ipolytechiPolytech JournaliPolytech Journal2782-40042782-6341Irkutsk National Research Technical University10.21285/1814-3520-2023-3-501-510TRSQYGipolytech-731Research ArticleМАШИНОСТРОЕНИЕMECHANICAL ENGINEERINGМетодика обработки экспериментальных данных при исследовании остаточных напряжений сверлением зондирующих отверстий c использованием метода цифровой корреляции изображенийMethod for processing experimental data when investigating residual stresses by drilling probe holes and digital image correlationhttps://orcid.org/0000-0002-3266-9724МахаловМ. С.MakhalovM. S.

Махалов Максим Сергеевич, к.т.н., доцент, доцент кафедры технологии машиностроения

650026, г. Кемерово, ул. Весенняя, 28

Maksim S. Makhalov, Cand. Sci. (Eng.), Associate Professor, Associate Professor of the Mechanical Engineering Technologies Department

28 Vesennyaya St., Kemerovo 650026

maxim_ste@mail.ruhttps://orcid.org/0000-0002-7569-7362КречетовА. А.KrechetovA. A.

Кречетов Андрей Александрович, к.т.н., доцент, доцент кафедры технологии машиностроения

650026, г. Кемерово, ул. Весенняя, 28

Andrey A. Krechetov, Cand. Sci. (Eng.), Associate Professor, Associate Professor of the Mechanical Engineering Technologies Department

28 Vesennyaya St., Kemerovo 650026

krechetovaa@kuzstu.ruhttps://orcid.org/0000-0002-3711-1535БлюменштейнВ. Ю.BlumensteinV. Yu.

Блюменштейн Валерий Юрьевич, д.т.н., профессор, профессор кафедры технологии машиностроения

650026, г. Кемерово, ул. Весенняя, 28

Valeriy Yu. Blumenstein, Dr. Sci. (Eng.), Professor, Professor of the Mechanical Engineering Technologies Department

28 Vesennyaya St., Kemerovo 650026

blumenstein@rambler.ruhttps://orcid.org/0000-0001-6464-6159ГорбатенкоВ. В.GorbatenkoV. V.

Горбатенко Вадим Владимирович, к. ф.-м. наук, старший научный сотрудник

634025, г. Томск, Академический просп., 2/4

Vadim V. Gorbatenko, Cand. Sci. (Phys.- Math.), Senior Researcher

2/4, Akademicheskii pr., Tomsk 634025

gvv@ispms.tsc.ruКузбасский государственный технический университет им. Т.Ф. ГорбачеваРоссияT. F. Gorbachev Kuzbass State Technical UniversityRussian FederationИнститут физики прочности металлов СО РАНРоссияInstitute of Strength Physics and Materials Science of the Siberian Branch of the Russian Academy of Sciences TomskRussian Federation202302102023273501510Copyright © Махалов М.С., Кречетов А.А., Блюменштейн В.Ю., Горбатенко В.В., 20232023Махалов М.С., Кречетов А.А., Блюменштейн В.Ю., Горбатенко В.В.Makhalov M.S., Krechetov A.A., Blumenstein V.Y., Gorbatenko V.V.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://ipolytech.elpub.ru/jour/article/view/731

Цель  –  получение  экспериментальных  данных  и  оценка  возможности  достоверного  определения значений остаточных напряжений поверхностного слоя металла сверлением зондирующих отверстий и методом цифровой корреляции изображений. Экспериментальные образцы изготавливались и впоследствии обрабатывались свободным ортогональным резанием и поверхностным пластическим деформированием по схеме качения на специальном станке с числовым программным управлением. Далее с использованием того же станка выполнялось сверление зондирующих отверстий с видеосъемкой изображения поверхности до и после сверления. По изменению спеклов изображений методом цифровой корреляции изображений определялись смещения материальных частиц на поверхности образца, после чего дифференцированием полученных значений перемещений определяли значения радиальных деформаций. Статистический анализ выборки значений радиальных деформаций на одинаковом  расстоянии  от  центра  отверстия  при  изменении  угла  поворота  путем  разложения  в  ряды  Фурье  с вычислением периода распределения показал, что распределение является периодическим. Установлено, что периодограммы, построенные по экспериментальным данным, имеют локальные максимумы при значении периода, близком к 180 градусам. Это обстоятельство обусловливает неизменность вычисляемых значений главных компонент остаточных напряжений и угла их поворота при выборе для расчета значений радиальных деформаций в произвольных точках вокруг отверстия. В работе изложен подход, позволяющий определить остаточные напряжения путем сверления зондирующих отверстий и оценки перемещений материальных частиц на поверхности образца, обусловленных перераспределением остаточных напряжений. Для аналитического описания экспериментальных данных предложено использовать аппроксимирующую периодическую функцию, установлен физический смысл ее коэффициентов.

This paper investigates the cutting forces arising when using a single abrasive grain. Analytical studies were carried out using a model of a single abrasive grain in the form of a rod with a radiused apex acting on the workpiece material. The slip-line method (method of characteristics) was used to calculate the deformation intensity of a plastically edged workpiece material under the action of a single grain. Mathematical models were developed for the following factors: plastic deformation of the material, edging of the stagnated zone and its friction against the grain surface when moved upwards in the form of chippings, grain friction against the plastically deformed material, and the action of the dynamic component of plastic deformation. The significance of the dynamic component in the overall balance of forces related to plastic deformation was established by determining the ratio of dynamic stress on the break line and shear yield point. This dependence calculated for D16T and 30HGSA materials showed the feasibility of accounting for the dynamic component subsequently processed by free orthogonal cutting and rolling contact deformation using a special machine with numerical control. Further, using the same machine, drilling of probing holes was performed with video recording of the surface image prior to and following drilling. By varying the speckle images, the displacements of material particles on the sample surface were determined by the digital image correlation method, following which the radial deformations were determined by differentiating the obtained displacement values. Statistical analysis of a sample of radial deformations equidistant from the centre of the hole while varying the rotation angle by Fourier transformation with the calculation of the distribution period showed that the distribution is periodic. It is established that the periodograms constructed using experimental data have local maxima at a period value close to 180 degrees. This determines that the main calculated components of the residual stresses and the angle of their rotation be constant when selected to calculate the values of radial deformations at arbitrary points around the hole. The paper presents an approach that allows residual stresses to be determined by drilling probing holes and assessing the displacement of material particles on the sample surface due to the redistribution of residual stresses. For the analytical description of experimental data, it is proposed that an approximating periodic function be used, and the physical meaning of its coefficients is determined.

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The authors declare that there are no conflicts of interest present.