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crushing failure during icestructure interaction

CHAPTER 6 Ice Force on Structures 6-1. Introduction - PDHonline

ice sheet. The forces are estimated for one, two, or all possible failure modes, and the failure mode with the lowest estimated force is assumed to occur at the ice-structure interface. At times, it may be necessary to conduct model tests to simulate an ice-structure interaction to determine the interaction forces.

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CHAPTER 6 Ice Force on Structures 6-1. Introduction - PDHonline

An ice sheet fails by crushing, splitting, bending, buckling, or a combina- tion of these modes. For a given failure mode and structure shape, theoretical formulations or experimental results, along with ice properties, are used to estimate the forces required to fail an ice sheet.

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Offshore Structures in Ice-Infested Waters - EOLSS

that influence the ice load during an ice-structure interaction, such as the ice thickness, ice type and the failure mode when an ice interacts with a structure, i.e. bending or crushing. In the past several decades, many engineers and scientists have spent significant efforts on this topic. Their work is briefly discussed in Section 4.

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Numerical Simulation of Ice Milling Loads on Propeller Blade With ...

Both crushing and fracture failures are included in the ice- propeller milling process. The ice loads in 6 Dofs acting on blades of a propeller are calculated in time domain. The average and standard deviations of simulated dominant ice loads are compared with those from model test. A good agreement is achieved. By varying

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1 A Non-simultaneous Dynamic Ice-structure Interaction Model 2 ... - Strath

20 To simulate non-simultaneous ice failure effects on ice-structure interaction, an extended dynamic Van der Pol 21 based numerical model is developed. The concept of multiple ice failure zones is proposed to fulfil non- 22 simultaneous crushing characteristics. Numerical results show that there is more simultaneous force acting on

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Offshore Wind Turbine Vibrations Utilizing a Tmd System

ice-structure interaction in the ice crushing regime. During the interaction, the large ice load not only pushes the structure to move, but also leads to the crushing failure of the ice at the contact area. This phenomenon has three distinct modes, which depends on the ice velocity, as is shown in Figure 1.1. If the ice speed is slow ...

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A Spectral Model for Forces Due to Ice Crushing

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.

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Theory - ArcISo

A multi-body dynamic module taking into account ice - ice and ice - structure contacts; A fracture module predicting the fracture of sea ice during the interactions; A hydrodynamic module offering solution to hydrodynamics during ice - structure interactions. These three different modules are featured by the following innovations:

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Dynamic Analysis of Monopile-Type Offshore Wind Turbine Under ... - DOAJ

Then, the dynamic response and damage of the OWT structure during ice-structure interaction are studied using the fully interaction model with FSI coupling. The simulated ice force can produce a significant vibration response in the structure coupling with FSI due to occurrence of ice-induced resonance in the ice velocity range of 2.5-3.5 cm/s.

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Discrete Chaotic Ice Failure Model Incorporating Extrusion Effects

Discrete Chaotic Ice Failure and Extrusion 7Daley R&E Figure 6. Flake geometry in contact model for the limiting case. Failure will occur on the plane of the crack when the shear stress exceeds the failure value specified by the Coulomb failure criteria as: =cpτfail −⋅tan( )φ (8) Using Eq. 2, 3 and 4, c becomes: () cp L Y X =c −− −

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Flow of Crushed Ice: Physical and Mechanical Properties and Behaviour ...

ways, depending on the interaction geometry, velocity, and ice properties. When compressive stresses induce crushing failure, the broken ice pieces are often of the order of grain size or smaller. Observations of crushing events indicate that a crushed ice layer of varying degrees of thickness is always

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Ice edge failure process and modelling ice pressure

When a structure indents an ice edge, the ice edge is described to fail in 'crushing'. Figure 1 shows the crushing of an ice edge when a ship is progressing in ice and the ice failure when ice cover drifts against a vertical pile or wall. Both cases show extrusion of apparently finely broken ice.

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Implementation of ISO 19906 for probabilistic assessment of global sea ...

Ice failure during ice-structure interactions is a complex process and the development and improvement of ice load models is challenging, in large part because of difficulties obtaining full-scale data and scaling issues when extrapolating from model test data. The ISO 19906 standard provides guidance for the calculation of design ice loads on offshore structures in Arctic and subarctic ...

