Click on “Download PDF” for the PDF version or on the title for the HTML version.

If you are not an ASABE member or if your employer has not arranged for access to the full-text, Click here for options.

Highlights

Bulk corn kernels were compressed at different moisture contents and compressive forces.

ABSTRACT. Understanding the mechanical properties of bulk corn is important in preventing agricultural confined space-related accidents such as grain bin entrapment and engulfment. Various qualities of bulk corn, including clean corn, corn with foreign materials (FM), and moldy corn samples were compressed at 42, 77, 106, and 130 N force levels. The compressive behavior of samples was measured at 13.2%, 16.2%, 18.9%, and 21.7% wet basis moisture contents. All samples were compressed at a strain rate of 1.25 mm/min, and the strain was kept constant for 200 s to determine the stress relaxation properties. In clean corn, the energy absorbed increased with moisture content, and the formation of clumps was observed at 21.7% moisture content. Solidity decreased with moisture content, resulting in high cohesion at moisture contents 18.9% and 21.7% for clean corn. In corn with FM, the energy absorbed did not follow a definite pattern with moisture content and no clump formation was observed. For moldy corn, the energy absorbed increased with force resulting in clump formation irrespective of the force level. This study provides further insights into the mechanical behavior of bulk corn under compression, such as solidity and compressive strength. An increase in the compressive strength or a decrease in the solidity of stored shelled corn in a grain bin increases compaction, cohesion, and the formation of clumps. The study also implies potential risks in grain bins when the kernels are moldy and stored at high moisture content.