Wplyw wlasciwosci mechanicznych ziarna pszenicy na rozklad obciazenia w zbiorniku

• Autorzy: Horabik J

Warianty tytułu

EN

Load distribution in a model bin as influenced by mechanical properties of wheat grain

• Języki publikacji: PL

Abstrakty

EN

To describe mechanical behaviour of a granular material it is indispensable to have parameters such as the coefficient of friction on a bin wall, the angle of internal friction and the bulk density and the k-value in Janssen's equation. The values of these parameters depend on many known and unknown factors. In the case of plant granular solids indisputable is the role of moisture content of grain, vertical pressure and sliding velocity. The purpose of this study was to determine the influence of mechanical properties of wheat grain on wall and bottom load distribution in a model grain bin. A series of tests involving eight filling methods, eccentric discharge from five different locations of a bin orifice and three bin wall surfaces were conducted on a laboratory scale cylindrical bin 0.61 m in diameter and 2.44 m high. The wall and flat floor of the bin were supported independently on three load cells so that load distributions could be isolated. Static and dynamic wall and bottom loads were found to be influenced by the filling method. Shower filling produced lower static load of the smooth wall as compared to central filling and higher static load of corrugated and rough walls. The experiments showed a significant influence of grain orientation on load distribution. Variable angle of internal friction within the Janssen differential element can explain the non-uniform load distribution obtained. The horizontal bending moments exerted on the wall and floor of the bin during eccentric discharge were found to decrease with an increase in the bin wall friction coefficient and were influenced significantly by the orifice eccentricity ratio, with the maximum moment occurring at ER equal to 0.667. The horizontal pressure distribution around the circumference of the bin wall depends on the height from the floor. Near the floor of the bin the horizontal pressure was larger on the side of the bin opposite the discharge orifice, while for locations higher above the floor, the horizontal pressure was larger on the side nearest the discharge orifice. As the ratio of the grain height to the bin diameter decreased below approximately 1 a change in the direction of the resultant friction force on the bin wall from a normal downward direction to an upward direction was observed. The change in direction of the resultant tangent force originates from the combination of the downward friction force of flowing grain and the upward friction force of the grain contained within the dead zone of the bin. Moisture content of grain influences its compressibility, friction against the bin wall, height of the dead zone and, in consequence, the upward movement of grains in the dead zone of the flat bottom bin during discharge.

Słowa kluczowe

PL

agrofizyka; pszenica; ziarno; materialy sypkie; wlasciwosci mechaniczne; badania modelowe; naprezenia; obciazenia statyczne; obciazenia dynamiczne; rozklad obciazen; zbiorniki cylindryczne; anizotropia

EN

agrophysics; wheat; grain; granular material; mechanical property; model research; stress; static load; dynamic load; load distribution; cylindrical bin; anisotropy

• Wydawca: -
• Czasopismo: Acta Agrophysica
• Rocznik: 1994
• Tom: 01
• Opis fizyczny: s.71,wykr.,rys.,tab.,bibliogr.

