Miniature Gauges for Soil, Grains and Powders

概要

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The authers developed miniature gauges for soil, grains and powders mentioned below:(a) Pressure cell: measuring the normal stress between grains and wall. (b) Friction cell: measuring the tangential stress between grains and wall. (c) Internal stress cell: measuring the magnitude and direction of principal stress in grains. (d) Gradient cell: measuring the angle of revolution in grains. (e) Strain cell: measuring the strain in grains. In these gages, (a)~(d) are made up of electrical strain gauges, and (e) is made up of electrical coil. Then, using these gauges, the experiment of compression of sand in a cylinder was carried out. In this experiment, the accuracy of gauges was confirmed. And the distributions of resultant stress of wall, and internal stress and strain in sand were revealed.
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