Effect of Friction on Multi-axial Compression Process
The effects of friction on compression load,effective strain and damage value were analyzed by the method of rigid-plastic finite element during multi-axial compression.The results show that the maximum compression load increases gradually with the increase of the number of compression.The effective strain distributes in the form of ringwise,the maximum lies in the center and the minimum at the surface.The damage is inclined to appear at the drum shape perpendicular to the longest axis.With the increase of friction coefficient,the maximum compression load,strain inhomogeneity and damage value increase at the same number of compressions.The results indicate that friction is adverse for multi-axial compressions.We should shoose the appropriate lubricating steps must be adopted to decrease the effect of friction force.