Twórcy

autor

Horabik J

Bibliografia

• 1. ASAE Standards, HP433, Loada exerted by free-flowing grains on bins. St. Joseph, Ml. 49085, 1989.
• 2. ASAE Standards, D274. Flow of wheat through orifices. St. Joseph, MI. 49085, 1991.
• 3. Balassy Z., Bochyński W., Horabik J., Molenda M.: iriaxiat and direct shear tests on mass of seeds of wheat. Proceedings oE the 4th International Conference "Physical Properties of Agricultural Materials", Rostock, 31-36, 1989,
• 4. Balassy Z., Horabik J., Molenda M.: On friction properties of wheat grain. ZPPNR, 378, 11-19, 1989.
• 5. Benink E.J.; flow and stress analysis of cohesionless bulk material in silos related to codes. Ph.D. Dissertation, University of Twente, Department oE Mechanical Engineering, Enschede, The Netherlands, 1989.
• 6. Bock R.G., Puri V.M., Manbeck H.I3.: Modeling stress relaxation response of wheat en masse using the triaxial test. Transactions of the ASAE, 32(5), 1701-1708, 1989.
• 7. Borcz A.: Experimentally determined pressure exerted on watts and bottom in grain silos. Pr. nauk. Inst. Bud. l'Wr., nr 52, Wrocław 1987.
• 8. Borcz A.: Silosy w przemyśle materiałów wiążących. Prace nauk. Inst. Bud. PWr,, Wrocław 1987.
• 9. Borcz A., Maj M., Trochanowski A.: Wytyczne projektowania, budowy i użytkowania silosów żelbetowych. Pr, nauk. Inst. Bud. PWr., nr 61, Wrocław 1991,
• 10. Boruszak A,, Sygulski R.: farcie materiałów sypkich na ściany silosów. Inż. i Bud. nr 10, 393-397, 1972.
• 11. Brubaker J.E., Pos J,: Determining static coefficients of friction of grains on structural surfaces. Transactions of Ihe ASAE, 8(1), 53-55, 1965,
• 12. Bucklin R.A.. Thompson S.A., Ross I.J.: Din wall failure caused by eccentric discharge of free- flowing grain. ASCF. Journal of Structural Engineering, 116(11), 3175-3190, 1990.
• 13. Bucklin R.A., Thompson S.A., Ross I.J.; Flow patterns in model grain bins. Transactions of the ASAE, 34(2), 577-585, 1991.
• 14. Canadian Farm Building Code, Associate Committee on the National Building Code, National Research Council of Canada, Ottawa 1977.
• 15. Clower R.E., Ross I.J., White G.M.: Properties of compressible granular materials as related to forces in bulk storage structures. Transactions of the ASAE, 16(3), 476-481, 1973.
• 16. Colijn H„ Peschl I.A.S.Z.: Non-symmetrical bin flow problems. Bulk Solids Handling, 1(3), 377- 384, 1981.
• 17. Deutsch G.P., Schmidt L,C,: Pressures on silo walls, Transactions of the ASME, 91, 450-459, 1969.
• 18. DIN 1055, Part 6. Design toads for bildings: load in silo bins. Deutsche Norm, 1987.
• 19. Drescher A.: Metody obliczeń parć i przepływu materiałów ziarnistych w zbiornikach. PWN, Warszawa 1983.
• 20. Dziendziel A,, Kobielak S., Rybiański M.: Obliczanie parć poziomych w silosach na przetwory zbożowe. Materiały VI Krajowej Konferencji Naukowo-Technicznej pt.: Problemy techniki pobierania, doprowadzania i dozowania materiałów ziarnistych, Warszawa, 42-58, 1979.
• 21. Grabiec K.: Konstrukcje cienkościenne. PWN, Warszawa-Poznań 1978.
• 22. Grochowicz M.: An evaluation of internat friction of wheat grain. 4. Thgung of Agrophysik, Rostock, 140-145, 1987.
