A LINEARLY CONFORMING POINT INTERPOLATION METHOD (LC-PIM) FOR PERFECT VISCO-ELASTOPLASTIC ANALYSIS OF 2D SOLIDS

Abstract

A linearly conforming point interpolation method (LC-PIM) was recently proposed for  the  solid  mechanics  problems.  In  this  paper,  the  LC-PIM  is  further  extended  to perfect visco-elastoplastic analyses of 2D solids. A dual formulation for the LC-PIM with displacements and stresses as the main variables is performed. The von-Mises yield function and the Prandtl-Reuss flow rule are used. In the numerical procedure, however, the stress variables are eliminated and the problem becomes only displacementdependent. The numerical results show that the LC-PIM is much more accurate than the FEM and possesses the upper bound property which is very meaningful for the viscoelastoplastic analyses which almost have not got the analytical solutions. This suggests that we can use two models, LC-PIM and FEM, to bound the solution, and can even estimate the global relative error of numerical solutions.