龙眼鲜果剥壳力学特性

Mechanical properties of fresh longan hulling

该研究试验测定龙眼鲜果的力学特性。对龙眼鲜果的压缩试验结果表明,其抗挤压能力,在各方向上具有良好的一致性,可以将其简化为各向同性、厚度均匀的薄壳球体;基于薄壳理论的分析结果表明,采用一对法向集中力,有利于龙眼果壳的均匀破裂;在对果壳进行拉伸试验过程中发现,龙眼果实沿纵向和横向的结合力都大于蒂部,由此可以推断,采用对辊摩擦法可以实现龙眼鲜果壳的剥离,为设计龙眼鲜果剥壳去核机械提供了重要依据。

The mechanical properties of fresh longan was determined in this paper.The results of compression tests showed that the anti-extrusion capacity of fresh longan had good consistency in different directions,and it can be simplified as shell sphere,which was isotropy and uniform thickness.The analysis results based on thin shell theory indicated that using a pair normal concentrated force were benefical to equable cracking of the hulls of longan.During the tensile test on hulls,we found that the bonding force of longan fruit along longitudinal and transversal were all bigger than the pedicel.So one can see inference,the hulls of fresh longan can be peelled off by using roller friction,which provides vital basis for designing of the denucleating and shucking machine.