2 edition of Constitutive modeling of ice rubble in first-year ridge keel found in the catalog.
Constitutive modeling of ice rubble in first-year ridge keel
|Series||VTT publications -- 536., VTT julkaisuja -- 536.|
|Contributions||Valtion teknillinen tutkimuskeskus.|
|The Physical Object|
|Pagination||142 p. :|
|Number of Pages||142|
ISBN: Arctic Technology Conference Houston, Texas, USA 10 - 12 February Observations reveal that the decrease in ice thickness through melting in summer is much more rapid for ridges than for surrounding level ice. A physical model that represents internal melting within ridge keels has been developed to explain this observed draft-dependent ablation for first-year pack ice in the Beaufort Sea. The porous structure of a ridge keel permits percolation of a.
() On the decay of first-year ice ridges: Measurements and evolution of rubble macroporosity, ridge drilling resistance and consolidated layer strength. Cold Regions Science and Technology. vol. The probability density of fluctuations had lognormal form, indicative of multiple-scattered incoherent returns for all targets, including calm ice-free water, uniform growing first-year ice, and ridge keels. Median values of the scattering coefficient ranged from − dB for calm water to −30 dB for thick level ice and ridge keels.
Loads due to First Year Ice Ridges on a Vertical Cylinder. David Molyneux, Don Spencer, Protection of Subsea Pipelines Against Ice Ridge Gouging in Conditions of Substantial Surface Ice. Stanislav Duplenskiy, Ove Tobias Gudmestad. Different Ways of Modeling Ice Drift Scenarios in Basin Tests. Andrea Haase, Peter Jochmann. Static and kinetic friction play a fundamental role in sea-ice mechanics. The coefficient of static friction increases with hold time under normal load and is modelled in terms of creep and fractur.
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Heinonen, Jaakko. Constitutive Modeling of Ice Rubble in First-Year Ridge Keel. Espoo VTT Publications p. Keywords sea ice, ice ridges, ice rubbles, ridge keels, loading tests, punch shear tests, modeling, material models Abstract In-situ full-scale loading tests were conducted in the Northern Gulf of Bothnia in.
Download Citation | Constitutive Modeling of Ice Rubble in First-Year Ridge Keel | In-situ full scale loading tests were conducted in the Northern Gulf of Bothnia in order to measure the ridge Author: Jaakko Heinonen. The average keel depth varied from to m while the corresponding effective thickness of rubble under the platen varied from to m.
A continuum material model for ice rubble was developed and implemented into commercial finite element software ABAQUS/ by: Constitutive modeling of ice rubble in first-year ridge keel.
The constitutive law was written in similar form to that used in the plasticity theory based on the strain decomposition into elastic and plastic parts. The shear cap yield surface with evolution laws both for cap hardening and cohesive softening describe also the compaction Author: Jaakko Heinonen.
Constitutive Models for Sea Ice Rubble in First Year Ridges: a Literature Review First-year ice ridge. b) Multiyear ice ridge, from Cammaert (). shapes. The overall shape of ridges can be quite variable and non-symmetrical.
The sail and keel of first-year ridges are usually triangular in shape, while the keel of multi-year ridges. Research Highlights Scale model experiments of ice ridge impact on subsea structures are simulated.
Non-linear Eulerian finite element, rubble described by the Drucker-Prager model. The numerical model is able to estimate the rubble action and deformed shape. Only slight dilatation and a progressive failure occur in the rubble. Effect of rubble friction angle is more significant than it is in.
 Heinonen, J. Constitutive modeling of ice rubble in first-year ridge keel: PhD Thesis, Helsinki University of Technology, ().  Liferov, P., Jensen, A. and Høyland, K.V. 3D finite element analysis of laboratory punch tests on ice rubble () Proceedings of the 17th International Conference on Port and Ocean Engineering.
