Model Testing of Structures in Ice: Consideration of Scale Effects
The question posed of confidence and scale factor effects of ice model tests is complex. Modelling of the structure is not always straightforward, but in most cases a good representation of the prototype structure can be built. The properties of refrigerated model ice all scale very well, especially...
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ftdtic:ADP003819 2023-05-15T16:41:21+02:00 Model Testing of Structures in Ice: Consideration of Scale Effects Timco,G. W. NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) 1983-08 text/html http://www.dtic.mil/docs/citations/ADP003819 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADP003819 en eng http://www.dtic.mil/docs/citations/ADP003819 APPROVED FOR PUBLIC RELEASE DTIC AND NTIS *ICE *MODEL TESTS *SCALING FACTOR STRUCTURES INTERACTIONS EXTRAPOLATION CONFIDENCE LEVEL MATHEMATICAL PREDICTION CRUSHING FLEXURAL STRENGTH STRESS ANALYSIS FAILURE(MECHANICS) LOADS(FORCES) SHEETS Component Reports Text 1983 ftdtic 2016-02-21T19:55:56Z The question posed of confidence and scale factor effects of ice model tests is complex. Modelling of the structure is not always straightforward, but in most cases a good representation of the prototype structure can be built. The properties of refrigerated model ice all scale very well, especially if care is taken in choosing the scale factor based on the crushing strength of the ice. Results of structure testing in model ice would seem to give very good estimates of the forces to be encountered in the prototype situation for scale factors up to the least lambda = 30. The answer to the question of the most appropriate scale factor for model tests is not clear-cut. Performing tests at high scale factors has the advantages that the structures are smaller and therefore easier to build and handle, the carriage and load cells can be more easily made comparatively rigid, and the freezing time for an ice sheet is relatively shortened. On the other hand, performing tests at low scale factors has the advantage that warm-up time is decreased, the energy similarity involved in breaking the ice in flexure is more accurately scaled, the tests tend to appear more realistic and the inaccuracies involved in scaling up model test results by the scale factor are decreased. The confidence with which model tests can be extrapolated to full scale very much depends on these scale factor effects. This article is from 'Proceedings of the General Meeting of the American Towing Tank Conference (20th) Held at Hoboken, New Jersey on 2-4 August 1983. Volume 2,' AD-A144 227. p613-625. Text Ice Sheet Defense Technical Information Center: DTIC Technical Reports database Handle The ENVELOPE(161.983,161.983,-78.000,-78.000) Lambda ENVELOPE(-62.983,-62.983,-64.300,-64.300) |
institution |
Open Polar |
collection |
Defense Technical Information Center: DTIC Technical Reports database |
op_collection_id |
ftdtic |
language |
English |
topic |
*ICE *MODEL TESTS *SCALING FACTOR STRUCTURES INTERACTIONS EXTRAPOLATION CONFIDENCE LEVEL MATHEMATICAL PREDICTION CRUSHING FLEXURAL STRENGTH STRESS ANALYSIS FAILURE(MECHANICS) LOADS(FORCES) SHEETS Component Reports |
spellingShingle |
*ICE *MODEL TESTS *SCALING FACTOR STRUCTURES INTERACTIONS EXTRAPOLATION CONFIDENCE LEVEL MATHEMATICAL PREDICTION CRUSHING FLEXURAL STRENGTH STRESS ANALYSIS FAILURE(MECHANICS) LOADS(FORCES) SHEETS Component Reports Timco,G. W. Model Testing of Structures in Ice: Consideration of Scale Effects |
topic_facet |
*ICE *MODEL TESTS *SCALING FACTOR STRUCTURES INTERACTIONS EXTRAPOLATION CONFIDENCE LEVEL MATHEMATICAL PREDICTION CRUSHING FLEXURAL STRENGTH STRESS ANALYSIS FAILURE(MECHANICS) LOADS(FORCES) SHEETS Component Reports |
description |
The question posed of confidence and scale factor effects of ice model tests is complex. Modelling of the structure is not always straightforward, but in most cases a good representation of the prototype structure can be built. The properties of refrigerated model ice all scale very well, especially if care is taken in choosing the scale factor based on the crushing strength of the ice. Results of structure testing in model ice would seem to give very good estimates of the forces to be encountered in the prototype situation for scale factors up to the least lambda = 30. The answer to the question of the most appropriate scale factor for model tests is not clear-cut. Performing tests at high scale factors has the advantages that the structures are smaller and therefore easier to build and handle, the carriage and load cells can be more easily made comparatively rigid, and the freezing time for an ice sheet is relatively shortened. On the other hand, performing tests at low scale factors has the advantage that warm-up time is decreased, the energy similarity involved in breaking the ice in flexure is more accurately scaled, the tests tend to appear more realistic and the inaccuracies involved in scaling up model test results by the scale factor are decreased. The confidence with which model tests can be extrapolated to full scale very much depends on these scale factor effects. This article is from 'Proceedings of the General Meeting of the American Towing Tank Conference (20th) Held at Hoboken, New Jersey on 2-4 August 1983. Volume 2,' AD-A144 227. p613-625. |
author2 |
NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) |
format |
Text |
author |
Timco,G. W. |
author_facet |
Timco,G. W. |
author_sort |
Timco,G. W. |
title |
Model Testing of Structures in Ice: Consideration of Scale Effects |
title_short |
Model Testing of Structures in Ice: Consideration of Scale Effects |
title_full |
Model Testing of Structures in Ice: Consideration of Scale Effects |
title_fullStr |
Model Testing of Structures in Ice: Consideration of Scale Effects |
title_full_unstemmed |
Model Testing of Structures in Ice: Consideration of Scale Effects |
title_sort |
model testing of structures in ice: consideration of scale effects |
publishDate |
1983 |
url |
http://www.dtic.mil/docs/citations/ADP003819 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADP003819 |
long_lat |
ENVELOPE(161.983,161.983,-78.000,-78.000) ENVELOPE(-62.983,-62.983,-64.300,-64.300) |
geographic |
Handle The Lambda |
geographic_facet |
Handle The Lambda |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/ADP003819 |
op_rights |
APPROVED FOR PUBLIC RELEASE |
_version_ |
1766031783748435968 |