• 23. Grochowicz M., Horabik J., Molenda.: Zastosowanie aparatu trójosiowego ściskania do badania właściwosci machanicznych ośrodków rozdrobnionych pochodzenia roślinnego. ZPPNR, 320, 107- 114, 1987.
• 24. Grochowicz J., Horabik J., Molenda M.: The influence of surface roughness and moisture content on friction of wheat grain. ZPPNR, 397, 33-39, 1991.
• 25.Grundas S., Horabik J.: Wpływ wilgotności na lepko-sprężyste właściwości zboża. Polskie Towarzystwo Biofizyczne, Biofizyka (prace doświadczalne), Siedlce, 299-316, 1980.
• 26.Haman J., Grochowicz M.: Methodology of determination of the internal friction coefficient of grain layer at increased strains, ZPPNR, 203, 153-159, 1978.
• 27.Hampe E., Flatau K.A.: Silo pressure due to ecccntric discharge. 11th Working Session of the I ASS Committee of Pipers and Tanks, Pr. nauk. Inst. Bud. PWr„ nr 39, Wrocław, 161-178, 1983.
• 28.Horabik J. Molenda M.: Die Anwendung des Dreiachsenapparais zur Untersuchung mechanischer Eigenschaften der Kornmasse. Wissenschaftlichen Tagung Agrophysik, Reinhardsbrunn, NRD, 355-358, 1984,
• 29.Horabik J.: Description of the initial phase of gravitational discharge of granular material from a hopper. International Agrophysics, 2(1), 31-43, 1986.
• 30.Horabik J., Molenda M.: Wpływ orientacji przestrzennej ziaren próbki na kąt tarcia wewnętrznego mierzony metodą trójosiowego ściskania. ZPPNR, 351, 133-140, 1988.
• 31.Horabik J,, Molenda M.: Force and contact area of wheat grain in friction. J. agric. Engng Res. 41, 33 42, 1988,
• 32.Horabik J.A., Ross I.J., Schwab C.V: Effects of spatial orientation on grain load distribution. Transactions of the ASAE, 31(6), 1787-1793, 1988.
• 33.Horabik J., Molenda M.: True contact area between wheat grain and a flat surface. ZPPNR, 378, 63-68, 1989.
• 34.! torabik J,, Molenda M.: Factors affecting friction of single wheat grain. Proceedings of the 4th International Conference "Physical Properties of Agricultural Materials", Rostock, 280-284, 1989.
• 35.Horabik J., Molenda M.: Effects of moisture content on friction of wheat grain at a single contact area. Powder Handling Processing, 1(3), 277-279, 1989.
• 36.Horabik J., Ross I.J., Schwab C.V.: The influence of side filling on load distribution in the bin. ZPPNR, 389, 69-78, 1991.
• 37.Horabik ,1., Ross I.J., Schwab C.V: Watt and bottom loads in a model grain bin during discharge. 'rtansactions of the ASAE, 34(2), 617-620, 1991.
• 38.Horabik J., Schwab C.V,, Ross I.J.: Non symmetrical loads in a model grain bin during eccentric discharge. Ita reactions of the ASAE, 35(3), 987-992, 1992.
• 39.Horabik J., Molenda M., Thompson S.A., Ross I.J.: Asymmetry of bin loads induced by eccentric discharge. Transactions of the ASAE, 36(2), 577-582, 1993.
• 40.Horabik .1., Molenda M,: Opory tarcia i naprężenia w strefie kontaktu ziarniaka pszenicy z płaską powierzchnią. Annales UMCS, Vol. XLV/XLVI, 20, 181-193, 1991.
• 41.H re beck i P„ Fan Jian Hua.: Badania naporu mąki i oirqb w silosach. Itri. i Bud. nr 5, 150-151, 1992.
• 42.Janssen H.A.; Versuche fiber Gelreidedruck in Silozetten. Verein Dcutscher Ingenieure, Zeitschrift (Dusseldorf), 39, 1045-1049, 1895.
• 43.Jenike A.W,: Denting of circular bins with eccentric drawpoints. ASCE Journal of the Structural Division, 93, 27-35, 1967,
