不同条件下颗粒物质的粘弹性响应  

Viscoelastic response of pressurized granular materials

作　　者：胡林[1] 周鲁卫[1] 

机构地区：[1]复旦大学应用表面物理国家重点实验室

出　　处：《物理实验》2005年第1期13-16,共4页Physics Experimentation

基　　金：国家自然科学基金(No.10374021);贵州省组织部高科技人才基金;贵州省科委(No.20043016)资助项目

摘　　要：研制了能承受100 MPa压强的测量装置,并用该装置对加压下制备的紧密沙堆进行粘弹性响应测量,得到球形镍颗粒沙堆在周期性竖直振荡下储能模量G′与压强p的关系. 实验结果表明,反映沙堆整体弹性特征的储能模量G′与压强p的关系为G′～p0.45;不同形状颗粒体系的粘弹性响应行为不同.The device that can endure 100 MPa is developed, and by using it the viscoelastic response of pressurized granular materials is studied. The relation of the storage modulus G′ and pressure p of the compressed granular assemblies consisting of spherical nickel beads is obtained under a periodical vertical excitation. The experiment demonstrates that the storage modulus G′ of the whole granules’ elasticity character changes with compressing pressure p: G′~p 0.45, and also shows that the compressed granular materials in different shapes have different viscoelastic response behaviors to pressure.

关 键 词：颗粒物质 粘弹性 压强 

分 类 号：O345[理学—固体力学]