A new method based on the micromechanics of powder particle deformation for evaluating the yield function parameters is attempted. 2D particles in close packed arrangements with two different starting relative densities are considered. These unit cells are studied under plane strain conditions for basic densification response using Large Strain elasto-plastic Finite Element Analysis. Macroscopic values of stresses and the relative densities are recorded for different loading paths. Within the basic form of Shima's yield function these material parameters are computed. The yield function parameters thus computed are found to be in good agreement with the experimental results reported on copper powder.
展开▼
