陶磁器用粘土練土の圧縮変形

抄録

A uniaxial compression test was carried out to investigate deformation behavior of clay green body for wet-pressing. Green bodies containing 25-35 mass% water were prepared from Hara gairome clay and distilled water. The samples were formed into column having various dimensions (20mmφ×30mmh, 20mmφ×15mmh, 20mmφ×10mmh, 33mmφ×10mmh) and were largely deformed by compression under a compression rate of 1.0mm·s^-1. When the stress-strain curves were converted to the stress-diameter/height curves according to the plastic deformation theory, the yield points and the linear relationships between stress and diameter/height were observed, which were well represented by a plastic deformation equation of uniaxial compression under full-surface-sticking, since the ratio of the slope of the line over the yield point were close to 0.19. The yield points increased with decreasing water content. The sticking was due to the adhesion between the steel die and the samples. In conclusion, it is found that the compression deformation of clay green body can be well characterized by using a uniaxial compression test.