Static stress distribution in tall cylindrical bins filled with pseudosolid grains
Atewologun, Adenuga Olatunde
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https://hdl.handle.net/2142/20632
Description
Title
Static stress distribution in tall cylindrical bins filled with pseudosolid grains
Author(s)
Atewologun, Adenuga Olatunde
Issue Date
1990
Doctoral Committee Chair(s)
Riskowski, Gerald L.
Department of Study
Agricultural and Biological Engineering
Discipline
Agricultural Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Agricultural
Engineering, Civil
Language
eng
Abstract
The controversy over the ratio of the intensities of the horizontal and vertical stresses in the grain mass and on the walls of storage bins has continued for some time. This ratio is commonly referred to as the K ratio. Four different experimental methods were used to determine K in a model cylindrical bin. At rest, measurements inside the mass of soybean grains revealed a decrease in the K ratio as the depth of material (or overburden pressure) increased along the axis of the bin. At large depths, the K ratio approached a constant value that may be approximated by K$\sb0$ = 1 $-$ sin$\rho$, where $\rho$ is the angle of friction of grain to grain. Direct wall measurements from electrical strain gages and from load cells fitted flush with the wall gave identical results of K ratio at large depths of material. Determination of K ratio from measurements of load carried by a separately supported floor revealed an averaging of K ratios over the depth of stored material. Thus the floor load method gave the highest value of K ratio at large depths of grain.
In-mass measurements were found to give reliable full field data for static loads. The K ratio for soybeans at 9.2% moisture content (wet basis) was found to be 0.47, based on the in-mass and wall measurements. It is recommended that future grain storage bin design be based on experimental determination of K by the use of a well-designed in-mass transducer. Static and dynamic load patterns may be successfully investigated with an in-mass transducer. To cut down on scatter, such an in-mass transducer should either be relatively large compared to the size of grain particles or have grains fixed on it.
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