With a newly designed uni-axial elongation equiment, elongation thickening of highly concentrated suspensions was investigated. The equipment can measure the total tensile force and the liquid-phase pressure in the suspension. This allows to analyse all network stresses, i.e. all inter-particle stresses. Fro comparing elongation and shear properties, a rotational shear rehometer was equipped with facilities to simultaneously measure viscosity, liquid-phase pressure and normal force. The critical elongation rate beyond which dilatancy occurs is about a factor 30 lower than the corresponding shear equivalent. Especially in elongation and also in shear, the liquid phase pressure of the suspension decreases beyond a critical range.
|Title of host publication||Proceedings of the XIIIth international congress on rheology : Cambridge, UK, 20-25 August 2000|
|Publication status||Published - 2000|
|Event||XIIIth International Congress on Rheology - Cambridge, United Kingdom|
Duration: 20 Aug 2000 → 25 Aug 2000
|Conference||XIIIth International Congress on Rheology|
|Period||20/08/00 → 25/08/00|