颗粒物质细观结构演化的实验研究  

MESO - SCALE EXPERIMENTAL STUDY OF GRANULAR MATTER MOTION

作　　者：高霞[1] 袁明波[1] 

机构地区：[1]山东电子职业技术学院自动化工程系,济南250200

出　　处：《山东师范大学学报（自然科学版）》2015年第3期104-106,111,共4页Journal of Shandong Normal University(Natural Science)

摘　　要：利用清华大学水利系研发的两通道微机控制压缩光弹试验机，分析了颗粒体系在轴向加载条件下，颗粒位移场及其梯度场和应力变化，结果表明宏观应力的陡降是局部颗粒的微小调整引起的，颗粒体系变形局部化对应着位移梯度大的区域，这些结果对于认识颗粒体系细观结构演化规律提供了实验支持。By using the photo - elastic technique,a two - dimensional granular system composed of round disks is compressed uniaxially. The displacement field and its gradient are analyzed by meaning of image recognition. It was found that the stress drop is resulted in particle rearrangement in local area,and the phenomena of localization corresponds to large displacement gradient area. This result sheds insight into the mesoscopic structure evolution and its links to macroscopic properties in granular materials.

关 键 词：颗粒物质 位移场 剪切带 

分 类 号：O469[理学—凝聚态物理]