Abstract:

It needs to establish analysis models of machine parts (boundaries),when use DEM(Discrete Element Method) to analyze the contact action between machine parts and granular materials.There exist irregular surfaces which can not be expressed by the elementary analytic function in the parts’ surfaces which contact with granular materials.The AFT(Advancing Front Technique)  was used to mesh and discrete irregular surfaces into the triangle planar units,parameters of movement characters and material properties were added in the same time,so the DEM analysis models of irregular surfaces was created.Based on the redevelopment of PRO/E software,the boundary modeling software of irregular surfaces was developed.By application examples,the feasibility of boundary modeling method and the software which based on the AFT was validated,which lays foundations for simulation and analysis of working process for machine parts with complex structure.

Key words: discrete element method, boundary modeling, irregular surfaces, advancing front technique