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Author: | Muhonen, Ari |
Title: | Evaluation of Three Ice-Structure Interaction Models |
Kolmen jään ja rakenteen vuorovaikutusta kuvaavan mallin arviointi | |
Publication type: | Licentiate thesis |
Publication year: | 1996 |
Pages: | 90 Language: eng |
Department/School: | Konetekniikan osasto |
Main subject: | Laivanrakennusoppi (Kul-24) |
Supervisor: | Riska, Kaj |
Instructor: | |
Electronic version URL: | http://urn.fi/urn:nbn:fi:tkk-003921 |
OEVS: | Electronic archive copy is available via Aalto Thesis Database.
Instructions Reading digital theses in the closed network of the Aalto University Harald Herlin Learning CentreIn the closed network of Learning Centre you can read digital and digitized theses not available in the open network. The Learning Centre contact details and opening hours: https://learningcentre.aalto.fi/en/harald-herlin-learning-centre/ You can read theses on the Learning Centre customer computers, which are available on all floors.
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Location: | P1 Ark TKK 5700 | Archive |
Keywords: | ice-structure interactions loading dynamic loads laboratory tests freshwater ice ice crushing mathematical models simulation evaluation |
Abstract (eng): | This work concentrates on the contact between an ice edge and a vertical indenter face during intermittent crushing. The results of a laboratory indentation test series are analyzed and a description of the physical phenomena occurring at the contact is given. The existing dynamic ice-structure interaction models are reviewed. The ability of three models to simulate representative test results is evaluated. The results of the indentation test series consist of 77 tests of which 23 are analyzed. The tests were carried out in a small basin with a floating sheet of columnar grained freshwater ice. The ice was horizontally loaded with an indenter which was installed in front of a spring-mass system. Special attention was paid to the visual observations in order to find the physical phenomena occurring at the ice deformation process. The ice failure process was cyclic in the whole analyzed parameter space. The apparent crushing frequency was dependent on the indenter velocity and the lowest natural frequency of the structure. The latter also affected the peak force values: the higher the natural frequency the lower the force. The ice failed in flaking. The flakes were formed locally by different size macrocracks which separated the flakes from the parent ice. This lead to a chain reaction which caused the deformation of the whole contact face during the load drop. The resulting ice wedge was crushed during the spring-back phase following the load drop. The results of three representative tests were simulated using three different type dynamic ice-structure interaction models. None of the models performed well when the needed parameter values were obtained straight from the tests or the test conditions. However, when the parameter values were modified, the match improved considerably. |
ED: | 2004-09-23 |
INSSI record number: 32741
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