Experimental Methods for Soft Viscoelastic Solids and Liquids of High Viscosity

Experimental Methods for Soft Viscoelastic Solids and Liquids of High Viscosity 

Whether or not a given polymeric system is soft or hard depends of course on the frequency range as well as the temperature. At high frequencies and low temperatures the methods described in this chapter must be replaced by those of 

Geometries, coordinates, and dimensions for investigation of soft viscoelastic solids (in addition to those shown in Fig. 5-1). (a) simple shear sandwich (b) simple elongation (c) torsion of bar with rectangular cross-section. 

Chapter 7. Detailed reviews of experimental methods to supplement Chapters 6 and 7 may be found in the literature.  

All the experimental geometries described in the preceding chapter and illustrated in Fig. 5-1 can be used for measurements of viscoelastic properties of soft solids, though confinement of the sample between coaxial cylinders is rather un-usuaF- because of the difficulty in Hlling. In addition, three other geometries which are common are sketched in Fig. 6-1. In creep, stress relaxation, and dynamic experiments without sample inertia effects, the shear (or simple extension) strain stress ratios can be obtained from displacement/force ratios by geometrical factors which supplement the list given in Chapter 5 as follows  

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