Estimation of Yield Surface on Iron Powder Compaction for Finite Element Analysis using Drucker-Prager Cap Model

9th Thai Society of Mechanical Engineers, International Conference on Mechanical Engineering

Ogawa, R.^1 ; Yoshimura, T.^1 ; Yagi, N.^1 ; Mizuta, K.^1 ; Taniguchi, Y.^2

National Institute of Technology, Nara College, Nara

639-1080, Japan^1

Department of Mechanical Engineering, National Institute of Technology, Nara College, Nara

639-1080, Japan^2

关键词: Compaction pressure;    Critical stress;    Drucker-Prager Cap models;    Drucker-Prager yield surface;    Input parameter;    Instrumented die;    Powder compactions;    Yield characteristics;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/501/1/012021/pdf
DOI  :  10.1088/1757-899X/501/1/012021

来源: IOP

【 摘 要 】

Shear failure yield line in Drucker-Prager yield surface for conventional atomized iron powder has been estimated with critical stress state and uniaxial failure stress state by single shear test and uniaxial failure test for green compact. Lateral force measurement test was also conducted using newly devised instrumented die compaction system to identify compaction yield characteristics as Cap yield surface. By those estimations, materials input parameters for Drucker-Prager Cap model have been determined successfully. Finite element analysis of simple closed-die compaction has been conducted and good correspondence in variation of compaction pressure with densification has been recognized.