Experimental device and method for obtaining granular material press power and die wall friction force

Abstract

The invention discloses an experimental device and method for obtaining granular material press power and die wall friction force, and belongs to the field of experimental mechanics. The experiment comprises an upper die punch, a lower die punch, a female die and a granular material pressing blank. A first pressure sensor is installed on the upper die punch. A second pressure sensor is installed on the lower die punch. The first pressure sensor and the second pressure sensor are connected with a recording instrument through a transmitter. The experimental method comprises the steps that when the granular material pressing blank is pressed, a pressure signal obtained by the first pressure sensor is upward F, a pressure signal obtained by the second pressure sensor is downward F, the transmitter converts the upward F and downward F pressure signals into standard signals of 4-20 mA and transmits the standard signals to the recording instrument, and the recording instrument records the upward F and the downward F in real time. The experimental device and method are used for calibrating a friction coefficient between a die wall and particles in a DEM method.

Description

technical field [0001] The invention relates to the field of experimental mechanics, in particular to an experimental device and an experimental method for obtaining the pressing force of granular materials and the frictional force of mold walls. Background technique [0002] When using the DEM (discrete element method, discrete element method) method to analyze and study the force of granular materials, it is necessary to calibrate the friction coefficient between the particles and the mold wall. For this purpose, the friction force between the particles and the mold wall must first be obtained. At present, most pressure testing machines or molding presses can only obtain a total pressure value, which accurately expresses the pressure on the particles on the upper surface of the mold, and cannot reflect the friction between the particles and the mold wall, nor can it Give the force situation of the bottom particles. Therefore, the calibration of the friction coefficient be...

AI Technical Summary

Problems solved by technology

At present, most pressure testing machines or molding presses can only obtain a total pressure value, which accurately expresses the pressure on the particles on the upper surface of the mold, and cannot reflect the friction between the particles and the mold wall, nor can it Give the force situation of the bottom particles

Therefore, the calibration of the friction coefficient between the particles and the mold wall cannot be achieved by using the current pressure test device

Images