Dual-axis video observations of ice crushing utilizing high-speed video for one perspective
Rectangular thick sections (1 cm thickness) of lab-grown monocrystalline ice have been confined between two thick Plexiglas plates and crushed at -10º C from one edge face at a rate of 1 cm/s using a transparent Plexiglas platen (1 cm thickness) inserted between the plates. The transparent plates an...
| Main Authors: | , |
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| Format: | Article in Journal/Newspaper |
| Language: | unknown |
| Published: |
2005
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| Online Access: | https://nrc-publications.canada.ca/eng/view/ft/?id=ca8327a6-70ab-4035-9d59-04b69ca42f20 https://nrc-publications.canada.ca/eng/view/object/?id=ca8327a6-70ab-4035-9d59-04b69ca42f20 https://nrc-publications.canada.ca/fra/voir/objet/?id=ca8327a6-70ab-4035-9d59-04b69ca42f20 |
| Summary: | Rectangular thick sections (1 cm thickness) of lab-grown monocrystalline ice have been confined between two thick Plexiglas plates and crushed at -10º C from one edge face at a rate of 1 cm/s using a transparent Plexiglas platen (1 cm thickness) inserted between the plates. The transparent plates and platen permitted side viewing of the ice behavior during crushing using high-speed video and also a top view of the ice/platen contact zone through the crushing platen using regular video. Zones of intact ice at the ice/platen interface were evident in the visual records and these were shaped by cracks and spalls. The production and flow of liquid in a thin layer at the intact ice/platen interface was also evident. A novel method was used to obtain pressure measurements at the ice/platen interface. Pressure values for the intact ice contact zones were high (at least 20 MPa) and for the crushed ice the pressure varied from low (~1 MPa) to high values (~20 MPa) depending on its thickness over intact ice. Also, wetting from liquid produced at the intact ice/ platen interface probably softened and reduced the pressure in pulverized ice. Features of the load and pressure data are discussed in the context of the visual observations. Peer reviewed: Yes NRC publication: Yes |
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