Читать книгу The Rheology Handbook - Thomas Mezger - Страница 223

In general, when a material is forced to flow, a certain relative motion occurs between its components (molecules, particles, superstructures). Therefore, a process is taking place which is always combined with internal friction, leading to the so-called viscous heating . The proportion of the deformation energy used up by the material during the shear process corresponds to the permanently remaining changes in the internal structure. Of course, this consumed portion is no longer available, e. g. for a complete reformation process after all. A part of the produced friction heat may heat up the sample itself, and another part may be conducted to the outside, being therefore lost (dissipated) for the sample, e. g. heating up the environment then (see also Chapter 2.3.1b).