• 44.Ketch urn M.S.: The designe of watts, bins and grain elevators. McGraw-Hill Book Co., New York 1919,
• 45.Kamiński M., Zubrzycki M.: Obciążenia w silosach na zboże. Inż. i Bud. nr 10, 368-372, 1978.
• 46.Kamiński M., Zubrzycki M: Wpływ usytuowania otworu wysypowego w komorze silosu na napór poziomy zboża. Inż, i Bud. nr 3, 86-89, 1979.
• 47.Kamiński M., Zubrzycki M.: Żelbetowe silosy na zboże. Badania i projektowanie. Pr. nauk. Inst. Bud. PWr., nr 41, Wroclaw 1985.
• 48.Kamiński M.: Badania naporu bezkohezyjnych materiałów sypkich w silosach. Pr. nauk. Inst. Bud. PWr., nr 50, Wrocław 1986.
• 49.Kubiak .T., Stachurski W: Konstrukcje żelbetowe, t. 4, Arkady, Warszawa 1991.
• 50.Lawton P.J.: Coefficients of friction between eercal grain and various silo wait materials. J. agric. Engng Res. 25(1), 75-86, 1980.
• 51.Loewer O.J., Ross I.J., Kralzer D.D., Walker J.N.: Properties of ground shelled corn as related to forces in bulk storage s crue turcs. Transactions of the ASAE, 20(1), 155-156, 1977.
• 52.Łapko A., Stachurski W.: Doświadczalne określenie efektów działania materiału sypkiego na ściany silosów przy różnym usytuowaniu otworów wysypowych. Inż. i Bud. nr 8, 281-285, 1984.
• 53.Łapko A., Stachurski W.: Badania wpływu niesymetrycznego opróżniania na wielkości współczynników dynamicznych w komorach silosów na zboże. Zeszyty Naukowe Politechniki Warszawskiej, z. nr 84, Budownictwo, Warszawa, 81-105, 1984.
• 54.Łapko A.: Efekty oddziaływania materiału sypkiego na żelbetowe ściany komór w eksploatowanych silosach na zboże. Zeszyty Naukowe Politechniki Białostockiej, nr 71, Białystok 1989.
• 55.Manbeck H.B., Nelson G.L.: Methods and instrumentation for evaluating the stress strain behavior of wheat en masse. Transantions of the ASAE, 15(5), 919-923, 1972.
• 56.Manbeck H.B., Goyal M.G., Nelson G.L., Singh M.G.: Dynamic overpressures in model bins during emptying. ASAE Paper No. 77-4505. ASAE, St. Joseph, MI 49085, 1977.
• 57.McLean A.G., Arnold P.C., Martin D.J.: Simplified mass-flow bin wall load predictions. Bulk Solids Handling, 3(4), 787-793, 1983.
• 58.Metzger T: Analiza wpływu wybranych cech fizycznych ziarna kukurydzy na wartość współczynnika tarcia wewnętrznego. Praca doktorska, Akademia Rolnicza, Wrocław 1985.
• 59.Mitzel A.; Zbiorniki, zasobniki, silosy, kominy i maszty. Budownictwo betonowe, t. XIII. Arkady, Warszawa 1966.
• 60.Mitzel A., Kamiński M., Zubrzycki M.: Wstępne badania kinematyki przepływu ośrodka sypkiego w silosach za pomocą promieni rentgenowskich. XX konferencja naukowa KI Li W PAN - KN PZITB - Krynica, t. 2, 209-216, 1974.
• 61.Molenda M.: Identyfikacja elementarnych mechanizmów tarcia ziarna pszenicy. Praca doktorska, Instytut Agrofizyki PAN, Lublin 1991.
• 62.Molenda M., Horabik J., Ross I.J.: Loads in model grain bins as affected by filling method. Transactions of the ASAE, 36(3), 915-919, 1993.
• 63.Moore D.W., White G.M., Ross I.J.: Friction of wheat on corrugated metal surfaces. Transactions of the ASAE, 27(6), 1842-1847, 1984.
• 64.Moysey E.B.; Active and passive pressures in deep grain bins. Transactions of the ASAE, 22(6), 1409-1413, 1979.
