Simulation Research On Ice Loading Of Typical Floating Vertical Icebreaking

The vertical icebreaking of the structure such as floating body operating in ice area is an important scenario in the polar exploration and utilization engineering.The ice load experienced by the floating body during vertical icebreaking is a polar research focus.At present,the domestic research on the vertical icebreaking load of floating body is still immature,and there are still many research difficulties to be overcome whether it is physical test or numerical simulation.This paper focuses on the vertical icebreaking load of typical floating body,and the physical test of vertical icebreaking of typical floating body was explored.Based on the finite element method,numerical simulation was carried out for the problem of vertical icebreaking of typical floating body,which provides reference for the strength design,safety manipulation and icebreaking ability forecasting of floating bodies in ice area operations.Firstly,relying on the Small Ice Model Basin of China Ship Scientific Research Center(CSSRC SIMB),the columnar saline model ice was made to perform the circular plate center loading tests.The observation experiment of model ice crystal was carried out to obtain the crystal structure of the model ice and calculate the porosity of the model ice.The physical test of the vertical icebreaking of cylinder was carried out,the high-speed camera system was used to observe the destruction of the level ice in the vertical icebreaking process of the cylinder,and the ice load of the cylinder during the icebreaking process was obtained by the load cell.Secondly,the finite element method was used to simulate the model ice.Based on the failure mode and physical characteristics of the model ice,the material model of the model ice was chosen.Then,the Java language was chosen to model the internal porosity of the model ice by removing the elements.The failure phenomenon and force history curve of the simulation results were compared with the results of the model ice physical test to identify the numerical simulation parameters.According to the vertical icebreaking scenario of the floating body,a numerical model of cylindrical vertical icebreaking was established,and the accuracy of the numerical model was verified by comparing it with the results of the physical test.Finally,based on the numerical model of vertical icebreaking of cylinder,typical floating structures such as cylinder,cuboid,elliptical cylinder were chosen to carry out vertical icebreaking simulation experiments at different ice thicknesses and floating speeds.The force curve of the ice load was studied and the ice failure during the vertical icebreaking process of a typical floating body was observed.The calculation results under different working conditions were statistically analyzed,and the factors affecting the vertical icebreaking load of floating body were studied,to provide reference for vertical icebreaking operations and strength design of floating body.In general,this paper combined the circular plate center loading test,physical test,and numerical simulation to carry out the study of vertical icebreaking ice load of typical floating structures,and the research results can provide a useful technical reference for the strength design and safety manipulation of floating bodies in ice area operations.