Change in the acoustic anisotropy parameter of structural steel during fatigue failure
Authors: Sergeeva O.A., Gonchar A.V.
Published in issue: #11(119)/2021
DOI: 10.18698/2308-6033-2021-11-2125
Category: Mechanics | Chapter: Dynamics, Strength of Machines, Instruments, and Equipment
Material damages affect its microstructure, physical and acoustic properties. The article considers microstructural and ultrasonic studies of the St3sp5 steel carried out under cyclic uniaxial tension-compression in the low-cycle fatigue area. The fatigue tests were performed in stages. At each stage of cyclic deforming, the structure of steel samples was studied by the ultrasonic method and the change in the acoustic anisotropy parameter was determined. The relationship between the acoustic characteristics of the material and the degree of its damage is found. Based on the relationship the residual life can be predicted. The advantage of this method for determining the residual resource using the acoustic anisotropy parameter is that it is not required to determine the length of the acoustic path, for example, the wall thickness of the object under study. The influence of the deformation range of the cycle on the rate of the acoustic anisotropy parameter change is investigated. A direct linear relationship was established between the relative number of cycles and acoustic anisotropy parameter. An algorithm for determining the residual life of a material based on studies of microstructural changes and ultrasonic data is proposed.
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