Untitled

Jordaan, Ian; Matskevitch, Dmitri; Meglis, I.L.

doi:10.1023/a:1018605517923

Cited by 34 publications

(12 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The first implementation of this EB rheology into short (3 days), noadvection, stand-alone pan-Arctic simulations forced by realistic wind forcing from reanalyses was performed with an infinitely slow driving condition (external driving is artificially frozen as long as a damage cascading process proceeds). In agreement with observations, deformation was observed to strongly localize along linear-like features, to be characterized by power-law PDFs, and to follow a scaling relation ε ∼ L −β (1) . Although ice is considered as being elastically isotropic at the grid scale, stress and strain anisotropy spontaneously emerge at larger scales.…”

Section: Modelling the Scale-invariant Brittle Mechanics Of Sea Ice Wsupporting

confidence: 88%

“…As α (1) can be considered as a measure of intermittency, varying between 0 (non-intermittent 'flow') and 1 (extreme intermittency), relation (3.3b) expresses a more continuous sea ice mechanics with increasing spatial scale. Similarly, the measure of spatial localization, β (1), is bounded between 0 (a perfectly homogeneous field) and 2 (a point-like process), and equation (3.3a) reflects a progressive smoothing as one cumulates deformation events decreasingly correlated with increasing time. The unique expression compatible with (3.3a,b) is the following coupled equation [50]:…”

Section: (A) Sea Ice Deformationmentioning

confidence: 99%

“…Fracturing and crushing of saline ice against offshore structures or ship hulls involve even smaller scales, down to internal microstructural defects, such as grain boundaries or brine pockets (e.g. [1]). A clear understanding of these mechanisms is, of course, necessary to estimate ice loads on these structures [2].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Linking scales in sea ice mechanics

Weiss

Dansereau

2017

Phil. Trans. R. Soc. A.

View full text Add to dashboard Cite

One contribution of 11 to a theme issue 'Microdynamics of ice'. Mechanics plays a key role in the evolution of the sea ice cover through its control on drift, on momentum and thermal energy exchanges between the polar oceans and the atmosphere along cracks and faults, and on ice thickness distribution through opening and ridging processes. At the local scale, a significant variability of the mechanical strength is associated with the microstructural heterogeneity of saline ice, however characterized by a small correlation length, below the ice thickness scale. Conversely, the sea ice mechanical fields (velocity, strain and stress) are characterized by long-ranged (more than 1000 km) and long-lasting (approx. few months) correlations. The associated space and time scaling laws are the signature of the brittle character of sea ice mechanics, with deformation resulting from a multiscale accumulation of episodic fracturing and faulting events. To translate the short-range-correlated disorder on strength into long-range-correlated mechanical fields, several key ingredients are identified: long-ranged elastic interactions, slow driving conditions, a slow viscous-like relaxation of elastic stresses and a restoring/healing mechanism. These ingredients constrained the development of a new continuum mechanics modelling framework for the sea ice cover, called Maxwell-elastobrittle. Idealized simulations without advection demonstrate that this rheological framework reproduces the main characteristics of sea ice mechanics, including anisotropy, spatial localization and intermittency, as well as the associated scaling laws.This article is part of the themed issue 'Microdynamics of ice'.

show abstract

Section: Modelling the Scale-invariant Brittle Mechanics Of Sea Ice Wsupporting

confidence: 88%

Section: (A) Sea Ice Deformationmentioning

confidence: 99%

See 1 more Smart Citation

Linking scales in sea ice mechanics

Weiss

Dansereau

2017

Phil. Trans. R. Soc. A.

View full text Add to dashboard Cite

show abstract

“…Considering that the upper limit should be used in practical applications, a dynamic failure strain criterion related to the rate-independent and cumulative plastic strain is used in this paper to define the failure of the element. The criterion originates from Jordaan's empirical formula [29] and is used by Liu [19] and Gao [20], as shown in formula (10, 11) 2 , and p cut is the truncated stress. In addition, taking the tensile strength into consideration, the tensile strength limit is 2 MPa.…”

Section: Ice Materials Model Considering the Temperature Effectsmentioning

confidence: 99%

Establishment and Verification of a Constitutive Model of Ice Material Considering the Effect of Temperature

Yu¹,

Liu²,

Wang³

et al. 2020

JMSE

View full text Add to dashboard Cite

The increase in global warming has secured the arctic region as a research hotspot, and the existence of ice floes and massive icebergs poses a great challenge to the navigational safety of polar ships. For the finite simulation of ship–ice collisions, a reasonable description of the ice constitutive model is the most important factor for the accuracy of ice load prediction and structural deformation assessment. Due to the complex physical properties of natural sea ice materials, there are still many difficulties in achieving a widely accepted ice material model. In this paper, a constitutive model of ice material considering the influence of temperature is established and embedded into finite element software LS-DYNA, and the material property parameters are validated and analyzed. Then, the drop test in a published paper is recapitulated by the numerical simulation with the proposed method, and the results are compared. Good agreement is attained between the numerical simulation and published results. The influences of temperature and drop height are discussed, and the results show that both of them have an important effect on structural deformation. The research results can be used for ice load prediction and polar ship structure design.

show abstract

“…Sand (2008) employed plastic models to represent brittle cracking and the subsequent crushing by significantly lowering the strength parameters of the failing elements at the point of failure. Jordaan et al (1999) and Taylor and Jordaan (2014) utilised a two-term damage mechanics model, which represents both brittle and ductile behaviour simultaneously and aims to capture the phenomena occurring during high-speed compressive failure of ice. Low and high confinement processes were treated separately with separate damage variables.…”

Section: Damage Mechanics Modelsmentioning

confidence: 99%