Experimental calibration of density-dependent modified Drucker-Prager/Cap model using an instrumented cubic die for powder compact

• Published in: Powder technology Vol. 204; no. 1; pp. 27 - 41
• Main Authors: Zhang, Baosheng, Jain, Mukesh, Zhao, Chenghao, Bruhis, Michael, Lawcock, Roger, Ly, Kevin
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 10.12.2010; Elsevier
• Subjects: Applied sciences; Calibration; Chemical engineering; Compressibility (powder); Computer simulation; Cubic die compaction; Density; Exact sciences and technology; Fittings; Material model calibration; Mathematical models; Metal powder compaction; Miscellaneous; Powder compacts; Solid-solid systems; Strain; Material model calibration; Metal powder compaction; Cubic die compaction; Instruments; Metal powder; Unloading; Compaction; Calibration; Density; Modeling; Design; Loading; Plastic material
• ISSN: 0032-5910; 1873-328X
• DOI: 10.1016/j.powtec.2010.07.003

Theory and experimental calibration of density dependent modified Drucker-Prager/Cap (DPC) model are presented by using a novel instrumented cubic die in powder compaction tests. The cubic die is designed for directly determining the loading and unloading forces and displacements of powder compact inside the die in compaction and transverse directions without any additional calibration. The cap surface parameters and elastic properties are characterized by fitting stress and strain curves recorded during loading and unloading at different green density values and the plastic material parameters for failure surface are obtained by additional radial and axial compressive tests. The experimental data is subsequently used in the simulation of cubic die compaction to verify the results from the density dependent modified DPC model. The cubic die is designed for directly determining the loading and unloading forces and displacements of powder compact inside the die in compaction and transverse directions without any additional calibration. The cap surface parameters and elastic properties are characterized by fitting stress and strain curves recorded during loading and unloading at different green density values. The experimental data is subsequently used in the simulation of cubic die compaction to verify the results from the density dependent modified DPC model. [Display omitted]