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Modal Analysis of the Ice-Structure Interaction Problem - Virginia Tech

The interaction of ice with offshore structures is an important topic due to the interest of the major oil companies worldwide in developing previously unexplored arctic regions. Added impetus for the study of ice-structure interaction is given by bridge construction in those same arctic regions.

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Crushing failure during ice-structure interaction - ScienceDirect

The force required to fail an ice feature against a structure generally limits the interaction force resulting from a relative motion between them. An ice sheet may fail against a structure in bending, buckling, crushing, or a combination of these failure modes.

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Water | Free Full-Text | Research on Mooring System Design for Kulluk ...

Mooring system design of a floating offshore structure in the arctic region is considered to be extremely important. This paper aims at investigating an optimal mooring system for the Kulluk platform operating in the Beaufort Sea, which has ice-free and ice-covered conditions during the whole year time. In order to complete the layout design of the mooring system to satisfy the year-round ...

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Ice-Structure Interaction: IUTAM/IAHR Symposium St. John's ...

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. Dr. Muggeridge readily agreed and prepared a proposal that was endorsed by the CNC and presented to the General ...

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(PDF) Comparison of Characteristic Failure Frequency Models for Ice ...

Part of the differences in these approaches stem from the difference in the failure mode of the ice, whether in compression or bending. Within the spectre of. Several modelling approaches have been proposed for the modelling of ice-induced vibrations. Part of the differences in these approaches stem from the difference in the failure mode of ...

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10.1016/jldregions.2010.11.002 | DeepDyve

During full-scale interactions with ice in compression, most of the load is transmitted to a structure through high-pressure zones ( hpz s) that are distributed in the interaction area. These hpz s are entities formed due to localization of contact resulting primarily from local fracture processes; highly confined ice near the center of a hpz ...

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A review of discrete element simulation of ice-structure interaction ...

The failure process is affected by both the structure and the ice, thus is called ice-structure interaction. Many ice failure processes, including ice failure against inclined or vertical offshore structures, are composed of large numbers of discrete failure events which lead to the formation of piles of ice blocks.

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Literature Review of Dynamic Ice-structure Interaction Models - UKDiss

At this point, both ice and the structure are in elastic deformation and strain energy is stored with some of the energy being dissipated due to ice failure. At some point, when the crushing limit is reached, ice collapses. This causes a sudden decrease in the contact force and the structure swings back as the strain energy is released.

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Two!dimensional discrete element simulations of icestructure interaction

of the interaction between a moving ice sheet and a ~exible stationary structure[ The discrete element technique accounts for the generation of failure within an initially intact ice sheet[ The failure of the ice corresponds to situations where the ice can exhibit combinations of brittle fragmentation and viscoplastic

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Discrete Element Modelling of Interaction Between Sea Ice and Vertical ...

The interaction between ice cover and vertical offshore structures was simulated with DEM, and the ice loads on vertical structure with various pile diameters were obtained. This investigation will benefit the rational design of new offshore structures and the fatigue life estimation of existing structures in ice-covered regions. Keywords:

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On the development of ice-water-structure interaction

Huang Y., Shi Q., Song A. Model test study of the interaction between ice and a compliant vertical narrow structure [J]. Cold Regions Science and Technology, 2007, 49(2): 151-160. Google Scholar Sodhi D. S. Crushing failure during ice-structure interaction [J]. Engineering Fracture Mechanics, 2001, 68(17-18): 1889-1921.

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JMSE | Free Full-Text | Distribution Analysis of Local Ice ... - MDPI

At high loading speeds, the sea ice is mainly in brittle failure mode, with the sea ice forming wedge-shaped crushing cracks. Then, the sea ice splits and spalls on the upper and lower surfaces due to the cracks [ 20, 22, 23 ]. This results in different pressure distributions.

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Physical mechanism of ice-structure interaction

To obtain the effect of velocity and structural natural frequency (structural stiffness) on ice failure, an extended dynamic Van der Pol based single degree-of-freedom ice-structure interaction model is developed. Three basic modes of response were reproduced: intermittent crushing, frequency lock-in and continuous crushing.

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Stochastic subspace identification of modal parameters during ice ...

Structures with sloped walls at the ice-structure interface typically promote a flexural type of ice failure, while vertically sided structures typically promote crushing failure. Thus, sloped-walled structures are subject to significantly lower ice forces than vertically sided structures, but they often incur a higher construction expense [ 5 ].

