D. Bonnenfant et al., COMPACTION OF POWDERS CONTAINING HARD INCLUSIONS - EXPERIMENTS AND MICROMECHANICAL MODELING, Mechanics of materials, 29(2), 1998, pp. 93-109
The effect of reinforcements in powders during hot compaction is studi
ed with the help of model materials. The matrix is a polymethylmethacr
ylate (PMMA), which exhibits a nonlinear viscoplastic behavior at 110
degrees C. The inclusions are spheres of glass with different sizes. T
he samples an compacted in a triaxial cell. In situ measurements of de
nsity variations are made with an X-ray tomograph which allows, in add
ition, continuous measuring of the diameter of the samples. Different
volume fractions and sizes of inclusions are considered. The experimen
ts are modeled by means of a micromechanical procedure based on recent
ly proposed nonlinear variational procedures. An original multi-scale
scheme is proposed to account for the relative size of the inclusions
compared to the particles of matrix. (C) 1998 Elsevier Science Ltd. Al
l rights reserved.