【摘要】 水稻谷粒的损伤与破碎除与其所受内、外力的作用有关,还与其本身的力学性能有关。通过对水稻谷粒的挤压力学试验,测得了其力-位移曲线,分析了水稻谷粒的挤压破碎过程。破坏力和破坏能是水稻谷粒力学特性的两个重要指标。试验研究了稻谷的品种、成熟程度、后熟作用和谷壳对水稻谷粒力学性能的影响。比较了有壳、无壳谷粒的破坏力与破坏能,分析了谷壳对谷粒力-位移曲线及刚度的影响。指出谷壳在降低谷粒收获、加工、储运中的损伤程度具有重要作用。更多还原

【Abstract】 Besides internal and external stress, the injury to rice grains is concerned with mechanical properties. In this paper, the force-deformation curve of rice grains was measured by the compression test. Some phenomena that occurred in the compression test were described. Compression failure force and compression failure energy are two important indexes to the mechanical properties of rice grains. The influence of different varieties, harvest time and after ripening action on mechanical properties of rice grain was determined respectively. The differences of mechanical properties between rice grains (with husk) and brown rice (without husk) were put forward. The significant effect of husk on reducing the injury to rice grains was shown. The mechanical parameters of rice grains can offer the base for optimization design of relevant devices.更多还原