BI-AXIAL STRESS QUANTITATIVE EVALUATION WITH BARKHAUSEN NOISE: THE PAST AND PERSPECTIVES

摘要

Residual and applied stress evaluation in the design and exploited structures is one of the key problem which gives the opportunity to predict remaining life, optimize engineering process and avoid failure. The present article is the elaboration of biaxial stress quantitative investigation with the help of Barkhausen noise (BN), the last appears to have many advantages. The main disadvantage of conventional approaches consists in the assumption that the main restrictions known for stress and deformation values, like relations between deviator and spherical stress tensor parts are baselessly spread to the similar components of measured magnetic parameters values. This yields additional uncertainty to the bi-axial stress measurement via magnetic parameters. Two specific arrangements for bi-axial experiments by compression-tension and bending respectively have been designed, which provided for accurate simultaneous measurement of deformation values along with magnetic values at the cross-like steel specimens. That gave the opportunity to plot different combinations of principal BN components over deviator and spherical stress tensor parts, their relations and von Mises deformations respectively. This helped to determine important patterns for the relations between these properties, which can be successfully used for the interpretation of bi-axial stress measurements in practical applications.