The finite element formulation and the numerical treatment of the constitutive law are discussed. Constitutive Modeling of Ice Rubble in First-Year Ridge Keel. A continuum material model. As ridges form when two ice sheets collide, ridges are often elongated in the horizontal plane.
In a typical vertical cross-section of such an elongated ridge (), three parts can be identified: Ridge keel is the underwater pile of loose or partly consolidated sail is the small but visible, above-water part of the ridge.
The third part, the consolidated layer at the waterline. The measured load-displacement relationship can be used for the evaluation of rubble properties and also for the model validation. Ridge keel punch tests were carried out in the Bothnian Bay Title: Principal investigator at VTT.
height, keel depth to keel width, and keel area to sail area are often given (see Timco and Burden  for a summary of ridge geometries). Typical keel depth/sail height ratios are / for first-year/multiyear ridges. The porosity h is another important characteristic; it is usually defined as the ratio of the volume of any non-sea.
damage mechanics formulation is used as constitutive model for ice rubble. Material is important to know the strength of first year ridges. Sea ice ridges are common ice features ridge sail and the one below is called ridge keel. When outside temperature is below the. Constitutive Modeling of Ice Rubble in First-Year Ridge Keel,” Ph.D.
thesis, Helsinki University of Technology, Espoo, Finland, VTT Technical Research Center of Finland Publication No. The ridge is often divided into three parts: sail (above the water level), consolidated layer and keel (below the water level).
The sail and keel contain a pile of broken ice blocks, i.e. ice rubble. Hence, the ridge is a porous feature in which the cavities in the keel are filled by water and slush, while in the sail part they contain snow and.
J Heinonen, Constitutive modelling of ice rubble in first year ridge keel, Doctor of Technology Dissertation. Univ of Helsinki, Univ of Helsinki,  Becker, P.
The blocks of ice rubble accumulate to form the ridge sail and keel. During the simulations the energy consumed in ridge growth, including dissipation, is explicitly calculated.
On the basis of the results of simulations performed with the model, the ridging process can be divided into four distinct stages. The use of DEM to study the interaction between ridges and offshore structures has included modelling ridges as thick areas between thinner level ice, load transmission from level ice, through rubble resting on a flat surface, on a structure, ridge keel deformation during sea bottom scouring, loads on conical structures [82–84] and loads.
Heinonen, Jaakko. Constitutive Modeling of Ice Rubble in First-Year Ridge Keel. Tillander, Kati. Utilisation of statistics to assess fire risks in buildings. + app. 37 p. Wallin, Arto. Secure auction for mobile agents.
The FE-model described the ridge: the sail and keel consisting of ice rubble and the consolidated layer close to the waterline. A selected ridge-interaction event was simulated with a simplified geometry, based on measurements carried out in the STRICE project.
The ridge. Title: Constitutive modeling of ice rubble in first-year ridge keel Author(s): Heinonen, Jaakko Date: Series: VTT publications, | Doctoral dissertation (monograph Title: Damage mechanics model for brittle failure of transversely isotropic solids: finite element implementation Author(s): Kolari, Kari Date:.
Finding first year ice ridge rubble properties are of great interest since activities of exploration and production of hydrocarbons in arctic area increased. Design load level of offshore structures in arctic and sub-arctic area depends on first year ridge properties.
Ice ridges are composed of consolidated and unconsolidated parts.Polojarvi, A. Sea ice ridge keel punch through experiments: model experiments and numerical modelling with discrete and combined fi nite-difference element methods. Aalto University publication series.
Doctoral Dissertations 50/ Shestov, A. The Role of the Thermodynamic Consolidation of Ice Ridge Keels in the Seabed Gouging Process.Constitutive modeling of ice rubble in first-year ridge keel. Doctoral Thesis, TKK. VTT Publications Espoo, Finland. Numerical prediction of first year ice ridge loads on floating offshore structures.
In Arctic Technology Conf., OTC Houston, Texas. Preliminary 3D DEM simulations on ridge keel resistance on ships.