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Crushing failure during ice-structure interaction - ResearchGate

During crushing, the load is transferred from the ice to the structure through high pressure zones (HPZ) forming across the ice-structure interaction area [37, 81]. Spalling and aking creates a...

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10.1016/S0165-232X(01)00021-0 | DeepDyve

These video cameras provided a means of continuously documenting ice/structure interactions along the Molikpaq's walls, particularly on its north and east faces. ... They are, in fact, lower than many of loads experienced during crushing failures in level first-year ice, where loads up to 140 MN were reported (Wright and Timco, 1994) . The ice ...

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NUMmerical Analysis of ice load on taradlsvikfossen dam 25th IAHR ...

A spring-dashpot model to account for buoyancy and drag acting on ice sheet/ice blocks during ice-structure interaction. Contact kinematics. A Coulomb friction model is employed, and the sticking force limit is a function of the friction coefficient and the contact forces normal to the interacting surfaces. 20-09-2021

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Frontiers | Dynamic analysis of offshore wind turbines subjected to the ...

Ice loads are an important and decisive factor for the safe operation of offshore wind turbines (OWTs). In severe environment load cases, it shall lead to prominent ice-induced vibration and ice-induced fatigue failure of OWT structures. Based on the cohesive element method (CEM) and considering the pile-soil interaction used by nonlinear distributed springs, the full interaction model of ...

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Fracture Analysis of Ice Forces | Journal of Cold Regions Engineering ...

The magnitude of the ice‐structure interaction force makes the ice fail in one of many possible failure modes of ice. Crack propagation, which is one of the most significant failure modes of ice, is analyzed in this work. A crack in an ice sheet will propagate when the stress intensity factor equals the fracture toughness of ice.

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A dynamic Ice-structure Interaction Model for Prediction of Ice ... - CORE

Level ice acting on a vertically sided offshore structure may induce several kinds of interactions, depending on ice properties and structural properties [2-3]. When a drifting ice floe brushes against an offshore structure, ice crushing failure is the most common fail- ure mode.

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Frontiers | Dynamic Analysis of Monopile-Type Offshore Wind Turbine ...

Mar 11, 2022Yue and Bi (2000) shown that the collision between sea ice and vertical structures often causes crushing or buckling failure, among which crushing failure is relatively larger and would cause ice-induced vibration. The frequency of ice loads with varying breaking lengths in full-scale was studied by Suominen et al. (2017).

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Analysis of Medium-Scale Laboratory Tests on Ice Crushing Dynamics ...

Nine tests were performed to investigate the effect of ice temperature and indenter size on ice failure processes associated with high-pressure zone formation and evolution during dynamic ice crushing tests. Ice failure events were observed from regular and high-speed video synchronized with LVDTs and load cell data.

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Damage and microstructural change in laboratory grown ice under ... - CORE

Ice-structure interactions, where crushing is the predominant mode of failure, are characterised by zones of intense high pressure within the ice feature. This work investigates the mechanical and microstructural behaviour within these zones by using triaxial testing on laboratory grown freshwater granular ice.

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Laboratory experiments to study ice-induced vibrations of scaled model ...

Laboratory experiments to study ice-induced vibrations of scaled model structures during their interaction with level ice at different ice velocities ... the structure and the ice edge is performed on a smaller time scale by comparing the locally measured pressures at the ice-structure interface to the identified structural responses and forces ...

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Title: Theory and numerical modelling of dynamic ice-structure ...

In the third stage, a two-dimensional non-simultaneous ice failure model is developed. The concept of multiple ice failure zones is proposed to fulfil non-simultaneous crushing characteristics. The size of ice failure zone is assumed to become smaller with increasing ice velocity, which increases the occurrence of non-simultaneous ice failures.

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Frontiers | Experimental Investigation on Uniaxial Unconfined ...

Mechanical deicing is a method to remove the ice on the pavement surface, and the ice strength directly affects the difficulty and effectiveness of the mechanical deicing. This paper aims to investigate the compression strength of ice to facilitate the deicing equipment to crush ice. In this paper, a large-scale freezing laboratory is employed to simulate low-temperature environment, and the ...

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Stochasticsubspace identificationofmodal parametersduring ice ...

Several types of ice-structure interactions against vertically sided structures are considered in this study, and they are illustrated in figure 1. Readers are recommended to refer to [23]foran overview of the mechanics of ice-structure interaction and [24] for descriptions of the observed failure types against the Norströmsgrund lighthouse.

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