The Granulosis The Flexibility And Layered

In the environment of people's living, granular matter have existed in anywhere, and have had important roles in production of agriculture and industry, so research of granular media have showed more important. In last years, research of granular media have achieved fruitful achievement. Being a kind of specially condensed state system, they represent both solid-like and liquid-like features.Their fundamentality characters have not been explained distinctly so far. For example, when size and shape of granular matter content special correlation, mechanisms of granular spontaneous stratification and segregation haven't given strict explanation, and for a static cohensionless granular material, if there are same validity of the notions of stain and elasticity for the granular material because they are based on the equilibrium thermodynamics.In this article, we investigate mechanisms of granular spontaneous stratification and segregation , we think that different inertia and different internal angle of friction during forming granular pile result in granular spontaneous stratification and segregation due to different size and shape haven't different internal angle of friction in different location ,so different granular media haven't different stability. According to princle of volume equality, the paper computed thickness of granular stratum.The paper shows that for a static cohensionless granular material simply averaging in space the strains inside grains doesn't result its macroscopic strain, so the fields of displacement vector and strain tensor don't have the property of coarse-graining. By comparing equilibroty zone of ideal solid, granular media ,liquid and inferring of elasticity by a model of simple force chain indicates the validity of the notions of stain and elastility for the granular material because they are based on the equilibrium thermodynamics.