Improving the economic and operational reliability of the designed structures by improving the acoustic methods for diagnosing invisible material microdefects

Abstract

AnnotationThe study aimed at increasing the economic and operational reliability of various designed building structures, improving non-destructive acoustic methods for detecting hidden microdefects in the materials used has been carried out. Construction, water, oil, gas pipelines must have the strength to ensure the trouble-free operation during the entire period of their operation, which determines the economic and operational reliability of structures. Strength can be significantly reduced if the latent microdefects are available in the material. In the field of such structural disturbances, material destruction, leading to loss of stability and bearing capacity of structural elements, accompanied by huge economic losses, environmental degradation and, in the worst case, human losses can develop. Therefore, it is necessary to improve the non-destructive acoustic methods for detecting latent microdefects. The mathematically refined models that describe the propagation of nonlinear deformation waves in thin-walled structural elements should be constructed for this. This is possible if the real physical and mechanical parameters, leading to more accurate characteristics of the deformation waves required for acoustic methods of the materials’ defectoscopy are taken into account. Such models include nonlinear mathematical models describing the propagation of deformation waves in rods and cylindrical shells, when the real hereditary properties of the material, the possibility of developing large deformations in them, and the effects lost in the framework of models that consider only the linearly elastic properties of structural elements are taken into account. Such a simplification causes unacceptable errors in the calculation of wave parameters and, accordingly, gives far-from-truth results of an acoustic study of the presence of invisible microdefects in the material of thin-walled structural elements that weaken their strength, and the economic and operational reliability of the designed structures and pipelines depends on it.