Geo-Congress 2020
Impact of Shell Opening of a Model Razor Clam on the Evolution of Force Chains in Granular Media
Publication: Geo-Congress 2020: Biogeotechnics (GSP 320)
ABSTRACT
The razor clams alternately inflate the shelled body and the muscular foot when burrowing down to the ground. It is found from previous numerical simulations that inflation of the shelled body not only forms a firm anchor for the foot penetration, but also reduces penetration resistance; on the other hand, further foot penetration relaxes the shell anchorage, which may compromise the burrowing effectiveness and efficiency. This study utilizes a photoelasticity-based technology, augmented with image processing, to validate the numerical findings. A simplified penetrator model composed of an expandable rectangular shell and a protrusible triangular foot is designed and incorporated into a transparent cell containing more than four thousand photoelastic disks. Sequential images are then taken during the model penetration, which include an initial foot penetration, followed by shell expansion, and then another foot penetration. An image processing algorithm is developed to detect the evolution of grain contact forces (orientation and magnitude of contact forces) during the shell expansion and foot penetration of the model. Results from this study confirm the existence of the mutual influence between shell expansion pressure and foot penetration resistance: that is, increasing one causes reduction of the other and vice versa.
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Information & Authors
Information
Published In
Geo-Congress 2020: Biogeotechnics (GSP 320)
Pages: 272 - 281
Editors: Edward Kavazanjian Jr., Ph.D., Arizona State University, James P. Hambleton, Ph.D., Northwestern University, Roman Makhnenko, Ph.D., University of Illinois at Urbana-Champaign, and Aaron S. Budge, Ph.D., Minnesota State University, Mankato
ISBN (Online): 978-0-7844-8283-4
Copyright
© 2020 American Society of Civil Engineers.
History
Published online: Feb 21, 2020
Published in print: Feb 21, 2020
ASCE Technical Topics:
- Analysis (by type)
- Anchors
- Computer vision and image processing
- Contact mechanics
- Continuum mechanics
- Deformation (mechanics)
- Design (by type)
- Engineering fundamentals
- Engineering materials (by type)
- Engineering mechanics
- Equipment and machinery
- Granular materials
- Load and resistance factor design
- Load factors
- Materials engineering
- Methodology (by type)
- Models (by type)
- Numerical analysis
- Numerical models
- Solid mechanics
- Stress (by type)
- Stress distribution
- Structural analysis
- Structural design
- Structural engineering
- Structural mechanics
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