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WALL FRICTION MEASUREMENT

 

Measurement of wall friction is similar to the measurement of shear stresses.

To measure the static friction, several repeating shear steps are required until the static friction reaches a maximum. The dynamic friction value follows the static friction peak. The friction is measured beginning with the lowest pressure and increasing for further steps.

It is important to simulate the roughness of the surface of the plate, because an incorrect roughness can lead large mistakes, such as the collapse of silos.

The test palette for measurement can be round or hexagonal.

wall friction sample

 

 

 

 

 

EXAMPLE EVALUATION OF WALL FRICTION RESULTS

 

file name WF1a.wf EVALUATION REPORT WALL FRICTION
date03 May 2016
material VA
operator MB
client SHEAR-TEST.com
device ST200AUTO
shear cellST30.cel
note 

linear approximation of static friction Τm(σ) = σ * μs + adhesions
φs 9.4 deg angle of static friction
Τs = 71 Pa adhesion of static friction
Rs = 0.999 coefficient of correlation static friction

linear approximation of dynamic friction Τs(σ) = σ * μd + adhesiond
φk = 8.7 deg angle of dynamic friction
Τk = 0 Pa adhesion of dynamic friction
Rk = 0.999 coefficient of correlation dynamic friction

 

Measurements and evaluations of physical properties of powders and bulk solids yield locus

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