An Examination of a Subsurface Impact on a Floating Ice Sheet.
An examination is made of the influence that various parameters impose upon the structural dynamics of a floating ice sheet due to the initial impact of a large mass. The Ritz method is employed to formulate a simple shape function to approximate a solution of the plate equation, subsequently used t...
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ftdtic:ADA338293 2023-05-15T16:37:24+02:00 An Examination of a Subsurface Impact on a Floating Ice Sheet. Conley, Judy A. NAVAL SURFACE WARFARE CENTER CARDEROCK DIV BETHESDA MD 1997-11 text/html http://www.dtic.mil/docs/citations/ADA338293 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA338293 en eng http://www.dtic.mil/docs/citations/ADA338293 APPROVED FOR PUBLIC RELEASE DTIC AND NTIS Snow Ice and Permafrost *ICE *FLOATING BODIES FUNCTIONS VOLUME GLOBAL INERTIA IMPACT DYNAMICS PARAMETERS STRUCTURAL PROPERTIES MASS DISPLACEMENT FORMULATIONS SHAPE POTENTIAL ENERGY HEMISPHERES SUBSURFACE COLLISIONS CRUSHING Text 1997 ftdtic 2016-02-19T21:52:00Z An examination is made of the influence that various parameters impose upon the structural dynamics of a floating ice sheet due to the initial impact of a large mass. The Ritz method is employed to formulate a simple shape function to approximate a solution of the plate equation, subsequently used to represent the static displacement, obtain bending stiffness, and appropriate the fundamental frequency by the principle of minimum potential energy. Fluid inertia is incorporated by assuming the mass of a hemispherical volume of fluid, associated with the effective radius of the displaced shape, distributed as a function of the displaced shape of the plate. A dynamic formulation of a two degree-of-freedom system is made and shown equivalent to two separate one degree-of-freedom systems because of the huge disparity between the two masses due to the fluid inertia influence. Each separate system provides solutions for different issues of the study. An inelastic collision represents the global impact loading influencing the general bending of the ice plate. The local crushing deformation on the underside of the ice plate, found using both a Hertz contact solution and linear approximation, depicts the initial impact force. The influence of parameters for each system is quantified. Text Ice Ice Sheet permafrost Defense Technical Information Center: DTIC Technical Reports database |
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Open Polar |
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Defense Technical Information Center: DTIC Technical Reports database |
op_collection_id |
ftdtic |
language |
English |
topic |
Snow Ice and Permafrost *ICE *FLOATING BODIES FUNCTIONS VOLUME GLOBAL INERTIA IMPACT DYNAMICS PARAMETERS STRUCTURAL PROPERTIES MASS DISPLACEMENT FORMULATIONS SHAPE POTENTIAL ENERGY HEMISPHERES SUBSURFACE COLLISIONS CRUSHING |
spellingShingle |
Snow Ice and Permafrost *ICE *FLOATING BODIES FUNCTIONS VOLUME GLOBAL INERTIA IMPACT DYNAMICS PARAMETERS STRUCTURAL PROPERTIES MASS DISPLACEMENT FORMULATIONS SHAPE POTENTIAL ENERGY HEMISPHERES SUBSURFACE COLLISIONS CRUSHING Conley, Judy A. An Examination of a Subsurface Impact on a Floating Ice Sheet. |
topic_facet |
Snow Ice and Permafrost *ICE *FLOATING BODIES FUNCTIONS VOLUME GLOBAL INERTIA IMPACT DYNAMICS PARAMETERS STRUCTURAL PROPERTIES MASS DISPLACEMENT FORMULATIONS SHAPE POTENTIAL ENERGY HEMISPHERES SUBSURFACE COLLISIONS CRUSHING |
description |
An examination is made of the influence that various parameters impose upon the structural dynamics of a floating ice sheet due to the initial impact of a large mass. The Ritz method is employed to formulate a simple shape function to approximate a solution of the plate equation, subsequently used to represent the static displacement, obtain bending stiffness, and appropriate the fundamental frequency by the principle of minimum potential energy. Fluid inertia is incorporated by assuming the mass of a hemispherical volume of fluid, associated with the effective radius of the displaced shape, distributed as a function of the displaced shape of the plate. A dynamic formulation of a two degree-of-freedom system is made and shown equivalent to two separate one degree-of-freedom systems because of the huge disparity between the two masses due to the fluid inertia influence. Each separate system provides solutions for different issues of the study. An inelastic collision represents the global impact loading influencing the general bending of the ice plate. The local crushing deformation on the underside of the ice plate, found using both a Hertz contact solution and linear approximation, depicts the initial impact force. The influence of parameters for each system is quantified. |
author2 |
NAVAL SURFACE WARFARE CENTER CARDEROCK DIV BETHESDA MD |
format |
Text |
author |
Conley, Judy A. |
author_facet |
Conley, Judy A. |
author_sort |
Conley, Judy A. |
title |
An Examination of a Subsurface Impact on a Floating Ice Sheet. |
title_short |
An Examination of a Subsurface Impact on a Floating Ice Sheet. |
title_full |
An Examination of a Subsurface Impact on a Floating Ice Sheet. |
title_fullStr |
An Examination of a Subsurface Impact on a Floating Ice Sheet. |
title_full_unstemmed |
An Examination of a Subsurface Impact on a Floating Ice Sheet. |
title_sort |
examination of a subsurface impact on a floating ice sheet. |
publishDate |
1997 |
url |
http://www.dtic.mil/docs/citations/ADA338293 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA338293 |
genre |
Ice Ice Sheet permafrost |
genre_facet |
Ice Ice Sheet permafrost |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/ADA338293 |
op_rights |
APPROVED FOR PUBLIC RELEASE |
_version_ |
1766027693191593984 |