Simple shear sandwich geometry

FIG. 6-1. 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. 

A simple illustration is shown in Fig. 6-5 an electromagnetic drive causes periodic shearing of two discs with shear sandwich geometry. The complex ratio of driving force to velocity is the same as that given in equations 21 to 23 of Chapter 5 ... 

Apart from the short beam shear test, which measures the interlaminar shear properties, many different specimen geometry and loading configurations are available in the literature for the translaminar or in-plane strength measurements. These include the losipescu shear test, the 45°]5 tensile test, the [10°] off-axis tensile test, the rail-shear tests, the cross-beam sandwich test and the thin-walled tube torsion test. Since the state of shear stress in the test areas of the specimens is seldom pure or uniform in most of these techniques, the results obtained are likely to be inconsistent. In addition to the above shear tests, the transverse tension test is another simple popular method to assess the bond quality of bulk composites. Some of these methods are more widely used than others due to their simplicity in specimen preparation and data reduction methodology. 

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