Abstract
Impact breakage is one of the main cause of rice injury during harvest and processing. In this work, the effect of impact velocity on breakage probability and modes of rice is studied by experiments. Furthermore, the impact process of rice is simulated by finite element method. The results indicate that the breakage of rice is closely related to the impact velocity. The initiation and propagation of the single meridian crack is one of the important mechanisms leading to rice breaking. A conical region is formed below the contact region when the rice is hit at high velocity. The multiple oblique meridian cracks with irregular propagation are produced under the effect of high tensile stress at the edge of region. Meanwhile, a mathematical model can describe the relationship between impact velocity and breakage probability well. These findings provide a basis for reducing the loss of agricultural products in harvest and processing.
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