Modeling Simulation And Experimental Research On Coupling Characteristics Of Mortar Plate And Soil

The mortar base is used to cushion the recoil force during launching and ensure good shooting stability of the mortar.There are many kinds of soils in the launch position,and the working conditions of the base plate are also extremely complicated.The combined force of the mortar is also very large.Therefore,the coupling properties between plate and soil is an important prerequisite for optimizing the structure of the base plate and reducing the mass of the base plate.Coupling characteristics between the base plate and soil under the dynamic impact are studied by using combination of experiment and finite element simulation analysis.The main research contents of the thesis are as follows:Firstly,an experimental scheme for the coupling characteristics of the mortar base and soil is designed including the design of impact load generating device,the selection of base plate and soil type,the design of tooling and building a test system.The dynamic parameters and their test locations reflecting coupling characteristics are determined.Impact on the base plate,strain on key positions and displacements of the base plate are tested,collected and processed.The dynamic properties between the base plate and soil under impact are obtained through the experimental test.Secondly,dynamic nonlinear finite element models are established of the experimental device under a smaller impact and the whole mortar during launching.Through dynamic finite element numerical simulation,the distribution law of impact,strain and displacement of the sill is obtained.Finally,the stresses and transfer laws of the base plate of mortar under different launching conditions are calculated,and the stress and displacement variation law of the base plate under impact load is analyzed.The correctness and rationality of the model and numerical simulation results is verified by comparing with the test results.The research results in this thesis have a theoretical and engineering value on structural optimal design of the mortar plate.