A Determining Method of Constitutive Parameters for Metal Powder Compaction Based on Modified Drucker-Prager Cap Model
ZHOU Rui1, LI Lulu2, XIE Dong2, ZHANG Jianguo2, WU Mengli1
1 School of Aeronautical Engineering, Civil Aviation University of China, Tianjin 300300; 2 School of Mechanical Engineering, Tianjin University of Science and Technology, Tianjin 300222
Abstract: Aiming to provide alleviations for the problems of the modified Drucker-Prager Cap model including complexity and low accuracy of the obtained parameters, a combinational constitutive parameter determining method that involves both simple expe-riment and inverse optimization was proposed and applied to numerical simulation of metal powder compaction. First, the important inverse optimization parameter called the cap eccentricity parameter R was determined by the experimental analysis and theoretical derivation. Then, the simulation method using ABAQUS finite element platform and MATLAB optimization algorithm was implemented for inverse optimization of parameter R and calculation of the related hardening parameters. The metal powder Distaloy AE was used to discuss the influence of the inverse results of different R on the numerical simulation of powder compaction process. The results showed that the cap eccentricity parameter R2 and its associated hardening parameters were more accurate than R1 for the numerical simulation of the pressing force, ejection force, relative density and residual stresses.
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2018, Vol. 32 
