2 edition of Dynamic ice-structure interaction during continuous crushing found in the catalog.
Dynamic ice-structure interaction during continuous crushing
by US Army Corps of Engineers, Cold Regions Research & Engineering Laboratory in [Hanover, N.H.]
Written in English
|Statement||Mauri Määttänen ; prepared for U.S. Army European Research Office.|
|Series||CRREL report -- 83-5.|
|Contributions||United States. Army. European Research Office., Cold Regions Research and Engineering Laboratory (U.S.)|
|The Physical Object|
|Pagination||iv, 48 p. :|
|Number of Pages||48|
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Ice-structure interaction. Vitenskapelig, faglig og kunstnerisk arbeid. A continuum model of large deformation continuous ductile ice crushing. Laboratory experiments to study ice-induced vibrations of scaled model structures during their interaction with level ice at different ice velocities. Professor, Key Laboratory of Structures Dynamic Behavior and Control of the Ministry of Education, Key Laboratory of Smart Prevention and Mitigation of Civil Engineering Disaster of the Ministry of Industry and Information Technology, Harbin Institute of Technology, Haihe Rd., Nan’gang District, Harbin , China (corresponding author).
The new model ice will mainly be applied in ice-structure interaction tests but can also be used for ship tests in which local crushing failure occurs. One important aspect in this matter was the ice failure mode during the interaction with the structure. In the end an optimized substructure was to be designed for offshore wind turbines. Hibond 55 Formwork Tables are based on design checks for bending, web crushing, vertical shear, combined actions and deflection. Hibond 55 sheets must be laid in one continuous length between permanent supports. Short steel decking sheets of Hibond 55 must never be spliced together to achieve the span between temporary or permanent supports.
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DTIC ADA Dynamic Ice-Structure Interaction During Continuous Crushing, Item Preview. Get this from a library. Dynamic ice-structure interaction during continuous crushing. [M Määttänen; Dynamic ice-structure interaction during continuous crushing book States.
Army. European Research Office.; Cold. These measurements provided comprehensive data on the dynamic ice-structure interaction during crushing failure of an ice sheet.
Three basic modes of ice behavior were observed: creep deformation at low velocities, intermittent crushing at intermediate velocities, and continuous crushing at high by: Records of field observations at the Molikpaq structure show that continuous brittle crushing took place when an ice sheet moved against the structure at a high speed, transforming an intact ice sheet to a heap of crushed ice by: During a typical cycle of the dynamic ice–structure interaction at intermediate speeds, the ice–structure interaction results in variable rates of indentation into the ice, and the tactile sensor.
Observations on dynamic ice-structure interaction. deformation and failure during continuous brittle crushing are i n fact the same a s for rigid structures at high ice. Observations on dynamic ice-structure interaction When a vertically sided compliant structure interacts with an ice floe, this can result in structural vibrations known as ice-induced vibrations.
Three regimes of ice-induced vibrations are commonly distinguished: intermittent crushing, frequency lock-in, and continuous brittle crushing.
Additionally, the behavior of the ice-structure interaction is studied mathematically to understand the cyclic dynamic ice-loading applied on offshore structures during continuous ice crushing.
Multiple inverse algorithms are presented for calculating the variable ice pressure acting on a stiffened steel plate.
Dynamic ice structure interaction can develop while moving level ice is breaking in crushing mode against a fixed offshore structure. The structure responds to. A one-dimensional finite element is developed to represent the continuous crushing and extrusion of ice in interactions with offshore structures.
The element is developed with the objective of providing a model for the analysis of dynamic ice–structure interactions in which both nonsimultaneous and phase-locked behaviours occur. The continuous ice crushing on the columns and thereby the dynamic ice-structure interaction may usually happen during the ice season resulting in sustained violent vibrations of the structures.
The paper first introduces the ice-induced vibration analysis of the suction foundation platform by using the self-excited vibration theory. Ice crushing dynamics in ice structure interactions can result in hazardous vibrations and potentially damaging loads on offshore structures.
Ice cone crushing experiments were conducted in the lab to characterize loading and dynamics processes for compressive failure. This paper presents a model of dynamic ice forces on vertical offshore structures.
The model concerns a loading scenario where a competent ice sheet is drifting and crushing against the structure. Full scale data obtained on two offshore structures were used in the derivation of a method that applies both to narrow and wide structures.
IUTAM-IAHR Symposium on Ice-Structure Interaction Professor Bez Tabarrok, Chairman of the Canadian National Committee (CNC) of the International Union of Theoretical and Applied Mechanics (IUTAM) invited Professor Derek Muggeridge to organize a symposium on ice structure interaction.
numerical investigations on the ice-structure interaction. In this paper, a 3D numerical model is established by combining cohesive element method (CEM) with an elastoplastic softening constitutive model to simulate continuous icebreaking process in level ice.
The local crushing. Interfacial Study of Input Data in Dynamic Ice-Structure Interaction and Evaluation of Tactile Sensors Usability in Ice-Related Problems in contact area were observed during tendencies to frequency lock-in.
Line-like contact tended to prevail in continuous brittle crushing. Trends in time-history plots of experimental data with theoretical.
continuous columnar ice, and granular ice. Both the porosity within the ice and the grain structure significantly influence the mechanical properties of the ice. Various books (e.g., MichelAshtonCammaert and MuggeridgeSanderson ) cover the subjects of formation and types of ice, as well as ice properties.
Results show a successful identification of the level-ice forces for both the intermittent and continuous brittle crushing regimes, even when significant modeling errors are present. The ice-induced displacements of the structure identified in conjunction with the forces are also compared to those measured during the experiment.
A selection of recent journal publications, artistic productions, books, including book and report excerpts. Stochastic subspace identification of modal parameters during ice–structure interaction. Philosophical Transactions of the Royal Society A: A continuum model of large deformation continuous ductile ice crushing.
Nord, E. Lourens, M. Määttänen, O. Øiseth et al., “ Laboratory experiments to study ice-induced vibrations of scaled model structures during their interaction with level ice at different ice velocities,” Cold Reg. Sci. Technol.1– 15 (). Ice forces generated during an ice–structure interaction are related to ice thickness and properties by conducting analytical or small-scale experimental studies, or both.
Field measurements of ice forces have been made to assess the validity of theoretical and small-scale experimental results.The elastic behavior of ice is characterized by moderate anisotropy. At temperatures near the melting point, Young's modulus 23 of single crystals varies by less than 30%, from 12 GPa along the least compliant direction (parallel to the c-axis) to GPa along the most compliant direction (inclined to both the c- and a-axes).
Along directions within the basal plane Young's modulus is 10 GPa.Ice crushing against such type of slender structures is known to cause both linear and non-linear types of dynamic interaction of which frequency lock-in is the most significantly non-linear.