Estudo da interação das linhas de campo sobre uma amostra de aço SAE 1020 por meio de medidas de tensão hall.

Abstract

Nondestructive tests aim at analyzing the existence of discontinuities or faults in materials, parts or structures. These tests are performed using physical principles defined without altering the physical, chemical and dimensional properties of them. In the present study it was evaluated the potentialities of using hall effect sensors in order to analyze the behavior of the magnetic flux density and its interaction with a ferromagnetic material. SAE 1020 Steel samples with different geometries were used to determine the effect of dimensions in relation to the density of the magnetic field applied to the part to be tested. The geometry effect was also evaluated through simulations using the Finite Element Method. The results show that from the geometry studied there is a thickness value from which measures the density of field lines become independent of it. According to the simulations results, comparing them to the experimental data, it was observed that the minor errors values were obtained for the density of distant field values that lead to the saturation point of the sensor.