Dissertation
Dissertation > Industrial Technology > Light industry,handicrafts > Food Industry > Food processing industry > General issues > Basic science

Grain angle of internal friction , elastic modulus and modulus body experimental study

Author AnRongRong
Tutor ChengXuZuo
School Nanjing University of Finance and Economics
Course Agricultural Products Processing and Storage Engineering
Keywords Shear experiment Triaxial test Internal friction angle Modulus Body modulus
CLC TS210.1
Type Master's thesis
Year 2010
Downloads 78
Quotes 4
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This thesis heap of wheat, rice and corn heap heap angle of internal friction, elastic modulus heap of wheat and wheat pile modulus determination methods were studied, and they were determined and analyzed. Experimentally determined through direct shear heap of wheat, corn and rice heap heap angle of internal friction, moisture analysis, shear rate, normal stress three factors on the three types of internal friction angle grain effect. Experimentally determined using triaxial heap of wheat angle of internal friction, elastic modulus heap of wheat and wheat pile modulus, through the pre-analysis and comparison of experimental results to determine the elastic modulus of the heap of wheat was measured in several experimental conditions (stagnation Circle the number back, unloading interval, axial pressure), analyzed the confining pressure on the elastic modulus of the heap of wheat and analyzing the impact of the confining pressure, moisture wheat pile modulus effects. Experimental results show that the direct shear: Wheat heap (Nanjing production, water was 10.96%) and rice heap (Late Indica 521, water was 11.78%) were internal friction angle shear rate (0.53mm/min ~ 5.20mm/min ) increases and decreases, which varied from 17.49 ° ~ 25.01 °, 35.75 ° ~ 40.03 °; corn heap (Nanjing production, water was 11.05%) and rice heap (Nanjing production, water was 13.77%) within the both friction angle shear rate (1.33mm/min ~ 5.20mm/min) the increase of decrease the variation range of 22.21 ° ~ 28.93 °, 28.95 ° ~ 33.19 °. Shear rate on wheat heap (Nanjing production) and rice heap (Late Indica 521) angle of internal friction is not significant, according to the shear rate and corn heap (Nanjing production) and rice heap (Nanjing yield) of the relationship between the angle of internal friction, respectively, can be obtained by fitting equation: y =-0.2219x ~ 2 0.2123x 28.318, y =-0.0606x ~ 2-0.2532x 33.147, where x is the shear velocity, y is the angle of internal friction of the grain bulk. Heap of wheat (Nanjing production, water was 18.14%), corn (Nanjing production, water was 14.93%), rice heap (Nanjing production, water was 17.57%), different moisture (water content 11.78%, 13.96%, 15.39%, 18.45 %) of paddy heap (Late Indica 521) angle of internal friction are as normal compressive stress decreases, the normal stress of 25kpa ~ 100kpa, the wheat heap (Nanjing production, water was 18.14%) , maize (Nanjing production, water was 14.93%), rice heap (Nanjing production, water was 17.57%) of the internal friction angle variation ranges were: 23.75 ° ~ 40.03 °, 26.57 ° ~ 35.75 °, 28.37 ° ~ 39.04 ° . In the normal stress of 25kpa ~ 200kpa, the different moisture (water content of 11.78%, 13.96%, 15.39%, 18.45%) of paddy heap (Late Indica 521) internal friction angle ranged from 26.57 ° ~ 41.35 °. According to the above method to stress the internal friction angle grain species, respectively, the relationship can be obtained by fitting equation: y =-2E-05x ~ 2 - 0.0237x 32.42, y = 0.0007x ~ 2-0.1702x 38.487, y = 0.0003x ~ 2-0.1286x 40.074, y =-3.7072Ln (x) 32.073, where x is the normal stress, y is the angle of internal friction of the grain bulk. Wheat pile friction angle with their increased water content, the water content of 10.96% ~ 18.14%, the internal friction angle of wheat reactor ranges from 19.19 ° ~ 32.62 °; when the moisture content of corn 17.75% 11.05% ~ time Its internal friction angle are as moisture increases, which ranged from 23.4 ° ~ 33.76 °; under water and wheat and corn heap heap angle of internal friction, respectively, the relationship can be obtained by fitting equation: y = 0.1934 x ~ 2 - 4.4372x 47.429, y = 0.0078x ~ 2 0.7792x 16.665, where x is the water content, y is the angle of internal friction of the grain bulk; paddy pile (Nanjing production, water content of 11.25% ~ 17.57%) of the internal friction angle no obvious connection to its water content, when the moisture increased, which may increase the angle of internal friction, may also be reduced, does not show a certain regularity. Through analysis of variance under different normal stress four moisture paddy heap (Late Indica 521) internal friction angle difference is small, ie moisture ranged from 11.78% ~ 18.45%, the internal friction angle does not change with moisture changes. Different varieties of rice heap (Nanjing production, late indica 521) internal friction angle difference was not significant. Paddy internal friction angle greater than the angle of internal friction of corn, maize, wheat, internal friction angle is greater than angle of internal friction. Triaxial experimental results show that: through triaxial apparatus measured moisture content of 10.96%, 15.90% of the wheat pile friction angle varied from 25.01 ° ~ 27.46 °, 27.8 ° ~ 31.03 °. Triaxial test than the shear experiment measured the internal friction angle heap of wheat were too large. As the confining pressure (50kpa ~ 200kpa) increases, the wheat grain heap heap elastic modulus increases, the range of 314.2kpa ~ 902.1kpa, heap of wheat under confining pressure and angle of internal friction relationship can be obtained by fitting equation: y = 418.92Ln (x) - 1325.2, where x is the confining pressure, y is the elastic modulus. Wheat reactor (water content of 13.70%, 16.4% and 18%) of the volume with confining pressure (5kpa ~ 30kpa) reduced the increase, the volume change rate was 2.9% 11.6% 3.1% 12.5% from 3.3% to 13.1%. Heap of wheat (moisture of 13.7%, 16.4%, 18%) of the volume change modulus with confining pressure (5kpa ~ 30kpa) the increase of their volume change modulus ranges were 173.5kpa ~ 259.3kpa , 164kpa ~ 240kpa, 151kpa ~ 229.4kpa. Wheat pile modulus decreases with water, when the heap of wheat moisture content of 13.7% to 18%, the bulk modulus which ranged 223.5kpa ~ 270kpa.

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