COMPRESSIONAL BEHAVIOUR OF FIBRE ASSEMBLIES

(PART I) ASPECTS ON COMPRESSIONAL BEHAVIOURES CHARACTERISED BY INNER-FRICTION

Abstract

The paper describes some experimental results of frictional effects on the compression process of fibre assemblies.
(1) The external pressure required to compress the web-like assemblies is dependent on the mass of web per unit area, so that apparent compressibility K is decreased as mass of assemblies m is increased: K=K₀(1-αm) where K₀ is elastic compressibility, α is proportional constant given by friction. (see Fig. 5)
(2) When upper surface of assemblies, initial height of H₀, is compressed by constant speed V₀, the rate of inner layer compression V is deviated by the distance from surface (H₀-H). Experimentally it is held that the relation between V/V₀=ν and H/H₀=h is 1-ν/h=a(l-h), where a is proportional constant depended on inter-fibre friction. (see Fig. 7)
(3) Experimental measurements made on the coefficient of withdrawal friction μ are found to conform reasonably well with the theoretical assumptions, so it may be concluded that parameters α and a are determined by inner frictional effect of compressed assemblies. (see Table 1)