玉米堆的压缩弹塑性实验分析  

EXPERIMENT AND ANALYSIS OF COMPRESSIVE ELASTIC-PLASTIC PROPERTIES OF MAIZE HEAP

作　　者：程绪铎[1] 石翠霞[1] 陆琳琳[1] 

机构地区：[1]南京财经大学食品科学与工程学院生态储粮实验室,南京210003

出　　处：《粮食储藏》2011年第5期15-20,共6页Grain Storage

基　　金："十一五"国家科技支撑计划项目(2009BADA0B04-5);南京财经大学科研基金项目(A2010025)

摘　　要：利用LHT-1型粮食回弹模量测定仪对玉米堆在不同条件(预压力,水分)下的无侧向膨胀回弹模量进行了实验测定,分析了不同预压力(0、100kPa、200kPa)、不同水分(13.89%、15.12%、17.71%、18.74%)对玉米堆回弹模量的影响;弹塑性形变之比与预压力的关系以及每次加卸载时塑性形变的变化规律。实验结果表明:同一水分下,玉米堆的回弹模量随着预压力的增大而增大;同一预压力下,随着水分增大,玉米堆的回弹模量减小;第五圈的弹塑性形变之比随预压力的增大而减小;每次加卸载后塑性形变随加载次数的增加而减小。LHT-1 type of grain rebound modulus instrument is used to determine the compressive elastic-plastic properties of no lateral expansion of maize heap in different conditions（pre-pressure,moisture content）.The influences of different pre-pressures（0,100,200kPa） and different moisture contents（13.89%,15.12%,17.71%,18.74%） on rebound modulus of maize heap,the relationship between the ratio of elastic-plastic deformation and pre-pressure,and the regularity for change of plastic deformation with each loading and unloading are analyzed.The results show that the rebound modulus of maize heap increase with the pre-pressure increasing at the same moisture and decrease with the moisture contents increasing at the same pressure.The ratio of elastic-plastic deformation of the fifth circle decreases with the pre-pressure increasing.Plastic deformation reduces with the times of loading and unloading raising.

关 键 词：玉米堆 回弹模量 预压力 水分 

分 类 号：S513[农业科学—作物学]