Influence Of Polar Ice Material Constitutive Model On Ship And Ice Interaction

With the rapid development of the world economy,energy shortages have become the most concerned issue among governments of all countries.With the global warming,the accelerated melting of ice in the Arctic,technological advancement and increasing attention from countries,the development of Arctic resources and waterways is attracting attention of the worldwide.Because of its short range,few countries in transit,few conflicts and hidden dangers in piracy that the Arctic route has a great potential to replace traditional navigation routes and the complete opening of the Arctic route in the future will directly change the global shipping pattern.However,because of global warming that the ice floes in Arctic waters are larger and thicker than other places.In the event of ship-ice collision,it will have a great impact on the environment and the safety of life and property.Therefore,research on polar ice collision has become a hot and difficult issue for scholars of various countries.In this paper,by using ship ice collision simulation,the polar navigation ship and sea ice properties are studied.The main work is as follows:(1)The physical and mechanical properties of ice are known by consulting existing literature both at domestic and abroad.By quoting sea ice constitutive models studied by other scholars,collision simulation of circular ice with rigid walls is performed.Compare the finite element results with ISO theoretical curves and experimental values to verify the accuracy of the sea ice constitutive model.(2)The collision between the ice and bow of different shell thickness was simulated.Compare the effects of external board damage.Ordinary bows have a severe loss effect during the collision.With the increase in the thickness of the outer panel,the damage and effect of the bow is gradually reduced until it is no longer damaged.It can be concluded that after the ship is strengthened,the impact resistance can be improved in the ice voyage.(3)In this paper,viscoplastic model and elasto-plastic model are selected for comparative analysis.Different constitutive models have different damage deformation degrees to the bow during the collision process,and there is also a certain difference between the damage effects of sea ice.In the continuous viscous model,the damage to the bow’s outer plate and the first column is continuous.After the collision,due to its own fragmentation that sea ice suffered serious damage and failure,and no collisions occurred in the later period.It is concluded that the viscoplastic sea ice constitutive model in ship ice collision is more effective in the simulation.(4)After analyzing the different constitutive models,the viscoplastic model was selected to continue the research.The simulation of the change in density and elastic modulus in the model was performed.When the sea ice density increases,it can be concluded that the hardening of sea ice occurs and the stiffness is strengthened.When the sea ice elastic modulus increases gradually,It can be concluded that the hardening of sea ice occurs,which leads to the increase of stiffness.After increasing both the density and elastic modulus,it is concluded that the strength of sea ice increases,and the damage to the bow is more serious.It can be concluded that the changes in density and elastic modulus have a certain influence on the strength of sea ice constitutive model.