CHARACTERIZATION AND ANALYSIS OF STATIC MECHANICAL PROPERTIES OF RICE

In order to explore the mechanical properties of rice,the compressing force (CF),shear fracture force (SFF) and three point bending force (TPBF) mechanical characteristics of rough-rice,brown-rice and milled rice were tested and analyzed by using texture analyzer with 10 kinds of japonica and indica paddy as raw material.The results showed that the force-time curve of rough rice kernel under compressive loading had a peak before the kernel was completely broken,because the brown-rice was broken first.Under the three-point and shearing loading,the break of these three kernels were all originated from the internal creaks.The existence of husk and bran of japonica paddy weakened the CF difference of rice varieties,while the husk of indica paddy weakened the CF difference of rice varieties.The husk of japonica paddy had a greater influence on weakening the SFF difference of rice varieties than the bran.The bran of indica paddy had a greater influence on weakening the SFF difference of rice varieties than the husk.The husks of the two paddies both weaken the TPBF difference of rice varieties.The compressive and shear properties of japonica and indica paddy were all in the sequence of compression force >shear fracture force >three-point bending force,and compression energy >shear fracture energy >three-point bending energy.