Journal of the Society of Powder Technology, Japan
Online ISSN : 1883-7239
Print ISSN : 0386-6157
ISSN-L : 0386-6157
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Volume 15, Issue 10
Displaying 1-3 of 3 articles from this issue
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  • A Proper Method for Measuring Internal Friction Factors of Powder by Direct Shear Test
    Keijiro TERASHITA, Kei MIYANAMI, Takeo YANO, Yoshiyuki YAMAMOTO
    1978 Volume 15 Issue 10 Pages 583-593
    Published: October 10, 1978
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.15.583
    JOURNAL FREE ACCESS
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    Interrelations among shearing stress, applied normal stress (external load), actual normal stress at shearing plane, normal strain (powder bed expansion or contraction) and shearing strain have been extensively investigated for a number of powders under various test conditions such as the method of preconsolidation, by utilizing a shear tester (circular shearing cell) capable of measuring the actual normal stresses in the vicinity of shearing plane (3 points), the shearing stress and the normal strain simultaneously.
    It has been concluded that; if the internel friction factor having a universal validity and fairly independent of the test conditions is to be determined, it is essential to measure the actual normal stresses so that a uniformity of the stress distributionand an equality of the mean actual normal stress to the applied stress can be assured, or it is indispensable otherwise to measure at least the normal strain along with the shearing strain and to make sure that the normal strain is being kept as small as possible during a course of shearing.
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  • The Placement of Inserts to Break Arching in Hoppers
    Hiroshi TSUNAKAWA, Ryuichi AOKI, Kenji KOJIMA, Kohki MATSUSHIMA
    1978 Volume 15 Issue 10 Pages 594-601
    Published: October 10, 1978
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.15.594
    JOURNAL FREE ACCESS
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    A conical insert to avoid stable arch formation is placed in a conical hopper for storing a cohesive powder. The insert in the hopper forms an annular ring-shaped converging channel, in which stresses exerted by powders are analysed. Methods are given for determination of the annular ring-shaped opening and the hopper outlet, and an equation of estimating the vertical force on inserts is also described, comparing favourably with observations. The placement of inserts leads to a decrease of the minimum outlet diameter of hoppers through which powders flow under gravity.
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  • [title in Japanese]
    Naoyuki Nameishi, Yoichi Yokoyama
    1978 Volume 15 Issue 10 Pages 602-618
    Published: October 10, 1978
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.15.602
    JOURNAL FREE ACCESS
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