Models for predicting frictional properties of rapeseed
Xue Chen 1,2
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Department of Food Science and Engineering, Nanjing University of Finance and Economics, Nanjing, China
Collaborative Innovation Centre for Modern Grain Circulation and Safety, Nanjing, China
Acceptance date: 2018-06-12
Publication date: 2019-02-13
Int. Agrophys. 2019, 33(1): 61-66
By using rapeseed as a model material, we deter- mined the internal friction angle and the friction coefficient against different surface types, by means of direct shear apparatus. We also established predictive models by fitting the experimental data. The internal friction angle of rapeseed ranged from 23.91±0.28 to 34.99±1.08°. It decreased with normal stress (25 to 100 kPa), and increased with the moisture content (6.58 to 11.16% wet basis). The friction coefficient against a surface of stainless steel, wood and concrete ranged from 0.25±0.01 to 0.50±0.03, 0.34±0.00 to 0.56±0.00, and 0.40±0.00 to 0.56±0.06, respectively. A decrease in the friction coefficient was observed with increased normal stress (25 to 100 kPa). The friction coefficient tended to increase when the moisture content grew from 6.58 to 11.16% (a wet basis). When it comes to comparing the values of the friction coefficients of different friction materials, stainless steel had the lowest friction, followed by wood and concrete. Models were developed based on the obtained data, and the simulated values agreed well with the experimental data. These models can quickly predict the internal friction angle and friction coefficient values.
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