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

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142 Table 16.31. Mean values (±St. Dev.) of the pressure ratio k s and k 3 and the angle of internal friction ϕ of rape seeds variety Licosmos at the moisture content of 6-15% Material Rape seeds Licosmos Moisture content (%) 6 9 12 15 k s 0.46 ± 0.02 0.28 ± 0.04 0.27 ± 0.02 0.24 ± 0.02 k 3 = 1.1(1–sinϕ) 0.64 ± 0.02 0.54 ± 0.01 0.52 ± 0.01 0.47 ± 0.01 Angle of int. friction ϕ (deg) 24.7 ± 0.5 30.6 ± 0.4 31.7 ± 0.7 34.8 ± 0.7 Table 16.32. Mean values (±St. Dev.) of the pressure ratio k s and k 3 and the angle of internal friction ϕ of selected seeds Material Amaranth. Rawa White mustard. Borowska Pea. Piast Buckwheat. Kora Lentils. Tina Soybeans. Aldana Moisture content (%) 8 9 10 10 8 8 k s 0.62 ± 0.02 0.43 ± 0.01 0.53 ± 0.01 0.59 ± 0.02 0.56 ± 0.01 0.37 ± 0.02 k 3 = 1.1(1–sinϕ) 0.70 ± 0.02 0.64 ± 0.01 0.59 ± 0.01 0.68 ± 0.02 0.82 ± 0.02 0.55 ± 0.01 Angle of int. friction ϕ (deg) 21.3 ± 0.8 24.7 ± 0.4 27.3 ± 0.6 22.0 ± 0.8 14.3 ± 0.4 30.1 ± 0.9 Table 16.33. Mean values (±St. Dev.) of the pressure ratio k s and k 3 and the angle of internal friction ϕ of selected food powders Material Flour Coarse flour Semolina Wheat groats Pearl barley groats Oat meal Icing sugar Table sugar Potato starch Powder milk Granulated milk Table salt Corn meal Soybean meal Moisture content (%) 12.7 13.4 12.7 13.6 13.2 11.0 0.4 0.4 18.2 4.4 7.9 0.2 11.7 8.5 k s 0.26 ± 0.01 0.37 ± 0.02 0.38 ± 0.02 0.37 ± 0.02 0.36 ± 0.02 0.40 ± 0.01 0.31 ± 0.02 0.47 ± 0.02 0.47 ± 0.02 0.40 ± 0.02 0.34 ± 0.02 0.31 ± 0.01 0.45 ± 0.02 0.53 ± 0.02 k 3 = 1.1(1–sinϕ) 0.56 ± 0.02 0.62 ± 0.02 0.51 ± 0.02 0.59 ± 0.02 0.55 ± 0.02 0.72 ± 0.02 0.52 ± 0.02 0.53 ± 0.04 0.44 ± 0.02 0.48 ± 0.03 0.50 ± 0.03 0.50 ± 0.03 0.55 ± 0.02 0.51 ± 0.03 Angle of int. friction ϕ (deg) 29.2 ± 1.0 26.1 ± 0.8 32.4 ± 1.0 27.8 ± 1.0 30.0 ± 1.0 20.0 ± 1.0 31.7 ± 1.0 31.4 ± 2.0 37.0 ± 1.0 34.3 ± 1.5 33.2 ± 1.5 32.8 ± 1.5 30.2 ± 1.1 32.2 ± 1.6
143 16.7. Modulus of elasticity and Poisson’s ratio Table 16.34. Mean values (±St. Dev.) of the elasticity modulus E and the Poisson’s ratio ν of cereal grain at the moisture content of 10-20% Material Moisture content (%) Modulus of elasticity Ε (MPa) Poisson’s ratio ν Wheat Begra 10 12.5 15 17.5 20 22.4 ± 4.6 22.2 ± 4.4 19.3 ± 2.5 17.2 ± 3.6 11.1 ± 1.1 0.22 ± 0.01 0.18 ± 0.02 0.20 ± 0.03 0.20 ± 0.01 0.19 ± 0.01 Rye Amilo 10 12.5 15 17.5 20 23.6 ± 2.3 20.9 ± 1.2 20.2 ± 1.9 20.0 ± 1.8 15.1 ± 1.5 0.19 ± 0.01 0.20 ± 0.01 0.21 ± 0.01 0.21 ± 0.01 0.21 ± 0.01 Barley Rudnik 10 12.5 15 17.5 20 14.2 ± 1.6 14.0 ± 1.8 13.8 ± 1.1 12.3 ± 0.8 10.4 ± 2.4 0.19 ± 0.01 0.16 ± 0.01 0.15 ± 0.01 0.17 ± 0.01 0.19 ± 0.01 Corn Mieszko 10 12.5 15 17.5 20 26.2 ± 3.2 19.3 ± 2.7 15.9 ± 0.9 15.5 ± 2.6 12.3 ± 1.4 0.20 ± 0.01 0.20 ± 0.01 0.20 ± 0.02 0.19 ± 0.02 0.20 ± 0.02 Oats Borowiak 10 12.5 15 17.5 20 17.8 ± 2.8 16.0 ± 3.2 13.2 ± 3.1 10.7 ± 2.4 10.4 ± 1.9 0.18 ± 0.01 0.20 ± 0.01 0.17 ± 0.01 0.17 ± 0.01 0.15 ± 0.01 Triticale Fidelio 10 12.5 15 17.5 20 20.4 ± 2.6 18.5 ± 1.6 18.4 ± 1.4 14.7 ± 1.8 9.2 ± 0.9 0.20 ± 0.02 0.22 ± 0.01 0.20 ± 0.01 0.21 ± 0.03 0.21 ± 0.01
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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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80 10.4.1. Friction force mobilizat
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82 10.4.3. Moisture content With in
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84 Table 10.1. Measured (k s ) and
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86 conventional engineering analyse
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88 a, b - product-dependent coeffic
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90 also be performed as a function
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Page 96 and 97: 96 The Chute Index (CI) is recommen
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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
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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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