谷粒的热—湿应力分析  

Thermo-Hydro Stress Analysis of Grain Kernels

作　　者：付志一[1] 华云龙[1] 

机构地区：[1]中国农业大学东区,北京100083

出　　处：《应用力学学报》2001年第2期94-97,共4页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金资助项目 (批准号 :196 72 0 10 )

摘　　要：针对谷物烘干问题 ,本文研究弹性及粘弹性圆球和椭球的热、湿应力。对圆球分析表明 ,热应力峰值远比湿应力峰值出现时间早。在假定材料为热、湿流变简单的Maxwell粘弹性体条件下 ,本文导出了圆球的热、湿应力分布公式 ,并应用有限元法研究了椭球的热、湿应力。文中以无量纲形式给出了圆球中心和表面应力随时间的变化情况 ,以及椭球中心轴向应力峰值随椭球长。On the background of grains drying, thermal and hydro stresses in sphere and ell ipsoids are studied in this paper. According to the stress analysis in sphere, it is found the peak of thermal stress appears much earlier than that of hydro stress, and the ratio of amplitudes for these two kinds of stresses is given If the material is Maxwell viscoelastic body, and thermal-hydro rheologically simple, stess distribution in sphere are obtained analytically. With finite elem ent method, thermal-hydro stresses in ellipsoids are studied too. The differen ces between elastic and viscoelastic stress are discussed.

关 键 词：圆球 椭球 粘弹性 湿应力 热应力 谷粒 烘干 

分 类 号：S226.6[农业科学—农业机械化工程]