Читать книгу The Rheology Handbook - Thomas Mezger - Страница 101

Solids or dispersions with a high concentration of solids showing high interactive and cohesive forces; i. e. plasticine (see Experiment 1.1b of Chapter 1.2), wax, a piece of soap, sealants, sludge, loam, mocha coffee grounds, plasters, surfactant, systems showing shear-banding (see Chapter 9.2.2).

When performing rheological experiments in a scientific sense, however, it is assumed that there are homogeneous shear conditions across the entire shear gap. Only then, a constant shear rate or shear deformation can be expected to occur during the whole shearing process and after removing the load, and viscous, viscoelastic or elastic behavior. And only under these preconditions, the behavior can be described formally and mathematically by the relations according to Newton, Hooke, Maxwell, Kelvin/Voigt and Burgers.