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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">pimi</journal-id><journal-title-group><journal-title xml:lang="ru">Приборы и методы измерений</journal-title><trans-title-group xml:lang="en"><trans-title>Devices and Methods of Measurements</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2220-9506</issn><issn pub-type="epub">2414-0473</issn><publisher><publisher-name>BNTU</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.21122/2220-9506-2019-10-4-360-372</article-id><article-id custom-type="elpub" pub-id-type="custom">pimi-568</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>Методы измерений, контроля, диагностики</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>Methods of measurements, monitoring, diagnostics</subject></subj-group></article-categories><title-group><article-title>Pассеяние упругих волн неоднородной границей при акустическом контроле неразъёмных соединений</article-title><trans-title-group xml:lang="en"><trans-title>Scattering of Elastic Waves by an Inhomogeneous Boundary in the Acoustic Testing of Permanent Joints</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Баев</surname><given-names>А. Р.</given-names></name><name name-style="western" xml:lang="en"><surname>Baev</surname><given-names>A. R.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Адрес для переписки: А.Р. Баев – Ин-т прикладной физики Национальной академии наук Беларуси, ул. Академическая, 16, г. Минск 220072, Беларусь     e-mail: baev@iaph.bas-net.by</p></bio><bio xml:lang="en"><p>Address for correspondence: A.R. Baev – Institute of Applied Physics of the National Academy of Science of Belarus, Akademicheskaya str., 16, Minsk 220072, Belarus      e-mail: baev@iaph.bas-net.by</p></bio><email xlink:type="simple">baev@iaph.bas-net.by</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Левкович</surname><given-names>Н. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Levkovich</surname><given-names>N. V.</given-names></name></name-alternatives><bio xml:lang="ru"/><bio xml:lang="en"/><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Майоров</surname><given-names>А. Л.</given-names></name><name name-style="western" xml:lang="en"><surname>Mayorov</surname><given-names>A. L.</given-names></name></name-alternatives><bio xml:lang="ru"/><bio xml:lang="en"/><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Асадчая</surname><given-names>М. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Asadchaya</surname><given-names>M. V.</given-names></name></name-alternatives><bio xml:lang="ru"/><bio xml:lang="en"/><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Институт прикладной физики Национальной академии наук Беларуси</institution><country>Беларусь</country></aff><aff xml:lang="en"><institution>Institute of Applied Physics of the National Academy of Science of Belarus</institution><country>Belarus</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>2Белорусский государственный университет</institution><country>Беларусь</country></aff><aff xml:lang="en"><institution>Belarusian State Univercity</institution><country>Belarus</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2019</year></pub-date><pub-date pub-type="epub"><day>12</day><month>12</month><year>2019</year></pub-date><volume>10</volume><issue>4</issue><fpage>360</fpage><lpage>372</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Баев А.Р., Левкович Н.В., Майоров А.Л., Асадчая М.В., 2019</copyright-statement><copyright-year>2019</copyright-year><copyright-holder xml:lang="ru">Баев А.Р., Левкович Н.В., Майоров А.Л., Асадчая М.В.</copyright-holder><copyright-holder xml:lang="en">Baev A.R., Levkovich N.V., Mayorov A.L., Asadchaya M.V.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://pimi.bntu.by/jour/article/view/568">https://pimi.bntu.by/jour/article/view/568</self-uri><abstract><p>Повышение надёжности и производительности контроля неразъёмных соединений различных материалов, выполненных сваркой, напылением, склеиванием, пайкой и другими методами, является важной производственной задачей, для решения которой наиболее простым и эффективным является акустический метод. Цель работы заключалась в расширении технических возможностей и повышении чувствительности акустического контроля дефектов сцепления материалов на основе установления закономерностей формирования поля рассеяния упругих волн от неоднородной границы в трёхмерном пространстве и выдаче рекомендаций для разработки методик контроля таких объектов. Впервые в рамках классических представлений проведён расчёт полей и анализ полей рассеяния падающего акустического луча с круглым поперечным сечением, перемещаемого через границу полубесконечного дефекта. В качестве важного параметра дефекта неразъёмного соединения предлагается использовать фазовый сдвиг между отражёнными от указанных поверхностей волнами, варьируемый в диапазоне π/4–π. Он оказывает существенное влияние на диаграмму направленности поля и её угловые экстремумы – минимумы и максимумы разных порядков при перемещении границы дефекта относительно центра пятна акустического луча.</p><p>Установлены особенности эволюции структуры поля рассеяния, позволяющие выявить оптимальные условия для обнаружения слабо отражающих звук дефектов. Показана принципиальная возможность оценки площади дефекта (дефектов) по данным изменения амплитуды первичного максимума диаграммы направленности поля рассеяния. Представленные экспериментальные данные находятся в хорошем качественном соответствии с расчётными данными.</p><p>На конкретных примерах показана эффективность использования предложенного метода для ряда практических приложений.</p></abstract><trans-abstract xml:lang="en"><p>Improving the reliability and testing performance of permanent joints оf different materials made by welding, spraying, gluing, soldering and other methods is an important production task, for which the ultrasonic method is the simplest and most effective. The purpose of this work was to expand the technical possibilities and increase the sensitivity of ultrasonic testing of adhesion defects of materials joints based on the establishment of laws governing the formation of a scattering field of elastic waves from an inhomogeneous boundary in three-dimensional space and issuing recommendations for the development of suggested method.</p><p>For the first time, in the framework of classical concepts, the scattering fields of elastic waves of an acoustic beam with a circular cross section moving across the boundary of a semi-infinite defect are calculated. It is proposed to use a phase shift between the waves reflected from the indicated surfaces, which varies in the range of π/4–π, as an important parameter of the material joint's defect. It has a significant effect on the field pattern and its angular amplitude extrema — minima and maxima of different orders when the defect boundary is moved relative to the center of the acoustic beam spot.</p><p>The features of the evolution of the structure of the scattering field are established, which make it possible to identify optimal conditions for the detection of weakly reflective defects in sound. It is shown that it is possible in principle to estimate the defect's area by measuring a change in the amplitude of the primary maximum of the radiation pattern of the scattered waves.</p><p>Specific examples show the effectiveness of using the proposed method for a number of practical applications.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>диаграмма направленности</kwd><kwd>неразъёмное соединение</kwd><kwd>рассеяние упругих волн</kwd></kwd-group><kwd-group xml:lang="en"><kwd>radiation pattern</kwd><kwd>one-piece connection</kwd><kwd>scattering of elastic waves</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Настоящая работа выполнена при поддержке Белорусского республиканского фонда фундаментальных исследований, проект Т19-136 от 02.05.2019 г.</funding-statement><funding-statement xml:lang="en">This work was carried out with the support of the Belarusian Republican Fund of fundamental investigations within the bounds of contract No. Т19-136 of 02.05.2019.</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Неразрушающий контроль: Справочник: в 7 т. / Под общ. ред. 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