Evaluation of moving ice loads on an elastic plate

Kim, Hyunwook; Quinton, Bruce

doi:10.1016/j.marstruc.2016.07.007

Cited by 12 publications

(5 citation statements)

References 8 publications

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“…Substituting Equation (38) into Equation (37), the relationship between the crushing length of ice floe and the ice loss velocity parameters V i is obtained…”

Section: Design Formula For Plating Thickness Under Ice-impact Loadmentioning

confidence: 99%

A New Plastic Design Approach for the Vertical-Side-Plating Thickness of Ice-Strengthened Ships Suffering from Ice Floe Impacts

Mu,

Guo,

Cai

et al. 2024

JMSE

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Ice-strengthened ships inevitably suffer from ice floe impacts during navigation in icy regions. Under some extreme-ice-impact loadings, the ship structure will experience plastic deformations. The magnitude of plastic deformation is highly correlated with the ice floe-impact energy level. During most ice impacts, only the ship’s plate undergoes minor plastic deformation. Considering that the structure still has a high structural strength with a minor permanent deformation, developing a structural plastic design method for polar ships has become a hot research issue in current studies. Therefore, in this paper, based on the rigid-plastic theory and the ice-crushing-energy approach, an experimentally verified theoretical model for predicting plastic deformations of the vertical-side plate of polar ship subjected to ice floe impacts was established. According to the analytical solutions of the plastic deformation, the plastic design formula to determine the plating thickness of ice-strengthened ships subjected to ice floe impacts was further derived based on the plastic design criteria. In addition, the parameter analysis of ice strength described by the ice pressure–area relationship, allowable-permanent-set parameter, impact energy and ice shape were conducted, and plating-thickness design curves with different design parameters were given. The design of plating thickness is very sensitive to the determinations of the allowable-permanent set and ice pressure–area curves. The designed plating thickness decreased with the increase of the allowable-permanent set. Moreover, a comparative analysis of the designed plating thickness for ice floe impact and rigid-mass impact was also carried out. Under the same impact conditions, due to energy absorption caused by ice damage, the designed thickness of the plate for rigid-mass impact was much larger than that for the ice impact. It is necessary to consider the impact-induced ice damage and energy dissipation in a structural design, instead of using rigid impact loads for conservative design. The research in this paper can provide some useful references for the structural design of ice-strengthened ships subject to ice floe impacts.

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“…Substituting Equation (38) into Equation (37), the relationship between the crushing length of ice floe and the ice loss velocity parameters V i is obtained…”

Section: Design Formula For Plating Thickness Under Ice-impact Loadmentioning

confidence: 99%

A New Plastic Design Approach for the Vertical-Side-Plating Thickness of Ice-Strengthened Ships Suffering from Ice Floe Impacts

Mu,

Guo,

Cai

et al. 2024

JMSE

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show abstract

“…These manual assignments of high and low strength zones in studies such as references [66,74,[78][79][80] based on the CF plasticity model, to replicate the ice-crushing test results, suggest that the CF plasticity model cannot capture some of the important ice physics during the crushing process. This potential issue was systematically investigated by Mokhtari et al [65].…”

Section: Plasticitymentioning

confidence: 99%

“…This is because metallic foams show negligible deformation in directions orthogonal to the loading. However, this characteristic is inconsistent with the behaviour of ice under Kim et al [78][79][80] also utilised the CF material model, adopting a similar artificial modelling technique to that of Gagnon [66,74]. However, rather than dividing the ice domain into multiple layers, with each layer having both high-and low-strength properties, they partitioned the ice geometry into two distinct domains.…”

Section: Plasticitymentioning

confidence: 99%

“…The first case lacked physical confining walls, allowing lateral expansion of the element under axial loading. In contrast, the second case included fixed walls around the vertical sides of the These manual assignments of high and low strength zones in studies such as references [66,74,[78][79][80] based on the CF plasticity model, to replicate the ice-crushing test results, suggest that the CF plasticity model cannot capture some of the important ice physics during the crushing process. This potential issue was systematically investigated by Mokhtari et al [65].…”

Section: Plasticitymentioning

confidence: 99%

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A Critical Review of Constitutive Models Applied to Ice-Crushing Simulations

Mokhtari,

Leira

2024

JMSE

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In marine engineering, understanding the compressive behaviour of ice is crucial for accurately modelling ice loads on ships and offshore structures in ice-prone waters. Over the past few decades, numerous studies have focused on numerically simulating the ice-crushing process using various material models. A significant source of contention among these models lies in the representation of ice strength envelopes and their evolution with pressure and strain rate. Moreover, there is ongoing debate regarding whether plasticity or viscoelasticity more effectively captures the rheology of ice. Additionally, various flow rules have been implemented in plasticity models and different damage models have been used in viscoelasticity models, all of which play a critical role in simulating ice loads. This critical review aims to shed light on the reasons behind these disagreements and to evaluate the advantages and limitations of the most commonly used models, based on established theories in ice mechanics and empirical evidence.

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“…As the collision continues, spalling occurs with diminishing strain, facilitating the emergence of both high-pressure and low-pressure zones (HPZ and LPZ, respectively). It is noteworthy that research on HPZs in ice-crushing scenarios has been conducted by Kim and Daily [43], Kim et al [44], and Kim and Quinton [45]. These studies found that the observation of HPZs leads to a decline in impact force, attributed primarily to spalling.…”

Section: Fracture Patterns and Pressure Distribution In The Ice Speci...mentioning

confidence: 99%

Experimental Evaluation and Validation of Pressure Distributions in Ice–Structure Collisions Using a Pendulum Apparatus

Jang,

Hwang,

Lee

2023

JMSE

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This study introduced an experimental setup designed to predict collision pressure exerted on a structure due to ice impacts. The primary aim was to forecast the pressure distribution and structural behavior following an ice collision on a laboratory scale. The apparatus comprises a double-pendulum system situated within a cold chamber, facilitating the prediction of collision forces by varying both the collision energy and velocity. Experiments were conducted at collision velocities of 5, 7, and 10 knots, representative of conditions in Arctic regions. By altering these velocities, we measured both the strain experienced by a steel plate and the pressure due to the ice collision. The pressure distribution on the steel plate surface was also recorded by using pressure-sensitive film. This setup effectively captured the pressure distribution across the collision contact area. The measured pressure and force were compared with that of previous studies to determine the validity of the ice collision force measurement. This methodology successfully captures the relationship between the increasing collision speed and force, providing valuable insights into ice-induced forces and structural strain. It offers an effective measurement technique beneficial for designing ice-resistant structures. In conclusion, this paper enhances our understanding of ice–structure interactions, particularly in the domains of collision force and strain metrics.

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Evaluation of moving ice loads on an elastic plate

Cited by 12 publications

References 8 publications

A New Plastic Design Approach for the Vertical-Side-Plating Thickness of Ice-Strengthened Ships Suffering from Ice Floe Impacts

A New Plastic Design Approach for the Vertical-Side-Plating Thickness of Ice-Strengthened Ships Suffering from Ice Floe Impacts

A Critical Review of Constitutive Models Applied to Ice-Crushing Simulations

Experimental Evaluation and Validation of Pressure Distributions in Ice–Structure Collisions Using a Pendulum Apparatus

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