• 65.Moysey E.B.: The effect of grain spreaders on grain friction and bin wall pressures. J. agric. Engng Res. 30, 149-156, 1984.
• 66.Moysey E.B., Shane Hiltz,: Friction properties of fertilizers. Can. Agric, Eng. 27(2), 79-84, 1985,
• 67.Mróz Z., Kwaszczyńska K,: Pewne problemy brzegowe dla ciał rozdrobnionych o wzmocnieniu gęstościowym. Rozpr. Inż. 19, 15-42, 1971.
• 68.Mróz Z., Szymański Cz.: Gravity flow of a granular material in a converging channel. Arch. Mech. Stos. 1971, 23, 897-917, 1971."
• 69.Munch-Andersen J., Nielsen J.: Pressures in slender grain silos. Measurements in three silos of different sizes. 2nd Kuro pean Symposium on the Stress and Strain Behaviour of Particulate Solids-Silo Stresses. Praha, Czechoslovakia, 1990.
• 70.Necasek M., Vrtel J.: Force effects of particulate solids on silo walls by eccentric emptying (Experiments). 2nd European Symposium on the Stress and Strain Behaviour of Particulate Solids- Silo Stresses. Praha, Czechoslovakia, 1990.
• 71.Nielsen J.: Load distribution in silos influenced by anisotropic grain behaviour. International Conference on Bulk Materials Storage, Handling and Transportation, Newcastle, 1983.
• 72.Oda M.: Fabrics and their effects on the deformation behaviours of sand. Dept. Found. Engng. Fac. Engng. Sa i lama University, Special Issue, 1976.
• 73.Oda M.; Significance of fabric in granular mechanics. Proc. US-Japan Seminar, Sendai, Japan, 7-26, 1978.
• 74.Pieper K,: Investigation of silo toads in measuring models. Journal oi Engineering for Industry. Transactions of the ASME, 91, 365-372, 1969.
• 75.Pieper K.; Silolasten. Aufbereitungs-Technik, nr 11, 541-547, 1978.
• 76.Pieper K.: Wskazówki do wyznaczania obciążeń silosów. In¿. i Bud. nr 1, 20-24, 1981.
• 77.PN-89/B-03262. Zbiorniki żelbetowe na materiały sypkie i kiszonki. Obliczenia statyczne i projektowanie.
• 78.Ravenet J.: Silo problems. Bulk Soils Handling, 1(4), 667-679, 1981,
• 79 Recommended practice for design and construction of concrete bins, silos, and bunkers for storing granular material (AC1 313,77) (Revised 1983, Revised 1992) and Commentary. Amer. Concr. Inst., Detroit, MI.
• 80.Ross I.J., Bridges T.C., Loewer O J., Walker J.N.: Grain bin loads as affected by grain moisture content and vertical pressure. Transactions of the ASAE, 22(3), 592-597, 1979.
• 81.Rotter J.M., Berry P.A.: The discrete rupture surface theory for silos under eccentric discharge. 2nd European Symposium on the Stress and strain Behaviour of Particulate Solids-Silo Stresses. Praha, Czehoslovakia, 1990.
• 82.Rybiański M.; Wpływ smukłości komory na obciążenia w opróżnianych centrycznie i niecentrycznie silosach zbożowych. XXIX konferencja naukowa KILiW PAN - KN PZITB - Krynica, t. 2, 151- 156, 1983.
• 83.Rybiański M,: Obciążenia den silosów o różnej smuklości komór. Inż. i Bud. nr 4-5, 179-180, 1986.
• 84.Rybiański M.: Obciążenia den zbiorników na materiały sypkie opróżnianych centrycznie i niecentrycznie. XXXIII konferencja naukowa KILiW PAN - KN PZITB - Krynica, t. 1, 109-114, 1987.
• 85.Rybiański M., Kramnik J.: Parcie materiału sypkiej w zbiornikach o różnych rodzajach przepływu. Inż. i i Bud. nr 6, 241-244, 1991.
• 86.Safarian S.S.: Design Pressure of Granular materials in silos. AC I Journal, 647-655, 1969.
