Research On The Transfer Properties In The Solid Granule Medium Forming Based On The Slip-line Method And Meshless Method

Solid granules medium forming technology(SGMF) adopts solid granules medium instead of rigid punch(or liquid, elastomer) to achieve the metal forming in the realization of the process of pipe or sheet. The solid particle medium is the biggest characteristic of this process, and the basic work of the process is to study the mechanical properties of solid particles under high pressure.According to the problems of the finite element method in the study of solid granule medium stress flow, the slip-line theory is applied to study the pressure transfer performance of solid particles in this paper. Based on the solid particle medium pressure performance test, the solid granules medium passive pressure model is established. According to the performance test of solid particle medium material, the appropriate material parameters are selected, and the transmission performance of solid particle medium is analyzed by using the theory of axial symmetrical slip-line. The comparison of theoretical calculation results with the test results shows that the theoretical calculation with the experimental measurement of the pressure transfer law is basically the same, and it can be concluded that the slip-line method is feasible to analyze the performance of solid particles in the medium. Through of the theory of axial symmetrical slip-line, it can be more convenient to predict the pressure transfer of solid particles under different conditions, and to study the influence of friction force on the transmission properties of granular medium.According to the problems of the finite element method in the study of solid granule medium stress flow, the theory of meshless method is applied to study the solid particle medium in this paper. Based on the solid granules medium material properties of the test, the material parameters of appropriate numerical models of solid particles are selected. Through the expansion of rock and soil mechanics Drucker-Prager linear model, the numerical model of SPH method is established under different conditions. Using ABAQUS/explicit analysis calculation to compare the simulation results with the test results shows that SPH method analysis of solid granules medium pressure transmission performance is feasible.By changing the number of particles in the numerical model of the SPH method, and the type of kernel function, the influence of particle number and kernel function type on the simulation results of meshless method was studied. By comparing the simulation results with different internal friction angles, the influence of the internal friction angle of solid particles on the simulation results of the meshless method can be explored. Through the SPH simulation results, it can be seen that the particle number, the type of kernel function and the internal friction angle have important influence on the simulation.By using the slip-line theory and the meshless method, it is proved that the meshless method and the slip line theory is feasible, and it provides a new research method for the forming process of solid particles.