Caracterização das propriedades de fluxo e mecânicas de grãos agrícolas.

Abstract

Analyses of the structures of the silos has been highlighted in several areas of research related to storage systems, since there is no standardization of the design of these structures. Collapses and ruins in silos can be attributed to the fact that many designers combine the structural calculation of these the same principle fluid reservoir not considering, however, the friction of the stored product with the silo wall. . The research aimed to determine the physical, mechanical and flow of granular products (maize, millet and soybeans), with moisture contents of 10, 12 e14% (wb). Was adopted for determining the flow properties of the methodology recommended by the British Materials Handling Board - BMHB (1985) and data acquisition equipment used the direct shear by translation TGS 70-140 "Jenike Shear Cell. . For the mechanical properties was used a cell with a uniaxial compression set compression loads of 5, 10, 15, and 20kN. The results showed that the grains are characterized as easy flow, for the experimental factor k (kexp.) presented higher values of calculated by the equations proposed by researchers and by international standards for the Poisson's ratio calculated for both charging as unloading, values were higher than the experimental occurring increase with increasing moisture content, the modulus of elasticity for this experiment and proved to be higher with increasing the moisture content of the values was an increase in the modules;, the angle of expansion was reduction in earnings with increasing moisture content. For the vertical stress curve (y) versus vertical deformation (y) showed, in all the tests, similar to the theoretical behavior.