METHOD FOR ULTRASONIC TESTING OF PLANE STRESS STATE OF ACOUSTICALLY ANISOTROPIC MATERIALS AT VARIABLE TEMPERATURES Russian patent published in 2021 - IPC G01N29/04 

FIELD: material plane stress state determination.

SUBSTANCE: invention is intended to determine the plane stress state of an anisotropic material. The substance of the invention lies in the fact that the pulses of ultrasonic longitudinal and transverse waves are introduced into the loaded object and its unloaded analogue by the emitting electro-acoustic transducers, the reflected bottom pulses are received by the receiving transducers, the transit times of these pulses in the loaded and unloaded objects are measured, the changes in the delays of the transmitted pulses are determined and, from their difference, the values ​​of stresses are determined, taking into account the acoustic anisotropy by using additional acoustoelastic coefficients, and the temperature - by using thermoacoustic coefficients of the dependence of the velocities of elastic waves of various types on the temperature of the object material in the calculation algorithms. In this case, to refine the results of determining the plane stress state, the difference in thermoacoustic coefficients of transverse waves polarized along different axes of anisotropy of an anisotropic material is taken into account.

EFFECT: improving the accuracy of determining the plane stress state of acoustically anisotropic materials.

1 cl, 4 dwg