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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">powder</journal-id><journal-title-group><journal-title xml:lang="ru">Известия вузов. Порошковая металлургия и функциональные покрытия</journal-title><trans-title-group xml:lang="en"><trans-title>Powder Metallurgy аnd Functional Coatings (Izvestiya Vuzov. Poroshkovaya Metallurgiya i Funktsional'nye Pokrytiya)</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1997-308X</issn><issn pub-type="epub">2412-8767</issn><publisher><publisher-name>НИТУ "МИСИС"</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.17073/1997-308X-2022-1-57-65</article-id><article-id custom-type="elpub" pub-id-type="custom">powder-675</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>Наноструктурированные материалы и функциональные покрытия</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>Nanostructured Materials and Functional Coatings</subject></subj-group></article-categories><title-group><article-title>Трещиностойкость, прочность и динамическая усталость кварцевых волокон с медными покрытиями</article-title><trans-title-group xml:lang="en"><trans-title>Crack resistance, strength and dynamic fatigue of quartz fibers with copper coatings</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>Булатов</surname><given-names>М. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Bulatov</surname><given-names>M. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p>аспирант кафедры «Металловедение, термическая и лазерная обработка металлов»</p><p>614990, г. Пермь, Комсомольский пр-т, 29</p></bio><bio xml:lang="en"><p>postgraduate student of the Department «Metal science, heat and laser treatment of metals»</p><p>614990, Perm, Komsomolskii pr., 29</p></bio><email xlink:type="simple">BylatovMI@gmail.com</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>Шацов</surname><given-names>А. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Shatsov</surname><given-names>A. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>докт. техн. наук, проф. кафедры «Металловедение, термическая и лазерная обработка металлов»</p><p>г. Пермь</p></bio><bio xml:lang="en"><p>Dr. Sci. (Eng.), prof. of the Department «Metal science, heat and laser treatment of metals» </p><p>Perm</p></bio><email xlink:type="simple">shatsov@pstu.ru</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>Григорьев</surname><given-names>Н. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Grigoryev</surname><given-names>N. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>магистрант кафедры «Общая физика»</p><p>г. Пермь</p></bio><bio xml:lang="en"><p>undergraduate student of the Department of general physics </p><p>Perm</p></bio><email xlink:type="simple">super.nikitaperm@yandex.ru</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>Мальков</surname><given-names>Н. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Malkov</surname><given-names>N. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>магистрант кафедры «Нанотехнологии и микросистемная техника»</p><p>614068, г. Пермь, ул. Букирева, 15</p></bio><bio xml:lang="en"><p>undergraduate student of the Department of nanotechnology and microsystem technology</p><p>614068, Perm, Bukireva str., 15 </p></bio><email xlink:type="simple">nikitaandreich0@gmail.com</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Пермский национальный исследовательский политехнический университет</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Perm National Research Polytechnic University</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Пермский государственный национальный исследовательский университет</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Perm State National Research University</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2022</year></pub-date><pub-date pub-type="epub"><day>24</day><month>03</month><year>2022</year></pub-date><volume>0</volume><issue>1</issue><fpage>57</fpage><lpage>65</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; НИТУ "МИСИС", 2022</copyright-statement><copyright-year>2022</copyright-year><copyright-holder xml:lang="ru">НИТУ "МИСИС"</copyright-holder><copyright-holder xml:lang="en">НИТУ "МИСИС"</copyright-holder><license xlink:href="https://powder.misis.ru/jour/about/submissions#copyrightNotice" xlink:type="simple"><license-p>https://powder.misis.ru/jour/about/submissions#copyrightNotice</license-p></license></permissions><self-uri xlink:href="https://powder.misis.ru/jour/article/view/675">https://powder.misis.ru/jour/article/view/675</self-uri><abstract><p>Металлизированные