Scale effects on sea ice fracture

Mulmule, S. V.; Dempsey, J. P.

doi:10.1002/(sici)1099-1484(199911)4:6<505::aid-cfm67>3.0.co;2-p

Cited by 24 publications

(12 citation statements)

References 34 publications

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“…Typically, the crack initiation stress is chosen to be the tensile strength of the material. [22][23][24] from the field experiment [25] based on the spirit of the cohesive zone method, viscoelastic fracture theory, and the weight function method. As long as this material property is avail able, it can be adapted to various numerical simulations to model the fracture of the concerned material.…”

Section: Fracture Energymentioning

confidence: 99%

Simulating Ice-Sloping Structure Interactions With the Cohesive Element Method

Lü

Lubbad

Løset

2014

Journal of Offshore Mechanics and Arctic Engineering

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S u sta ina b le A rc tic M a rin e and C oastal T e c h n o lo g y (S A M C oT ), C entre fo r R esearch-Based In n o vatio n (CRI), Hillerborg et al. in Ref. [20] examined the available fracture mechanics theories (stress intensity factor, energy balance approach, and Dugdale and Barrenblatt approaches) to describe crack initiation and propagation in concrete (quasi-brittle mate rial) by means of the finite element approach. Then, they proposed the fictitious crack model (also called cohesive crack model or co hesive zone model), which became popular in various material failure-related simulations. It is a rather simple phenomenological model to generalize the fracture process zone behavior with dif ferent types of material bonding [21]. This model assumes a traction-separation relationship (cohesive law) to describe the linelike (2D) or surfacelike (3D) cohesive zone. There are three Cohesive Zone Method

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Section: Fracture Energymentioning

confidence: 99%

Simulating Ice-Sloping Structure Interactions With the Cohesive Element Method

Lü

Lubbad

Løset

2014

Journal of Offshore Mechanics and Arctic Engineering

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“…in which E is the short-time modulus that can be obtained from the initial slope of the load-crack mouth opening displacement plot and C is as yet left unspecified. The truncated fractional power-law form of the creep compliance in ( 3.1 ) corresponds to a three-parameter fractional linear solid [ 15 ].…”

Section: Creep Compliance Of Sea Icementioning

confidence: 99%

“…The SSC is assumed to be dependent on the separation distance as well as on the rate of separation and the bulk material is considered to be linearly viscoelastic. The procedure used to carry out the match between the model and experiment is shown as a flow-chart in [ 15 ] (see fig. 5 therein).…”

Section: Viscoelastic Fictitious Crack Modelmentioning

confidence: 99%

“…More specifically, for an ENSP with the crack loaded by the pressure p ( x , t ), with x = X / L , a = A / L , the viscoelastic COD is given by in which J ( t ) is the creep compliance, and w e = w e app + w e coh , with and The weight function h r ( a , x ) is treated in detail in [ 19 ]. Many additional details regarding the solution procedure for the VFCM outlined above are detailed in [ 15 , 16 ].…”

Section: Viscoelastic Fictitious Crack Modelmentioning

confidence: 99%

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Tensile fracture of a single crack in first-year sea ice

Dempsey

Cole

Wang

2018

Phil. Trans. R. Soc. A.

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The break-up of sea ice in the Arctic and Antarctic has been studied during three field trips in the spring of 1993 at Resolute, NWT, and the fall of 2001 and 2004 on McMurdo Sound via in situ cyclic loading and fracture experiments. In this paper, the back-calculated fracture information necessary to the specification of an accurate viscoelastic fictitious (cohesive) crack model is presented. In particular, the changing shape of the stress separation curve with varying conditions and loading scenarios is revealed.This article is part of the theme issue ‘Modelling of sea-ice phenomena’.

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“…It has been found that crack-opening displacements involve creep deformation. However, it is hard to measure the creep for fresh water and sea ice, due to the nonhomogeneity of ice in terms of ice grains, brine volumes and other impurities (Mulmule and Dempsey 1999).…”

Section: Crack-opening Displacement δ Cmentioning

confidence: 99%

A new constitutive equation on ice materials

Ince

Kumar

Paik

2016

Ships and Offshore Structures

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The structural crashworthiness analysis involving buckling, plasticity, crushing, and fracture with the strainrate effects is required to evaluate the characteristics of structural deformations and impact energy dissipation at the event of collisions between ships or offshore platforms and icebergs. The constitutive equations of both steels and ice materials should be characterised for numerical computations as the collision impact energy is dissipated by the two colliding and deformable bodies, namely not only ships or offshore platforms but also icebergs. The primary objective of the present study is to examine ice properties and propose a constitutive equation of ice materials which shall be implemented into nonlinear finite element method computations of the structural crashworthiness associated with the collisions. Previous studies are first surveyed in terms of the influencing parameters as the many uncertainties involved make the problem highly complex. The parameters affecting the mechanical properties of ice materials are then discussed. In addition to referencing the existing test database associated with the mechanical properties of ice materials, a new test database is obtained by laboratory testing of the authors' group. Based on findings from the existing and the new test database, a new constitutive equation used for ice materials is proposed associated with quasi-static and impact responses.

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Scale effects on sea ice fracture

Cited by 24 publications

References 34 publications

Simulating Ice-Sloping Structure Interactions With the Cohesive Element Method

Simulating Ice-Sloping Structure Interactions With the Cohesive Element Method

Tensile fracture of a single crack in first-year sea ice

A new constitutive equation on ice materials

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