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Том 52, № 9 (2016)
- Год: 2016
- Статей: 8
- URL: https://bakhtiniada.ru/1061-8309/issue/view/11288
X-Ray Methods
State-of-the art and development prospects of digital radiography systems for nondestructive testing, evaluation, and inspection of objects: a review
Аннотация
A review of modern state and practical applications of various digital radiography systems that are intended for nondestructive testing, evaluation, and inspection of objects is presented. The mainstream trends of development are described.
492-503
504-511
Acoustic Methods
Factors affecting attenuation of torsional waves in pipes loaded on contact viscoelastic media
Аннотация
Results of theoretical and experimental studies of the attenuation of torsional waves in pipes depending on the conditions of loading on viscoelastic media, pipe dimensions, and excitation frequency are presented. The results can be used for justification of pipe testing parameters such as insonification range and sensitivity when developing guided-wave techniques for pipelines of different sizes under various service conditions.
485-491
Electromagnetic Methods
Nondestructive testing of the quality of winding impregnation in electric machines
Аннотация
The topicality of this work is accounted for by a need to upgrade the evaluation of the quality of winding impregnation in electric machines and to raise their safety margin and reliability. Our goal is to substantiate the possibility of using the measured capacitance of the winding of an electric machine (with respect to its magnetic core) for testing the impregnation of cavities in the major insulation and assessing metrological characteristics of the proposed testing technique. Methods of electric measurements for studying the capacitance characteristics of electric-machine windings, formulae for calculating the dielectric constant of binary mixtures, and techniques for assessing the errors of indirect measurements have been used.
512-519
Studying the possibilities of georadar tomography in searching for air cavities in engineering constructions
Аннотация
Possibilities of a tomographic version of the georadar method of searching for air cavities in engineering constructions and estimating cavity sizes are considered. Cavity sizes vary from 10 to 70 cm. Results of mathematical modeling and in-situ measurements for a pillar with a known structure are provided in order to verify the results of calculations. It is shown that the problem of searching for and outlining cavities in engineering constructions can be successfully solved with georadar tomography. Despite high labor expenditures that are involved in the method of tomographic raying, the results are of a higher quality and reliability than the results of traditional georadiolocation with a combined source–receiver.
520-527
Thermal Methods
Determining the lateral size of subsurface defects during active thermal nondestructive testing
Аннотация
A practical implementation of a technique for determining the lateral size of subsurface defects by analyzing the spatial temperature derivative is described. The technique is illustrated by inspecting a graphite epoxy composite sample that contains an impact-damage defect.
528-531
General Problems of Nondestructive Testing
Using nondestructive testing methods for in-production quality control of additive manufactured parts
Аннотация
Peculiarities of additive technologies are considered, and the most typical flaws are listed. The possibility of layer-by-layer nondestructive testing of parts immediately in the course of additive manufacturing is demonstrated. Based on the review of domestic and international publications, possibilities that are offered by various physical methods of nondestructive evaluation are analyzed and potential of their usage is reviewed.
532-537
Erratum
Erratum to: “Thermal nondestructive testing of thermal-barrier coatings of turbine buckets”
538-538