Strona 2_redak - Instytut Agrofizyki im. Bohdana DobrzaÅskiego ...

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130 Table 16.20. Mean values (±St. Dev.) of the friction coefficient µ of corn grain variety Mieszko at the moisture content of 10-20% against stainless steel, galvanized steel and concrete B30 determined at the normal pressure of 0.5-2.5 kPa Moisture content (%) Normal stress (kPa) Coefficient of friction µ Stainless steel Galvanized steel Concrete B30 10 0.5 1.0 1.5 2.1 2.5 0.292 ± 0.001 0.294 ± 0.003 0.289 ± 0.007 0.269 ± 0.003 0.246 ± 0.006 0.273 ± 0.007 0.259 ± 0.008 0.258 ± 0.005 0.234 ± 0.002 0.232 ± 0.007 0.402 ± 0.002 0.326 ± 0.022 0.376 ± 0.030 0.393 ± 0.014 0.382 ± 0.020 12.5 0.5 1.0 1.5 2.1 2.5 0.262 ± 0.014 0.261 ± 0.016 0.259 ± 0.015 0.253 ± 0.013 0.249 ± 0.010 0.290 ± 0.005 0.249 ± 0.007 0.265 ± 0.007 0.251 ± 0.006 0.260 ± 0.005 0.369 ± 0.005 0.369 ± 0.027 0.441 ± 0.021 0.398 ± 0.011 0.385 ± 0.010 15 0.5 1.0 1.5 2.1 2.5 0.267 ± 0.015 0.259 ± 0.006 0.252 ± 0.006 0.245 ± 0.010 0.242 ± 0.014 0.248 ± 0.011 0.245 ± 0.009 0.245 ± 0.009 0.244 ± 0.013 0.238 ± 0.006 0.408 ± 0.006 0.418 ± 0.011 0.431 ± 0.023 0.405 ± 0.020 0.332 ± 0.005 17.5 0.5 1.0 1.5 2.1 2.5 0.253 ± 0.011 0.268 ± 0.005 0.255 ± 0.019 0.255 ± 0.012 0.235 ± 0.007 0.263 ± 0.016 0.266 ± 0.007 0.252 ± 0.005 0.252 ± 0.006 0.251 ± 0.013 0.476 ± 0.028 0.501 ± 0.025 0.469 ± 0.016 0.509 ± 0.039 0.497 ± 0.011 20 0.5 1.0 1.5 2.1 2.5 0.303 ± 0.010 0.268 ± 0.012 0.265 ± 0.018 0.254 ± 0.023 0.253 ± 0.009 0.284 ± 0.008 0.269 ± 0.012 0.260 ± 0.010 0.254 ± 0.009 0.256 ± 0.019 0.501 ± 0.013 0.479 ± 0.012 0.494 ± 0.013 0.577 ± 0.001 0.554 ± 0.023
131 Table 16.21. Mean values (±St. Dev.) of the friction coefficient µ of oat grain variety Borowiak at the moisture content of 10-20% against stainless steel, galvanized steel and concrete B30 determined at the normal pressure of 0.5-2.5 kPa Moisture content (%) 10 12.5 15 17.5 20 Normal stress (kPa) 0.5 1.0 1.5 2.1 2.5 0.5 1.0 1.5 2.1 2.5 0.5 1.0 1.5 2.1 2.5 0.5 1.0 1.5 2.1 2.5 0.5 1.0 1.5 2.1 2.5 Coefficient of friction µ Stainless steel Galvanized steel Concrete B30 0.268 ± 0.004 0.271 ± 0.010 0.359 ± 0.015 0.260 ± 0.006 0.253 ± 0.001 0.359 ± 0.003 0.246 ± 0.006 0.255 ± 0.007 0.356 ± 0.002 0.237 ± 0.004 0.246 ± 0.007 0.380 ± 0.021 0.237 ± 0.006 0.237 ± 0.006 0.353 ± 0.039 0.257 ± 0.001 0.262 ± 0.003 0.404 ± 0.001 0.251 ± 0.001 0.260 ± 0.002 0.404 ± 0.001 0.247 ± 0.011 0.247 ± 0.001 0.369 ± 0.001 0.252 ± 0.008 0.241 ± 0.001 0.347 ± 0.001 0.245 ± 0.005 0.236 ± 0.006 0.372 ± 0.006 0.264 ± 0.009 0.260 ± 0.005 0.335 ± 0.005 0.259 ± 0.005 0.253 ± 0.004 0.335 ± 0.011 0.250 ± 0.006 0.241 ± 0.007 0.344 ± 0.005 0.250 ± 0.009 0.235 ± 0.002 0.314 ± 0.005 0.235 ± 0.003 0.231 ± 0.006 0.296 ± 0.005 0.267 ± 0.002 0.265 ± 0.004 0.357 ± 0.009 0.262 ± 0.004 0.262 ± 0.006 0.369 ± 0.005 0.243 ± 0.010 0.246 ± 0.004 0.372 ± 0.005 0.240 ± 0.009 0.239 ± 0.005 0.350 ± 0.005 0.235 ± 0.014 0.230 ± 0.010 0.357 ± 0.016 0.276 ± 0.004 0.269 ± 0.002 0.388 ± 0.011 0.251 ± 0.006 0.247 ± 0.008 0.376 ± 0.010 0.235 ± 0.004 0.242 ± 0.004 0.392 ± 0.015 0.244 ± 0.005 0.234 ± 0.005 0.428 ± 0.006 0.233 ± 0.005 0.229 ± 0.006 0.434 ± 0.001
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EC Centre of Excellence AGROPHYSICS
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4 9.3. Factors influencing the coef
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6 BASIC NOTATION c - cohesion [kPa]
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8 Numerous granular materials when
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10 the tensor of plastic strain inc
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12 Fig. 2.1. Yield curves with comp
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14 Stable or unstable behaviour of
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16 In turn, the model of Lade, also
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18 same porosity need not have iden
