The following hypothesis was proposed and checked; “The poured angle of repose is represented by arctan
y/x at the point (
x, y) on the cohesion parabola, consequently the trajectory of
y, the maximum height at
x (the radius of base plate), draws the cohesion parabola.”
The sets of data obtained by measurement of the poured angle method gave a much better fit with the cohesion parabola than fit with the straight line proposed by D. Train and R. Aoki.
One could determine separately the coefficient of interparticle friction and the cohesion of powders and fine granules by cohesion parabola analysis.
The comparison of the data obtained by the drained- and the poured method showed that the latter tended to give abnormal values for coarse samples, presumably because the inertia of dropping particles was not negligible.
Some discussions were given on the ratio of the coefficient of interparticle friction to the co-ordination number, and on the apparent coherency.
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