Hydrodynamic model of the impact of a solid on ice

Kurdyumov, V. A.; Kheisin, D. E.

doi:10.1007/bf00885056

Cited by 13 publications

(10 citation statements)

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“…The suggested value for viscosity (μ = 0.1 MPa s) has been found to be reasonable in other investigations (e.g. Jordaan and others, 1988), and is also in the range suggested by Kurdyumov and Kheisin (1976). This is an area where further experimental work is urgently needed.…”

Section: The Crushed Ice Layersupporting

confidence: 83%

“…The flow of the crushed ice will now be modelled as that of a Newtonian fluid in which the shear stress is given by where μ = coefficient of viscosity, and = rate of shear strain. Analysis of crushed ice in a single impact (constant layer thickness) treating the crushed material as a viscous fluid has been carried out by Kurdyumov and Kheisin (1976) and used in analysis of iceberg impact forces by Nevel (1986). An extension to the case of spherical indenters with continuous indentation is given in Jordaan and others, 1988).…”

Section: The Crushed Ice Layermentioning

confidence: 99%

“…There have also been a number of experimental investigations in the laboratory using model ice, primarily by Määttänen (1983) and Sodhi and Morris (1986). A number of researchers have investigated the crushing process in terms of the energy processes involved (Kheisin and Likhomanov, 1973; Kurdyumov and Kheisin, 1976; Jordaan, 1986, 1987; Kivisild and Blanchet, 1987; Timco and Jordaan, 1987; Jordaan and others, 1988). Most recently, Jefferies and Wright (1988) presented a very interesting paper on the crushing of ice against the Molipaq structure in the Canadian Beaufort Sea.…”

Section: Introductionmentioning

confidence: 99%

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Dynamics of the Ice-Crushing Process

Jordaan¹,

Timco²

1988

J. Glaciol.

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During fast indentation tests on ice sheets at constant rates, crushing is commonly observed at appropriate combinations of speed and aspect ratio. An analysis is made of this mode of failure, using as a basis a recently conducted test on an ice sheet under controlled conditions. The variation of load with time is given special attention, and cyclic variation of load is associated with periodic crushing (pulverization) events, followed by clearing of the crushed ice particles. An analysis of the clearing process is summarized in the paper, treating the crushed ice as a viscous material. A detailed analysis of the energy exchanges during the indentation process is given. Elastic variations of stored energy in the indenter and in the ice sheet are calculated; these are relatively minor. The dissipation of energy during a typical load cycle (3 mm movement during 0.05 s) is about 8 J. The energy required to create surfaces of the crushed ice particles is small (0.006 J), as is the work of crushing based on mechanical testing (0.09 J). It is concluded that the process of viscous extrusion of crushed ice is the main seat of energy dissipation, basically as a frictional process. A relationship for the mean thickness of the crushed ice layer is developed, based on energy-balance considerations.

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Section: The Crushed Ice Layersupporting

confidence: 83%

Section: The Crushed Ice Layermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dynamics of the Ice-Crushing Process

Jordaan¹,

Timco²

1988

J. Glaciol.

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“…A formulation that was developed in view of ship ice loads is based on the assumption of a crushed ice layer between the structure and intact ice; see, for example Kurdjumov & Kheisin [ 33 ]. Figure 27 illustrates the crushed ice layer.…”

Section: Models Of Ice-induced Pressurementioning

confidence: 99%

Ice edge failure process and modelling ice pressure

Riska¹

2018

Phil. Trans. R. Soc. A.

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Ice action on ships and offshore structures is commonly determined by calculating the contact ice pressure. The aim of this paper is to describe the empirical background for determining the ice pressure. This review article describes six different test series where ice edge indentation and contact ice pressure have been investigated. These test series are ice pressure measurements onboard IB Sisu in the Baltic in 1977, pendulum tests carried out at Arctec in Ottawa, Canada, in 1979, laboratory and full scale ice crushing tests at WARC in 1988 and onboard IB Sampo 1989, medium scale indentation tests on Hobson's Choice Ice Island 1990, ice crushing tests at NRC, Ottawa 1992 and the JOIA tests in Hokkaido 1996–1999. These tests were selected as at each series a new phenomenon was observed. The aim of the paper is to introduce the main features for ice–structure contact empirically through the description of tests. The paper is concluded with a short description of the existing models for ice pressure, especially to gain an insight and highlight the main observations in each test series and how the models for ice pressure have developed based on the observations.This article is part of the theme issue ‘Modelling of sea-ice phenomena’.

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“…The observation of a crushed layer of ice in the indentation zone was first reported by Kheisin and his co-workers (Kheisin and Cherepanov, 1973;Kurdyumov and Kheisin, 1976). In 1967, they conducted dropped ball tests using a 300 kg steel ball to impact the surface of an ice sheet at velocities in the range 1-6ms − 1 .…”

Section: Fracture and Damage: Two Distinct Processesmentioning

confidence: 99%