EXPERIMENTAL IDENTIFICATION OF THE MEASURE OF INTERNAL FRICTION IN PLATES WITH A TWO-DIMENSIONAL AUXETIC STRUCTURE
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Abstract
The analysis of relaxation processes occurring in metals, alloys and composites is an important problem of modern materials science. This paper presents the results of experiments to determine the measure of internal friction by impulse excitation technique (IET) in samples with different two-dimensional auxetic structures, namely, tetrachiral and re-entrant. IET is an advanced method for measuring material characteristics such as dynamic elastic and shear moduli, dynamic Poisson's ratio and internal friction to study deformation, softening, relaxation mechanisms and phase transformations in various materials. In the present research, five series of specimens of each structure have been made from photopolymer resin by sterlitography technology, which differ from each other in relative density. According to the test results, the dependence of internal friction on the sample density was determined. From the analysis of the obtained data, it was found that the re-entrant structure has a higher measure of internal friction, which indicates more pronounced viscoelastic properties, which in turn means a greater ability of the re-entrant structure to dampen the energy generated by the dynamic excitation. The values of the internal friction measure for the re-entrant structure at the peak point exceed the similar values for the tetrachiral structure by a factor of 6.44, in so doing with the increase in the relative density of the structure, the measure of the internal friction decreases irrespective of the type of the considered structures.
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