Abstract
Primary attention is given to the following methods: method by drilling cylindrical holes (drill method) and integrated ultrasonic method using volume (longitudinal and transverse), surface, and sub-surface waves. Drill method allows determination of residual mechanical stress in small depth of material surfaces, assessing type, size, and orientation of principal stresses. For the first time, parallel studies are carried out of mechanical stress in materials using the electroacoustic effect of volume, surface and sub-surface waves on the one hand, and effective mechanical stresses on the other. The experimental results present electroacoustic coefficients for different types of waves in the material of gas pipeline tube of 243 mm diameter and 14 mm thickness. These are used to evaluate mechanical stresses in pipelines, according to active GOST standards.
Highlights
Scientific researches and their practical use has contributed to create a significant number of effective methods for assessing mechanical stresses based on dependencies between residual and effective stresses in material and certain physical characteristics
Complex investigations were carried out using volumetric, surface and subsurface ultrasonic waves for the evaluation of mechanical stress condition (MSC) in pipeline, and examinations by the semi-destructive “drill method”
The aim is to propose an algorithm to estimate the relative variation of MSC in surface and sub-surface layers of pipeline material, as well as the relative variation of MSC in material for the whole pipeline wall thickness
Summary
Scientific researches and their practical use has contributed to create a significant number of effective methods for assessing mechanical stresses based on dependencies between residual and effective stresses in material and certain physical characteristics (coercive force, magnetic memory, magnetic noise, propagation velocity of ultrasound waves, X-ray diffraction, etc.). There are a number of semi-destructive methods, among which the so-called “drill method”, is successfully applied [7, 8]. Complex investigations were carried out using volumetric, surface and subsurface ultrasonic waves for the evaluation of mechanical stress condition (MSC) in pipeline, and examinations by the semi-destructive “drill method”. The main task in studying the MSC of pipelines is to determine axial z and tangential (along the circumference) h mechanical stresses. The aim is to propose an algorithm to estimate the relative variation of MSC in surface and sub-surface layers of pipeline material, as well as the relative variation of MSC in material for the whole pipeline wall thickness
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