摘要
本文以3种不同稻谷米粒为研究对象,采用质构仪进行稻米的压缩实验,基于显微镜原位观测,在4种不同因素:压距、速率、温度、湿度下,研究稻米在受到压缩力时的力学-结构特性,并得到不同因素下的函数关系式。结果表明:稻米受到的压缩力随压距的增大而增大,稻米内部产生抗压应力,出现裂纹,且裂纹逐渐扩展,最后导致稻米断裂;速率对稻米的压缩力影响较小,在稻米破碎前,不同速率的峰值力呈线性变化;稻米所受的压缩力随浸泡时间的上升而减小,稻米的裂纹也会随之增加,在相同的浸泡时间内,籼米所受的峰值力会更快趋于平稳,且峰值力高于粳米和糯米;稻米的压缩力随温度的上升而减小,破坏程度随温度的上升而增大。稻米随压距和湿度的峰值力变化规律与幂函数类似,并基于幂函数进行数据拟合;随速率的峰值力规律呈线性变化,采用线性函数拟合。
In this paper,with three different rice grains as the research object,the compression experiment of rice was carried out with experimental setup based on a texture analyzer and in-situ observation microscope,and mechanics-structural characteristics of rice under compressive force were researched under four different factors:distance,speed,temperature,humidity,Experimental data of different factors were fit,and the function expression was obtained.The results showed that the rice compressive force increased with the increase of the extrusion distance,the internal compressive stress of rice was generated,and the cracks appeared,which gradually expanded and finally led to the rice fracture.The compression rate had little effect on the rice compressive force,and the peak force of different rates changed linearly before the rice was broken.The compression force of rice decreased with the soaking time increasing,and the rice crack also increased.Under the same soaking time,the peak force of indica rice tended to be stable faster and the peak force was bigger than that of japonica rice and glutinous rice.The rice compressive force decreased with the increase of temperature,and the damage degree increased with the increase of temperature.The variation of rice peak force with pressure distance and humidity is similar to the power function,and the data is fitted based on the power function.The law of peak force varies linearly with the rate and is fitted by linear function.
作者
杨柳
杨腾宇
范雨超
陈欢
王成豪
宋少云
YANG Liu;YANG Teng-yu;FAN Yu-chao;CHEN Huan;WANG Chen-hao;SONG Shao-yun(School of Mechanical Engineering,Wuhan Polytechnic University,Wuhan 430023,China)
出处
《武汉轻工大学学报》
2021年第1期47-53,共7页
Journal of Wuhan Polytechnic University
基金
武汉轻工大学博士启动科研(2019RZ08)
武汉轻工大学校杰出青年科研项目(2020J06).
关键词
稻米
压缩力
裂纹
拟合函数
rice
compressive force
crack
fitting function
