Thermal Mechanical Analysis by Using Rigid Visco Plastic Meshless Galerkin Method Based on Delaunay Grid Integration for Metal for Ming Process

摘要

The consideration of the temperature effects on the material properties is of great importance for deformation processes in the warm and hot forming regime.A rigid visco-plastic meshless Galerkin method based on Delaunay grid integration is developed.The stiffness equations and solution formulas for thermal mechanical analysis are derived.The transformation method is adopted to impose essential boundary condition.The fixed cell quadrature method,which is independents of the integration domain,often cause a deterioration in accuracy for metal forming process analysis with curved and angled boundaries for integration accuracy recision loss.The Delaunay grid is used during computing the stiffness matrix and force vector.An isothermal plane strain forging process and a non-isothermal forward extrusion process are analyzed.In comparison with the results obtained by using software Deform-2D,the effectiveness of the method developed in this paper is demonstrated.