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20 where: A = ∫ E( β) sin βdβ
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22 (β = 0 o ), positioning the out
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24 grain was poured into the mould
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26 axes of the ellipse characterizi
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28 [176] for the determination of p
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30 A different approach to the desc
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32 where: I - moment of inertia, k
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34 a) b) f s f s m M f n f n Contac
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36 The micropolar model yields resu
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38 Fig. 3.17. Model of shear band f
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40 In the case of agricultural mate
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42 5.2. Density of consolidated mat
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44 (cereal grain, sand, soil), the
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46 Multiple wetting and drying of g
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48 vertical pressure within the ran
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50 of the curve defined by A, where
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52 6. Vertical consolidation refere
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54 poured into the box without vibr
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56 7.2.2. Bulk density Stress-strai
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58 near the box wall and lifted alo
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60 and the upper boundary was 18.5
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62 A -1 5 -1 0 -5 1 0 5 -5 5 1 0 1
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64 Fig. 8.2. Yield locus and effect
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66 in such a way that friction woul
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68 a) b) µ = tg ϕw ϕ w c) d) e)
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70 9.3. Factors influencing the coe
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72 galvanized steel received from d
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74 9.3.4. Velocity of sliding Becau
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76 1+ sinϕ k = . 1 − sinϕ (10.3
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78 N ϕ VLQϕ 3UHVVXUHUDWLRN
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Page 82 and 83: 82 10.4.3. Moisture content With in
Page 84 and 85: 84 Table 10.1. Measured (k s ) and
Page 86 and 87: 86 conventional engineering analyse
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Page 90 and 91: 90 also be performed as a function
Page 92 and 93: 92 reliable processing and stable v
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Page 96 and 97: 96 The Chute Index (CI) is recommen
Page 98 and 99: 98 obtained the maximum deviation o
Page 100 and 101: 100 efficient flow control using op
Page 102 and 103: 102 In the field of experimental in
Page 104 and 105: 104 22. Britton M.G., Moysey E.B.:
Page 106 and 107: 106 69. Horabik J., Rusinek R.: Pre
Page 108 and 109: 108 114. Morland L.W., Sawicki A.,
Page 110 and 111: 110 158. 6WSQLHZVNL$ Influence of m
Page 112 and 113: 112 16. APPENDIX - Physical Propert
Page 114 and 115: 114 16.2. Density and porosity Tabl
Page 116 and 117: 116 Table 16.7. Mean values (±St.
Page 126 and 127: 126 Table 16.16. Cont. 1 2 3 4 Icin
Page 136 and 137: 136 Table 16.25. Cont. 1 2 3 4 Icin
Page 140 and 141: 140 Table 16.29. Cont. Table sugar
Page 144 and 145: 144 Table 16.35. Mean values (± St
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