Research On The Collision Resistance Of The Honeycomb Buoyancy Tank Based On Different Materials

In recent years,more and more accidents have occurred,which has attracted the attention of experts and scholars at home and abroad.The anti-collision tank can effectively reduce the impact of the boat and protect the bridge pier.The form of buoyancy tank is varied,from the steel type floating box with the large elastic modulus to the newly emerging flexible buoyancy tank,it can be said that the development of the material is closely related to the anti-collision ability of the floating box.FRP material is a kind of material commonly used in flexible buoyancy tank.It has high light weight and low elastic modulus.At present,more and more domestic and foreign scholars have started to study the anti-collision materials of floating box.In this paper,the impact of different materials on the impact of different materials on the anti-collision of the honeycomb anti-ship collision tank is analyzed through the finite element numerical simulation,which is the engineering background of the FRP honeycomb anti-collision floating box of a bridge pier.The main contents of this paper are as follows:(1)Completing the bridge FRP honeycomb anti-collision pontoon material basic mechanical test(bending,stretching,compression,shear),its mechanical parameters such as elastic modulus,strength,and reference data for the back of the calculation.(2)Using MIDAS/Civil to check the bridge pier,and the critical resistance value can be obtained through trial calculation.Using the Hyper Mesh software to simulate the refined anti-ship collision model,the finite element simulation analysis is carried out.Collision avoidance in the project under the structure of pontoon,respectively on naked pier,GFRP and CFRP,working condition of steel pontoon three kinds of materials to the ship collision dynamics calculation,comparison get GFRP materials pontoon crashworthiness can better,to protect the bridge pier effect is better,less damage to the ship.(3)To further analyze the impact of single material parameters such as elastic modulus,density and plastic zone on the anti-collision ability of buoyancy tank.The anti-collision can be the best when the elastic modulus E=5GPa is obtained.The higher the elastic modulus,the higher the stiffness of the buoyancy tank,the better the reduction effect of the ship,but the damage to the ship will be increased,the energy dissipation will be reduced,the transmission effect will be obvious,and the ship collision force will increase.The lower the elastic modulus,the worse the deceleration buffer effect,the less energy consumption of the buoyancy tank and the increase of the collision force.Therefore,it is best to choose the suitable elastic modulus to prevent collision.The change density did not change the elastic modulus of the material to the impact of the impact tank,the change density has little effect on the impact resistance of the buoyancy tank.The smaller the plastic modulus Ep,the more the tank energy dissipates,the smaller the collision force,and the ship is basically non-deformed.Therefore,in the condition of ideal elastoplastic materials,the anti-collision ability of the floating box can be the best.And it's better than the buoyancy tank.The higher the plastic modulus,the higher the stiffness of the buoyancy tank,the better the reduction effect of the ship,the greater the damage to the ship,the decrease of the energy consumption,the obvious transmission effect,and the increase of the collision force.(4)Analyze the impact of damage intensity on the anti-collision energy of buoyancy tank.The overall damage strength of the buoyancy tank is higher or lower,and the impact force of the ship will increase,and the appropriate material damage strength can meet the minimum requirements of the collision force.In the same conditions of modulus of elasticity,change box shell component breakdown strength of the influence of the pontoon amplitude is bigger than change the breakdown strength of cylindrical shell components,the compressive strength of tank and tank shell components crashworthiness to the influence of the degree of influence is greater than the tensile strength.