Об использовании параметров структурного шума при контроле поверхностными акустическими волнами Рэлея стали 20ГЛ в процессе упругопластического деформирования

Abstract

The relevance of the work is due to the need to create methods for determining the stress-strain state of acoustically anisotropic structural materials in the composition of technical objects operated in Arctic conditions. The features of using the acoustoelasticity phenomenon for materials with different values of acoustoelastic coefficients, acoustic anisotropy, and temperature dependence coefficients of acoustic parameters appearing in the calculation algorithms are analyzed. It is established that the existing approaches to accounting for temperature effects in a number of important cases lead to noticeable errors in determining mechanical stresses in the material of critical technical objects. At the same time, taking into account the temperature corrections is necessary for both biaxial (flat) and uniaxial stress states. The presence of anisotropy of the thermoacoustic coefficients of transverse waves for materials with anisotropy is experimentally shown. Refined calculation formulas for determining the one - and two-axis stress state of an anisotropic material, taking into account the anisotropy of the thermoacoustic coefficients of transverse waves, are proposed.