• 87.Schwab, C.V.: Grain pressure phenomenon in a circular flat bottom bin. PhD. Disseration, University of Kentucky, Lexington, Kentucky 1989.
• 88.Schwedes J.: Flieflverhalten von Schiiitgutem in iiunkern. Verlag Chemie, 1970.
• 89.Schwedes J.-. Evolution of Bulk Solids Technology Since 1974. Bulk, Solids, Handling, 3(1), 143- 147, 1983.
• 90.Schwedes J,; Influence of wall friction on silo design in process and structural engineering. Ger. Chem. Eng., 8, 131-138, 1985.
• 91.Singh Divgir, E,B. Moysey,: Grain bin wall pressures: Theoretical and experimental. Can. Agric. Eng., 27(1), 43-48, 1985.
• 92.Snyder L.H., Roller W.L., Hall G.E.: Coefficients of kinetic friction of wheat on various metal surfaces. Transactions of the ASAE, 10(3), 411-419, 1967.
• 93.Steward B.R., Hossain Q.A., Kunze O.R.: friction coefficients of sorghum grain on steel, teflon and concrete surfaces. Transactions of the ASAE, 12(4), 415-418, 1969.
• 94.Snot B., Hurabik J., Molenda.: The effect of the spatial orientation of cereal grain in bulk on its mechanical behaviour. Collection of papers, Faculty of Mechanization, College of Agriculture in Prague, 873-878, 1985,
• 95.Theimer O.R: Failures of reinforced concrete grain silos. Transactions of the ASME, 91, 460-477, 1969.
• 96.Thompson S.A., Ross I.J., Walker J.N., Wells L.G.: Vertical wall loads in a model grain bin. Transactions of the ASAE, 21(5), 1344-1348, 1982.
• 97.Thompson S.A., Ross I.J.'. Compressibility and frictional coefficient of wheat. Transactions of the ASAE, 26(4), 1171-1176, 1983.
• 98.Thompson S.A., Prather TG.: Dynamic wall loads in a corrugated walled model grain bin. Transactions of the ASAE, 27(3), 875-878, 1984.
• 99.Thompson S.A., Ursy J.L., Legg J.A.: Loads in a model grain bin as affected by various unloading techniques. Transactions of the ASAE, 29(2), 556-561, 1986.
• 100.Thompson S.A., Bucklin R.A., Batich C.D., Ross I.J.: Variation in the apparent coefficient of friction of wheat on galvanized steel. Transactions of the ASAE, 31(5), 1518-1524, 1988,
• 101.Tomczyk S.: Magazyny ziarna i innych nasion. PWRiL Warszawa 1970.
• 102.Williams J.C., Al-Salman D., Birks A.H.: Measurement of static stresses on the wall of a cylindrical container for particulate solids. Powder Technology, 50, 163-175, 1987.
• 103.Wol-Gajewska B.; Zastosowanie związków teorii plastyczności do analizy nieustalonego wypływu ośrodków sypkich ze zbiorników. Prace IPPT, 28/1978.
• 104.Zawidzki J.: Ustalony dynamiczny grawitacyjny wypływ ośrodków sypkich. Prace IPPT, 11/1971.
• 105.Zhang Q., Puri VM., Manbeck 11.B.: Model for frictional behavior of wheat on structural materials. Transactions of the ASAE, 31(3), 898-903, 1988.
• 106.Zhang Q., Puri V.M., Manbeck II.B., Wang M.C.: Elastoplastic constitute parameters of en masse wheat for a cyclic load model. Transactions of the ASAE, 31(3), 910-916, 1988.
• 107.Zhang Q., Britton M.G., Jaremek R.t Discharge loads in smooth and corrugated walled model bins for wheat, barley and canola. ASAE Paper No. 91-4063, ASAE, St. Joseph, Michigan 49085, 1991.
• 108.Zubrzycki M.: Badania efektów dynamicznych w silosach metalowych podczas ich eksploatacji, Inż. i Bud, nr 4, 133-137, 1988.