Simulating Ice-Sloping Structure Interactions With the Cohesive Element Method

Lü, Wenjun; Lubbad, Raed; Løset, Sveinung

doi:10.1115/1.4026959

Cited by 63 publications

(35 citation statements)

References 28 publications

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“…The mesh size influences both the maximum load and the load frequency greatly. This finding is similar to those in Wang et al and Lu et al for simulating ice-sloping structure interactions [17,18]. It is also found that the mean, standard deviation, and maximum values derived from the simulated ice forces increase with increasing failure strain.…”

Section: Discussionsupporting

confidence: 90%

“…The simulated crushing forces agreed well with the experimental results. Lu et al and Wang et al carried out numerical simulations of interactions between level ice and sloping structure using the cohesive element method [17,18]. Zhou et al proposed a numerical model to simulate the non-simultaneous crushing force acting on the cylindrical structures of wind turbines [19].…”

Section: Introductionmentioning

confidence: 99%

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Numerical Study of the Interaction between Level Ice and Wind Turbine Tower for Estimation of Ice Crushing Loads on Structure

Song

Ren

Zhou

2019

JMSE

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In this paper, the interaction between level ice and wind turbine tower is simulated by the explicit nonlinear code LS-DYNA. The isotropic elasto-plastic material model is used for the level ice, in which ice crushing failure is considered. The effects of ice mesh size and ice failure strain on ice forces are investigated. The results indicate that these parameters have a significant effect on the ice crushing loads. To validate and benchmark the numerical simulations, experimental data on level ice-wind turbine tower interactions are used. First, the failure strains of the ice models with different mesh sizes are calibrated using the measured maximum ice force from one test. Next, the calibrated ice models with different mesh sizes are applied for other tests, and the simulated results are compared to corresponding model test data. The effects of the impact speed and the size of wind turbine tower on the comparison between the simulated and measured results are studied. The comparison results show that the numerical simulations can capture the trend of the ice loads with the impact speed and the size of wind turbine tower. When a mesh size of ice model is 1.5 times the ice thickness, the simulations can give more accurate estimations in terms of maximum ice loads for all tests, i.e., good agreement between the simulated and measured results is achieved.

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Section: Discussionsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Numerical Study of the Interaction between Level Ice and Wind Turbine Tower for Estimation of Ice Crushing Loads on Structure

Song

Ren

Zhou

2019

JMSE

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“…CZM was applied to analyzing the behavior of ice by Mulmule and Dempsey [17,18]. Afterwards, some other researchers [19][20][21][22][23] applied CEM to simulate the interactions between level ice and marine structures.…”

Section: Cohesive Element Methodsmentioning

confidence: 99%

Study of Continuous Icebreaking Process With Cohesive Element Method

Wang¹,

Zhou²,

Zou³

et al. 2019

brod

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Accurate simulation of the continuous icebreaking process in level ice is crucial for the design of icebreakers. The crushing and bending failures of ice sheet, as well as the rotating, sliding and accumulating of ice cusps broken from the ice sheet constitute a complex system for the icebreaking process. In this paper, cohesive element method is combined with an elastoplastic softening constitutive model to simulate continuous icebreaking process in level ice. Firstly, the elastoplastic softening constitutive model in modelling ice local crushing is calibrated by simulating the ice cone crushing tests. Three different softening laws are proposed and their effects on simulation results are evaluated by comparing with the experimental data. Then, the continuous icebreaking process in level ice is simulated by cohesive element method. The regular tri-prism mesh is applied to ice bulk elements to realize the random propagation of crack. The mesh dependency study is carried out, and the simulation results are validated by comparing with model test results in both of time domain and frequency domain. The ice failure patterns during continuous icebreaking process are also compared between the simulated and experimental results. Finally, the influences of ship velocity on ice resistance and ice failure patterns are investigated by numerical methods and semi-empirical formulas.

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“…CZM was firstly proposed by Hillerborg et al [21] to model the local crack propagation of an unreinforced concrete beam. Due to the good performance of CEM in modeling the initiation and propagation of crack, many researchers have introduced CEM into ice mechanics to simulate the fracture of ice material [22,23,24,25].…”

Section: Numerical Modelsmentioning

confidence: 99%

Numerical Simulation of Ice Milling Loads on Propeller Blade With Cohesive Element Method

Wang

Zou

Zhou

et al. 2019

brod

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In ice-infested waters, propellers of a polar ship are likely to be exposed to ice loads in different scenarios. Propeller milling with ice is one of the most dangerous cases for icepropeller interaction. In this study, we try to simulate dynamic milling process of icepropeller and reproduce resulting physical phenomena. Cohesive element method is used to model ice in the simulation. To simulate material properties of ice, an elastoplastic softening constitutive law is developed. Both crushing and fracture failures are included in the icepropeller 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 propeller rotation speed, advance velocity and cutting depth on ice block, the sensitivity study has been carried out. The results show that dominant ice loads are affected much by the three parameters. It is shown that decreasing rotation speed, or increasing advance velocity and cutting depth may lead to higher ice loads. Care should be taken to avoid overloading on propeller when operating in ice for polar ship.

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Simulating Ice-Sloping Structure Interactions With the Cohesive Element Method

Cited by 63 publications

References 28 publications

Numerical Study of the Interaction between Level Ice and Wind Turbine Tower for Estimation of Ice Crushing Loads on Structure

Numerical Study of the Interaction between Level Ice and Wind Turbine Tower for Estimation of Ice Crushing Loads on Structure

Study of Continuous Icebreaking Process With Cohesive Element Method

Numerical Simulation of Ice Milling Loads on Propeller Blade With Cohesive Element Method

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