ABSTRACT
This chapter is devoted to a rapidly deforming, or flowing, granular material. It firstly goes over the theories and experimental data, both numerically generated and by physical tests, without specifying the range of parameters within which the rapid flow assumption is valid. The material considered consists of uniform spherical, or circular particles of the same size and identical material properties. This is a tremendous idealization of natural or man-made materials. In order to successfully apply what readers have learned to real granular materials, they must investigate the effect of non-uniformity. Furthermore, the analysis presented so far assumes a rapid flow. Given that granular materials may have a combination of particle sizes, it is common sense that upon shear, segregation will take place. Segregation is a de-mixing phenomenon that can cause problems in material processing.
