摘要
当前对KUNZE湿应力模式的分析有两种模式:一种是基于最大拉应力与裂纹形成的高度相关性,一种则是从吸湿裂纹敏感性与谷粒中存在的微裂纹大小的相关性考虑,两种机制各有适用之处。研究了两种裂纹生成机制随吸湿时间的变化规律,并分析了不同热力学条件下垩白对裂纹生成与扩展的影响,结果表明:稻谷吸湿过程的前期,拉应力机制处于主导裂纹生成的地位,吸湿后期,微裂纹机制处于主导地位,两者间存在一个过渡阶段,在过渡阶段,所有影响因素的作用均会被削弱。
There are two modes on analysis of KUNZE stress theory.One is based on the highly correlation between maximum tensile stress and crack formation,another takes it into account that the sensitivity of cracking due to moisture adsorption is related to the magnitude of the micro-cracks in paddy kernel.In this paper,change of the mechanisms of crack formation with moisture-adsorption time was studied,and the effect of chalkiness on fissuring of milled rice,in various thermodynamics environments of humid atmosphere,was also determined.The result showed that at the early stage of the process of crack formation and propagation,tensile stress mechanism was in the leading position,while the mechanism of micro-cracks dominates later after adsorpting moisture,there was a transition phase between them,in which the role of all factors will be weakened.
出处
《粮食储藏》
2011年第1期30-35,共6页
Grain Storage
基金
江苏省高技术研究计划农产品加工领域项目:"稻米绿色储运保鲜新技术研究"(编号:BE2008396)
国家"十一五"科技支撑计划课题:"稻谷收获集约化干燥技术和设备研发与示范"(编号:2009BAD0B03)
关键词
稻谷
吸湿裂纹
拉应力
微裂纹
热力学条件
垩白
paddy
moisture-adsorption crack
tensile stress
micro-cracks
thermodynamics environments
chalkiness
