Numerical Simulation Of Blasting Fragment Impact Cylindrical Storage Tank Based On LS-DYNA

With the rapid development of China's chemical park construction,the scale of the park has been continuously expanded,and the safety issues have become increasingly severe.Due to the characteristics of flammable and explosive medium in the park and centralized storage,once the equipment has an explosion accident,the projectile fragments generated by the explosion can easily form a collision with peripheral equipment and cause a domino effect accident,which has more serious consequences.To this end,based on the ANSYS/LS-DYNA program,the numerical simulation of the dynamic response of cylindrical tanks under the impact of cubic projectile fragments is carried out.Provide reference for projects such as construction and risk assessment of chemical parks.The main research contents and conclusions are as follows:(1)The dynamic response law of the explosive fragments impacting the cylindrical storage tank was studied.The characteristic parameters of the tank(internal pressure and volume)and the characteristic parameters of the fragments(contact area of the fragments and the tank,initial velocity,material and quality)were analyzed.The effect of factors on the impact response.The simulation results show that the internal pressure of the tank has the ability to resist the impact deformation of the projectile fragments,and the internal pressure of 1.2 MPa reduces the maximum deformation of the tank by 10%.For fragments of the same mass,the smaller the contact area when striking the tank,the greater the deformation of the tank due to impact.When the fragments velocity is 100m/s~300m/s,the impact deformation of the tank increases linearly with the increase of the initial velocity of the fragments.For the same volume of fragments,lead brass has a higher density,and the tank impact deformation is greater than that produced by Q345 R.The greater the mass of the projectile fragments,the greater the maximum deformation caused by the impact on the tank,and the position of the maximum deformation is located at the contact position of the shot fragments with the tank;in addition,the volume of the tank has a certain influence on its impact deformation.The larger the volume of the tank,the greater the deformation caused by the impact.The contact collision of the fragments with the cylindrical tank is a process of multiple contact collisions and eventually stabilization.(2)The dynamic response of the fragments impacting and penetrating the wall of the cylindrical tank was studied.The influence of the main factors such as the internal pressure of the tank,the initial velocity of the fragments,the contact area and the wall thickness of the tank on the penetration energy when penetrating the storage tank was analyzed.The results are as follows: the internal pressure of the tank has no obvious influence on the penetrating energy;the larger the initial velocity of the projectile fragments,the smaller the velocity loss of the fragments penetrating the storage tank,and the larger penetration residual velocity is likely to cause secondary impact penetration.In addition,the greater the contact area between the projectile fragments and the cylindrical tank,the higher the penetration energy required for the fragments to penetrate the tank,the lower the residual speed after the fragments penetrates the tank,and the threat of fragments to the tank.The smaller it is.The penetration energy of the fragments penetrating the cylindrical tank is linear with the thickness of the tank wall.The larger the wall thickness of the tank,the higher the penetration energy required for the fragments to penetrate the tank.