A Finite Element Analysis for Near-net-shape Forming of Aluminum Alloy Powder Under Warm Pressing

摘要

A finite element analysis for near-net-shape forming of aluminum alloy powder was performed under warm rubber isostatic pressing and warm die pressing. The advantages of warm compaction by rubber isostatic pressing were discussed to obtain a part with better density distributions. The shape of rubber mold was designed by determining a cavity shape that provides a desired shape of the final powder compact. To simulate densification and deformed shape of a powder compact during warm pressing, the elastoplastic constitutive equation based on yield function of Shima-Oyane was implemented into a finite element program (ABAQUS). The hyperelastic constitutive equation based on the Ogden strain energy potential was employed to analyze nonlinear elastic response of rubber. Finite element results were compared with experimental data for aluminum alloy powder compacts under warm die pressing and warm isostatic pressing.