摘要
利用回弹模量仪对小麦堆(河南产)(水分为11.7%,13.33%,15.18%,16.55%,18.18%w.b)的密度和无侧向膨胀压缩体变模量进行了实验测定,实验选定加在样品顶部的压应力为:50 kPa、100 kPa、150 kPa、200 kPa、250 kPa、300 kPa,通过计算得出对应的样品平均竖直压应力为:36.8 kPa、74.8 kPa、110.9 kPa、153.4 kPa、184.7 kPa、221.0 kPa。进而得到样品所受的平均压应力为:18.3 kPa、41.9 kPa、66.7kPa、91.0 kPa、110.9 kPa、133.248 kPa。实验结果表明:在同一水分下,随着平均压应力的增大,小麦堆的密度也增大。在同一水分下,随着平均压应力的增大,小麦堆的体变模量也增大。拟合方程为y=axb,其中参数a、b随水分的不同而变化。
At the moisture content of 11.7%,13.33%,15.18%,16.55%,18.18% w.b,the density and bulk modulus of the wheat pile were measured by modulus of resilience meter.The relationship of the vertical and the average compression stress in the absence of lateral expansion was investigated and the values of the average compression stress were obtained by running the program.The values of the average vertical compression stress are 36.8kpa,74.8kpa,110.9kpa,153.4kpa,184.7kpa,221.0kpa.And the values of the average compression stress are 18.3kpa,41.9kpa,66.7kpa,91.0kpa,110.9kpa,133.248kpa.The results showed that the density of the wheat pile increase exponentially with the increase of the average compression stress in the same moisture content.In the same moisture content,an increase in average compression stress yields a exponential increase in the bulk modulus of wheat pile.The equation fitted is y=axb,where the parameters of a and b altered with the moisture content.
出处
《粮食储藏》
2011年第4期33-37,共5页
Grain Storage
基金
"十一五"国家科技支撑计划项目(项目编号:2009BADA0B04-5)
南京财经大学科研基金项目(项目编号:A2010025)
关键词
竖直压应力
密度
体变模量
the vertical compression stress
density
the bulk modulus
