Evaluation of strain gage load cell for the determination of compressive failure characteristic of rough rice (Oryza sativa)
2008
Royo, M.D.O., Philippines Univ. Los Baños, College, Laguna (Philippines). Coll. of Engineering and Agro-Industrial Technology
The study aimed to evaluate a load cell to determine the compressive failure characteristic of rough rice (Oryza sativa). The evaluation of the load cell was based on its load capacity, its allowable operating range and the operating range in the determination of the compressive failure behavior of rough rice. For the different samples of rough rice having different thickness ranging from 1.77 mm to 2.19 mm and different moisture content, wet basis (24.40%, 21.60%, 19.80%, 16.40%, 16.20% and 13.80%), the breaking force was measured. The load cell was attached to a vertical frame to facilitate axial compression of the grains. The measured breaking force was checked for its dependency on the grain's thickness and moisture content. Linear regression showed that there was no significant relationship between the thickness and the force required to break the grain. But the observed correlation between the moisture content of the grain and the force that cracked it was high enough to conclude that amount of force needed to break the grain was dependent on the moisture content. Axial force analysis on the load cell in the determination of the compressive characteristic of rough rice revealed that it was very large to be used in this specific study with a computed factor of safety of 86.6. Having a good strain gage amplifier, the use of this large load cell was made possible. With the high correlation between moisture content and compressive failure of rough rice, using a load cell and strain gage amplifier combination could produce another secondary method of moisture content determination of rice.
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