A numerical model for ice crushing on concave surfaces

Kim, Hyunwook; Daley, Claude; Colbourne, Bruce

doi:10.1016/j.oceaneng.2015.07.020

Cited by 31 publications

(25 citation statements)

References 18 publications

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“…There are several numerical ice models used in the earlier studies (see Liu et al [32], Gagnon and Wang [26], DerradjiAouat et al [37] and Kim et al [38]), in which the unknown ice parameters are derived heuristically to obtain compliance with the experiments. However, fully phenomenological constitutive models of ice are rare, probably due to incomplete understanding of post-terminal ice failure mechanisms and a lack of suitable measurements.…”

Section: Discussionmentioning

confidence: 99%

A comparative analysis of the fluid-structure interaction method and the constant added mass method for ice-structure collisions

et al. 2016

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Section: Discussionmentioning

confidence: 99%

A comparative analysis of the fluid-structure interaction method and the constant added mass method for ice-structure collisions

et al. 2016

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show abstract

“…The gentle load drops appeared in the simulations are caused by the softening and failure of ice elements, which also can be observed in the experimental results. The abnormal large drops of experimental loads at the displacement of 9mm and 18mm are caused by start-stop discontinuity of the indenter motion, which was explained by Kim et al [27]. The mean values and standard deviations of calculated and measured impact forces are given by Table 2, in which the errors between the calculated and measure results are also provided.…”

Section: Numerical Calibration Of the Constitutive Modelmentioning

confidence: 93%

“…Because the stiffness of ice cone is greatly different from that of rigid plate, the contact algorithm between ice cone and rigid plate adopts command of CONTACT-ERODING-NODES-TO-SURFACE, and the friction coefficient between ice and rigid plate is set as 0.2. 5 gives the comparison between the numerical results and the experimental results from Kim et al [27] at different impact velocities. As shown in the figure, all of the load curves present "stepped" rising tendency due to the continuous impacting and local crushing between ice cone and rigid plate.…”

Section: Numerical Calibration Of the Constitutive Modelmentioning

confidence: 95%

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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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“…The propeller will rotate at a constant speed ω p = 2 rps anticlockwise, while the ice block will move towards the back of the blade along the negative direction of the x-axial. The blades were designed with reference to Stone Marine Meridian series [23][24][25]. There were ice-strengthened by increasing the thickness for navigation in ice.…”

Section: Numerical Modelmentioning

confidence: 99%

Simulation of Ice-Propeller Collision with Cohesive Element Method

Zhou

Wang

Diao

et al. 2019

JMSE

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The existence of ice in ice-covered waters may cause damage to the propeller of polar ships, especially when massive ice floes are submerged around the hull. This paper aims to simulate an interaction process of a direct ice collision with a propeller based on the cohesive element method. A constitutive law is applied to model the ice material. The model of ice material is validated against model test results. The resulting impact loads acting on the contact surfaces and the corresponding ice block velocity are calculated in the time domain. The ice crushing, shearing and fracture failures are reproduced in the simulation. The convergence study with three meshing sizes of ice block is performed. To carry out a parametric study, five parameters are selected for analysis. These parameters are composed of rotational speed, direction of the propeller, initial speed of the ice block, contact position, and area between the ice and the propeller. The results show that the ice loads are affected by the five factors significantly. Ice loads tend to increase by decreasing the rotational speed, increasing the initial ice speed and the contact area, and changing the rotational direction from clockwise to counterclockwise. The effect of the contact position on the impact loads is relatively complex, depending on rotational speeds of the propeller.

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A numerical model for ice crushing on concave surfaces

Cited by 31 publications

References 18 publications

A comparative analysis of the fluid-structure interaction method and the constant added mass method for ice-structure collisions

A comparative analysis of the fluid-structure interaction method and the constant added mass method for ice-structure collisions

Study of Continuous Icebreaking Process With Cohesive Element Method

Simulation of Ice-Propeller Collision with Cohesive Element Method

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