Numerical simulation of residual stress field in green power metallurgy compacts by modified Drucker–Prager Cap model
- Resource Type
- Authors
- Lianhong Zhang; Bai-yan He; Rui Zhou; Yuhong Liu
- Source
- Transactions of Nonferrous Metals Society of China. 23:2374-2382
- Subject
- Diffraction
Engineering
Computer simulation
business.industry
Metals and Alloys
Compaction
Structural engineering
Geotechnical Engineering and Engineering Geology
Condensed Matter Physics
Finite element method
Drucker–Prager yield criterion
Residual stress
Materials Chemistry
Relative density
Process simulation
Composite material
business
- Language
- ISSN
- 1003-6326
Compaction process simulation and residual stress prediction of green PM compact were carried out with elasto-plastic 3D FEA based on the modified Drucker–Prager Cap model in Abaqus. The model parameters of the investigated powder Distaloy AE were determined as functions of relative density through typical mechanical property tests of powder. The model was implemented as a user subroutine USDFLD. Single sided compaction of a d 20 mm×5 mm disk green compact of Distaloy AE was simulated, and the residual stress of the disk after ejection was predicted with FEA. The FEA results of the compaction process and the residual stress of the disk show good agreement with compaction experiments and X-ray diffraction measurements, which validates the model and its parameters. The results indicate that the compressive residual stresses exist mainly in a thin layer on the side surface, but the residual stresses are very small on the top and bottom surfaces.