论文标题
剪切粒状物质的磁共振成像研究
Magnetic Resonance Imaging study of sheared granular matter
论文作者
论文摘要
我们引入了一种磁共振成像技术，以研究柔软，低效率和硬摩擦颗粒材料及其混合物的剪切带的几何形状。水凝胶球充当柔软的低效率材料成分，而芥末种子则代表刚性的，摩擦的晶粒。一些水凝胶球掺有cuso4盐，以用作示踪剂。使用粒子成像速度仪，从连续的剪切步骤后的断层图确定剪切剪切细胞，并根据层次图的差异确定剪切曲线。我们发现，剪切区的几何形状在水中的软晶粒和没有嵌入流体的相同材料中的软晶粒之间有很大不同。
We introduce a Magnetic Resonance Imaging technique to study the geometry of shear zones of soft, low-frictional and hard, frictional granular materials and their mixtures. Hydrogel spheres serve as the soft, low-frictional material component, while mustard seeds represent rigid, frictional grains. Some of the hydrogel spheres are doped with CuSO4 salt to serve as tracers. A split-bottom shear cell is sheared stepwise and the shear profiles are determined from the differences of tomograms after successive shear steps, using Particle Imaging Velocimetry.We find that the shear zone geometry differs considerably between soft grains submersed in water and the same material without the embedding fluid.
