On the Specific Features of Using the Phenomenon of Acoustoelasticity When Testing the Stress State of Anisotropic Material of Technical Objects at Subzero Temperatures

Abstract

Abstract The relevance of this work is due to the need to create methods for determining the stress-strain state of acoustically anisotropic structural materials as part of technical objects operated in Arctic conditions. The specific features of using the phenomenon of acoustoelasticity for materials with different values of acoustoelastic coefficients, acoustic anisotropy, and coefficients of temperature dependence of acoustic parameters that appear in the design algorithms are analyzed. It has been established that the existing approaches to the consideration of the temperature effects in a number of crucial cases lead to noticeable errors in determining the mechanical stresses in the material of critical technical objects. In this case, consideration of the temperature corrections is necessary for both biaxial (plane) and uniaxial stress states. The presence of anisotropy in the thermoacoustic coefficients of transverse waves for materials with anisotropy has been shown experimentally. The adjusted design formulas for determining the uniaxial and biaxial stress state of an anisotropic material with the anisotropy of the thermoacoustic coefficients of shear waves taken into account are proposed.