Study On The Finite Element Simulation Of Silo Side Pressure

The pressure by the storage in the warehouse is the main load of silo. In fact, many domestic scholars have been doing a lot of research for a long time about the calculation problem of storage pressure, and foreign research history is longer. So far, lateral pressure calculation is based on the Janssen formula in every country, but the lack of Janssen formula is only considering the storage of the stationary state. In fact in the process of storage of discharge, the status of the internal pressure is very complex. In the process of discharge the dynamic pressure to the warehouse wall is greater than the static pressure because of the flow of storage. So the silo damage or cracking is often produced in the process of discharging.It is usual that using the finite element method to analysis the static pressure of the storage. But using the finite element method simulation solving the dynamic pressure of the storage haven’t seen much. This article adopts the method of numerical to simulate the static and dynamic lateral pressure of the model silo, the main research contents and results are as follows:1. The finite element method is used for simulating the static and dynamic lateral pressure of the model silo, the simulation results will be compared with the results in our specification and Janssen formulas. The results show that the static simulation is very consistent with Janssen formula, so as to select the appropriate contact element type, mesh size, etc. In order to simulate the actual situation that the storage is in stress at the beginning of the discharge and the characteristics of nonlinear finite element method, we will develop dynamic computational scheme through the displacement constraint method and the method of automatic time steps. Then we establish the model silo which is the dynamic finite element model of the lateral pressure simulation. The dynamic lateral pressure in the process of unloading curve is obtained at various points along the wall of warehouse also we obtain the maximum lateral pressure. The results show that dynamic simulation is greater than the static simulation and the dynamic simulation is greater than the standard value. Excess pressure coefficient along the warehouse wall tends to regulate excess pressure coefficient.2. The control variable method is used to study the influence of different parameters for the warehouse wall lateral pressure and the normal pressure of the funnel, which include the cone Angle of the funnel, the width of conical funnel discharge outlet, the friction coefficient between the storage and warehouse wall and the angle of internal of storage. Excess pressure coefficient along the warehouse wall is obtained.3. By considering the influence of different parameters for the warehouse wall lateral pressure, the dynamic parameters of calculation model are optimized. In order to simulate the actual situation that the storage is in stress at the beginning of the discharge and the characteristics of nonlinear finite element method, the dynamic computational scheme through the displacement constraint method and the method of automatic time steps are given. Finally the finite element model of the silo is established. The excess pressure coefficient is worked out. By comparing with the relevant documents and specification, the lateral pressure and overpressure coefficient are more reasonable.