1 p.
Citation
Clark, A., Dijksman, J., Krizou, N., Brassard, M., Causley, N. and Strader, J., 2021. Scaling laws for intrusion into granular materials and granular-fluid mixtures. Bulletin of the American Physical Society.
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.