A three-dimensional microscopic model of powder compacts for viscoplastic finite element analysis is developed to investigate the deformation behavior of powder particles during sintering. The unit cells containing three types of pore: a spherical closed pore, a spherical open pore and an open pore surrounded by eight spherical particles, are analyzed. Pore shrinkage due to surface tension during the intermediate stage of sintering is simulated. The volumetric strain rate for each of the unit cell is compared with that of a spherical pore surrounded by a spherical shell and the effect of the pore shape on the sintering rate is discussed. Sintering rate is expressed as a function of relative density, viscosity and sintering stress. The expression for the shrinkage rate gives a good fit to the results obtained by finite element analysis.
|Number of pages||6|
|Journal||Nippon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A|
|Publication status||Published - Jan 1 1996|
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Mechanics of Materials
- Mechanical Engineering