Abstract
The main objective of this work was to use ultrasonic wave values and density to analyze the elastic and physical properties of a copper-plated rod used for grounding. For this, an electronic ultrasound system with 2 MHz piezoelectric transducers and mathematical models that are a function of the propagation speeds of the ultrasonic waves was used. The ultrasonic speeds were determined with the transmission method using petroleum jelly paste as the couplant material. Thus, through the specific equations for isotropic materials, it was possible to estimate some elastic properties, such as modulus of elasticity, shear and compressibility, Poisson coefficient and anisotropy factor, in addition to the physical property of acoustic impedance. The properties of the grounding rod were evaluated before and after a chemical attack with nitric acid to remove the copper layer. As a result, the feasibility of using ultrasound as a non-destructive technique, capable of detecting small changes in the properties of the nail after chemical attack, was verified. The results were compared with the electrical resistivity test and discussed as a function of the values of physical and mechanical properties reported in the literature for the grounding rods.
Published Version
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