抄録
The splitting mechanism of a powder bed is studied experimentally, by using a split cell type tensile strength tester which is able to measure stress and strain at the same time, Three kinds of Kanto loam powder(JIS standard powder), two kinds of limestone powder, and fused alumina powder, were used as samples. The particle diameters of the powder samples were several μm except for one of the Kanto loam powder samples. The sample powders were fed into the split cell by two feeding methods, through a sieve, and using two sieves in order to control the agglomeration size. From the relationship between the energy, the displacement required to split and the tensile strength, it was found that the compression of powder beds changes not only the strength of the powder beds but also the brittleness, and this change depends on the agglomerate condition in the powder beds. This change is also remarkable in powder beds consisting of little agglomerate particles or in weak cohesive powder.
