All issues
Volume 20, Issue 2
Displaying 1-7 of 7 articles from this issue
- |<
- <
- 1
- >
- >|
-
Yasuo YAMADA1983 Volume 20 Issue 2 Pages 59-62
Published: February 10, 1983
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSWhen a glass bead put between parallel two plates is compressed, the contact area internal stress increases. In such a case, the stress state was simulated by the Finite Element Method, and the fracture condition was applied. As a result, the tensile stress occurred in the direction rectangular to the compressive stress in the inner part. The glass bead was fractured in the central section parallel to the compressive direction. Also it was shown that the tensile strength of the glass bead is represented by the following equation:
σt=1.1Pc/A
where, Pc is the fracture load, and A is the cross-sectional area of the glass bead.View full abstractDownload PDF (412K) -
Jun-ichiro TSUBAKI, Keiichi KATO, Genji JIMBO1983 Volume 20 Issue 2 Pages 63-68
Published: February 10, 1983
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe 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.View full abstractDownload PDF (671K) -
Hiromu ENDOH, Hiroshi TAKAHASHI, Kenji YAMAGUCHI, Kazuo ENDOH1983 Volume 20 Issue 2 Pages 68-73
Published: February 10, 1983
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThis paper is concerned with the power required to crush wood and bark, as well as with the size distribution and volume of the crushed particle.
The crushers used were of the hammer, grinder, and blade types.
The sphere equivalant diameter, dv, determined by the volume of the particle, was set as the size index for the particles crushed by the hammer and grinder-type crushers. The specific surface area Sw, was chosen as the size index for the particles crushed by the blade-type crusher. The power requirement followed Kick's law for the hammer and grinder type crushers where dv was used as the variable, and Rittinger's law was used for the blade-type one where Sw, was used as the variable.View full abstractDownload PDF (2626K) -
Kazutaka MAKINO, Mitsunori MATSUDA1983 Volume 20 Issue 2 Pages 74-82
Published: February 10, 1983
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe particle orientation of rod-like particle system is one of the most fundamental and urgent problems to be elucidated. This paper discusses the characteristics of the particle orientation of a two dimensional rod-like particle, as identified by computer simulation. As a result of it, the following conclusions are obtained.
1) The degree of particle orientation increases with the decrease in the porosity of the particle system but is constant over a specified porosity.
2) The degree of particle orientation changes more or less, periodically, in a direction perpendicular to the wall.
3) An estimation equation for the particle orientation can be obtained and its validity is checked.View full abstractDownload PDF (1019K) -
Kazuo SUZUKI, Yoshitaka KUWAHARA, Masao MIZUNO1983 Volume 20 Issue 2 Pages 82-85
Published: February 10, 1983
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSCeramic raw material (silicon nitride powder; 90%-α-Si3N4) was ground by a vibration ball-mill, of which a pot and balls were made of alumina. In the case of wet grinding in ethyl alcohol (C2H5OH), the wear of the pot and the balls was large but it was not so great in dry and wet grinding in trichlorotrifluoroethane (CFCl2CF2Cl). It was recognized that the particle size distribution of the product ground for 200 (300) hours became smaller and that the specific surface area was increased from 4.5m2/g for the as-received material to 10m2/g. Finally, the structual lattice irregularity was examined using the X-ray diffraction method.View full abstractDownload PDF (485K) -
Susumu TOHNO, Kanji TAKAHASHI1983 Volume 20 Issue 2 Pages 86-94
Published: February 10, 1983
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (1230K) -
Kazumi DANJO1983 Volume 20 Issue 2 Pages 99-101
Published: February 10, 1983
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (2227K)
- |<
- <
- 1
- >
- >|