покрытия позволяют существенно улучшить эксплуатационные свойства кварцевых волокон. Целью работы было определение трещиностойкости, прочности и динамической усталости оптических волокон без покрытия и с медными покрытиями. Микротвердость кварцевых волокон измеряли методом алмазного индентирования торцевых поверхностей. Параметр интенсивности напряжений K1c был найден из полуэмпирической зависимости А. Ниихары, геометрию отпечатка и радиальных трещин исследовали на сканирующем электронном микроскопе. Трещиностойкость кварца без покрытия оказалась почти в 3 раза меньше, чем у волокна в медном покрытии, что, полагаем, связано с аддитивным вкладом сжимающих напряжений на поверхности волокон и смачиванием кварца медью. Вытяжка оптического волокна с медным покрытием повышает предел прочности, трещиностойкость и параметр динамической усталости и является главным ресурсом сохранения эксплуатации волокна в условиях статистического подхода к конструкционной прочности. Проведены сравнительные испытания на прочность оптических волокон методами двухточечного изгиба и осевого растяжения. Результаты экспериментальных испытаний предела механической прочности кварцевых оптических волокон показали значительный разброс данных, что свидетельствует о наличии в хрупком теле трещин различного размера и является характерной особенностью хрупкого разрушения, как и предполагала теория А. Гриффитса. Кроме того, принималось, что хаотичное распределение дефектов и микротрещин распространяется по всей длине хрупкого тела, в данном случае кварцевого оптического волокна. Для описания поверхностных микротрещин в зависимости от длины волокна использована статистическая модель, основанная на распределении В. Вейбулла. Построены графики В. Вейбулла в координатах, связывающих вероятность разрушения с прочностью, длиной волокна и параметром, описывающим предельную прочность.</p></abstract><trans-abstract xml:lang="en"><p>Metallized coatings can significantly improve the operational properties of quartz fibers. The research was conducted to determine the crack resistance, strength and dynamic fatigue of optical fibers without any coating and with copper coatings. The microhardness of quartz fibers was measured by the diamond indentation of end surfaces. The stress intensity parameter K1c was found from the A. Niihara semi-empirical dependence. The geometry of indentation and radial cracks was studied using a scanning electron microscope. The crack resistance of uncoated quartz turned out to be almost 3 times less as compared to the copper coating fiber, which is presumably due to the additive contribution of compressive stresses on fiber surfaces and quartz wetting with copper. Copper-coated optical fiber drawing increases the tensile strength, crack resistance and dynamic fatigue parameter, and it is the main resource for maintaining operation in the conditions of a statistical approach to structural strength. Comparative tests were conducted to check the optical fiber strength by two-point bending and axial tension methods. Experimental tests conducted to check the ultimate mechanical strength of quartz optical fibers showed a significant spread of data, which indicates the presence of cracks of various sizes in a brittle solid and is a characteristic feature of brittle fracture as suggested by the A. Griffiths theory. In addition, it was assumed that the chaotic distribution of defects and microcracks extends along the entire length of a brittle solid, a quartz optical fiber in this case. A statistical model based on the Weibull distribution was used to describe surface microcracks depending on the fiber length. As a result, Weibull graphs were plotted in coordinates connecting the probability of failure with the strength, fiber length and parameter describing the ultimate strength.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>трещиностойкость</kwd><kwd>прочность</kwd><kwd>оптическое волокно</kwd><kwd>медное покрытие</kwd><kwd>двухточечный изгиб</kwd><kwd>осевое растяжение</kwd></kwd-group><kwd-group xml:lang="en"><kwd>crack resistance</kwd><kwd>strength</kwd><kwd>optical fiber</kwd><kwd>copper coating</kwd><kwd>two-point bending</kwd><kwd>axial tension</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Авторы выражают свою благодарность А.А. Мальковой и Е.А. Ладыжец за содействие в исследовании на сканирующем электронном микроскопе.</funding-statement><funding-statement xml:lang="en">The authors thank A.A. Malkova and E.A. 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