农业工程学报2011，Vol.27Issue(8)：360,362-364,4.DOI:10.3969/j.issn.1002-6819.2011.08.063
荔枝鲜果挤压力学特性
Extrusion mechanical properties of fresh litchi
摘要
Abstract
In order to reduce the mechanical damage of litchi in harvesting, storage and transportation, and provide the design basis for operation equipment, the geometric characteristics of fresh litchi were determined in this paper, the extrusion tests were conducted for litchi under different loading conditions. Moreover, tensile tests were carried out for the hulls of fresh litchi. The rupture force of cultivar Feizixiao and Guiwei were 76.46-112.90 N and 38.67-53.83 N under five loading rates and two loading directions, while the relative deformation were 27.93%-32.57% and 18.87%-21.27%, and the elastic modulus were 2.52-4.69 ×105 Pa and 4.26-5.93 × 105 Pa. The results of tests showed that the anti-extrusion capacity of litchi fruit was anisotropic and was stronger in the vertical direction than in horizontal direction. The anisotropy of cultivar Feizixiao was more significant than Guiwei, and its anti-extrusion capacity was also greater than Guiwei. The loading rate in this experiment had no significant anti-extrusion capacity. Therefore, litchi fruit can be simplified as uniform thickness shell sphere, and its stone was elongated ellipsoid. According to simplified structure and anisotropy of hulls, the mechanical principle of extrusion properties and cracking characteristics were analyzed. The results can provide a theoretical basis for litchi harvesting, processing and transporting.关键词
挤压/力学特性/果壳/品种/荔枝鲜果Key words
extrusion/mechanical properties/hulls/cultivar/fresh litchi fruit分类
农业科技引用本文复制引用
陈燕,蔡伟亮,邹湘军,向和平..荔枝鲜果挤压力学特性[J].农业工程学报,2011,27(8):360,362-364,4.基金项目
国家星火计划(2010GA780049) （2010GA780049）
国家自然科学基金资助项目(30900870):广东省自然科学基金资助项目(9251064201000009) （30900870）
华南农业大学校长基金资助项目(2009X004) （2009X004）
