Abstract
The paper presents experimental values of lateral and extension transmission ultrasonic waves speed and their absorbance coefficient obtained with the help of discrete immersed method in metal filled polymer auxetic samples with polyurethane matrix. Poisson’s ratio, real and imaginary parts of complex dynamic elastic modulus (Young’s modulus, shear modulus, bulk modulus) and mechanical losses tangent of angle for extension, lateral and bulk deformation have been calculated regarding paper’s results. Viscoelastic properties of polyurethane auxetic have been examined regarding different theoretical approaches. To support negative values of Poisson’s ratio, a filled polymer model with critical filler amount and auxetic deformation models have been used. Models structural characteristics for filled polyurethane auxetics have been defined. Systems modeling with solid bulky inclusions, that are able to absorb and to disseminate ultrasonic waves, enables to consider suchlike systems as complex density materials. It is shown that in certain ratio of wave parameters and environment structural and mechanical properties, resonance effects take place, regarding filler’s particles vibration as inclusions in general.
Highlights
Nowadays researches are highly interested in methods that enable to increase operation properties of traditional materials by creating structures that possess nonlinear and abnormal distortion properties, up to the point of obtaining adaptive physical reaction of the materials to the external influence [1]
Research paper [2], to be precise, presents materials’ overview that can be considered as natural, polymer, composite and textile auxetics; investigates their structural properties according to geometric approach as well as their reaction and behavior in physics fields of force
Real (E, ) and imaginary parts (E, ) of complex modulus were calculated according to the ratios: E
Summary
Nowadays researches are highly interested in methods that enable to increase operation properties of traditional materials by creating structures that possess nonlinear and abnormal distortion properties, up to the point of obtaining adaptive physical reaction of the materials to the external influence [1]. Research paper [2], to be precise, presents materials’ overview that can be considered as natural, polymer, composite and textile auxetics; investigates their structural properties according to geometric approach as well as their reaction and behavior in physics fields of force. Sufficient progress in modeling auxetic properties and structure of polymer systems with negative Poisson’s ratio has been achieved in last few years [17,18,19]. Investigations of various polyurethane auxetics as a result of different experimental approaches [24, 25] demonstrate that for such systems Poisson’s ratio changers in -0.1 to -1. Purpose of the paper is investigation of auxetic polyurethane composites viscoelastic properties and their treatment with reference to modeling structure formation processes
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