2_2020_sen_3

Title of the article

FATIGUE DAMAGE TO PRODUCTS DURING TESTING BY THE METHOD OF THE SWEEP FREQUENCY
Authors

SURIN Vitaliy M., D. Sc. in Eng., Prof., Professor of the Department “Engineering Graphics”, Belarusian State University of Informatics and Radioelectronics, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.
In the section DYNAMICS, DURABILITY OF VEHICLES AND STRUCTURES
Year 2020 Issue 2 Pages 30–36
Type of article RAR Index UDK 620.178.311 Index BBK  
Abstract A method for assessing fatigue damage during vibration testing of electronic products by the sweep frequency method is considered, which is the main method when testing for the effects of sinusoidal vibration and consists in smooth frequency changing in a given range from lower to upper and vice versa, so that the resonances of the elements of the tested product are sequentially excited at a constant set exposure level. To assess the damage, the power equation of the fatigue curve has been used. The probability of the appearance of response amplitudes at a certain frequency was replaced by the probability of excitation being at this frequency. The use of frequency range intervals normalized with respect to the natural frequency f0 made it possible to exclude the influence of the scatter of the values f0 of the product elements when comparing the results. A quantitative assessment of damage in the preresonance, resonance and extraresonance frequency range intervals is proposed for the recommended values of mechanical quality factor and the slope of the fatigue curve in double logarithmic coordinates for the following frequency variation dependencies that ensure constancy of: the transit time of the resonance band of all elements of the product; the rate of change of frequency over the entire range; the number of oscillations of all elements of the product in the resonance band. It was established that the influence of the frequencies of the resonance band on the damageability grows with an increase in the quality factor and the slope of the fatigue curve, the width of the resonance band is determined by the quality factor, the dependence f(t) is the most effective in vibration tests, at which the rate of frequency change remains constant over the entire range.
Keywords

vibration resistance, sinusoidal vibrations, fatigue damage, oscillating frequency, damage summation
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Bibliography
  1. Beglaryan V.Kh. Mekhanicheskie ispytaniya priborov i apparatury [Mechanical tests of devices and equipment]. Moscow, Mashinostroenie Publ., 1990. 223 p.
  2. State Standard 20.57.406-81. Kompleksnaya sistema ispytaniya kachestva. Izdeliya elektronnoy tekhniki, kvantovoy elektroniki i elektrotekhnicheskie. Metody ispytaniy [Complex quality testing system. Products of electronic engineering, quantum electronics and electrotechnical products. Test methods]. Minsk, Gosstandart Publ., Moscow, Standartov Publ., 1982. 165 p.
  3. Biderman V.L. Teoriya mekhanicheskikh kolebaniy [Theory of mechanical vibrations]. Moscow, Vysshaya shkola Publ., 1980. 408 p.
  4. Goloskokov E.G., Filippov A.P. Nestatsionarnye kolebaniya deformiruemykh sistem [Unsteady oscillations of deformable systems]. Kiev, Naukovaya dumka Publ., 1977. 339 p.
  5. Surin V.M., Dzerzhinskiy S.M. Ustalostnaya dolgovechnost pri deystvii sinusoidalnoy i sluchaynoy vibratsiy [Fatigue durability under the action of sinusoidal and random vibrations]. Vestsi Natsyyanalnay akademii navuk Belarusi. Seryya fizika-tekhnichnykh navuk [Proceedings of the National Academy of Sciences of Belarus, Physical-Technical Series], 2008, no. 8, pp. 38–42.
  6. Dzerzhinskiy S.M., Surin V.M. Dolgovechnost elektronnykh elementov, ispytyvaemykh na vibroprochnost [Durability of electronic elements tested for vibration resistance]. Problemy infokommunikatsiy [Problems of infocommunications], 2015, no. 1, pp. 62–65.
  7. Kogaev V.P., Makhutov N.A., Gusenkov A.P. Raschety detaley mashin i konstruktsiy na prochnost [Calculations of machine parts and structures for strength]. Moscow, Mashinostroenie Publ., 1985. 220 p.
  8. Surin V.M., Dzerzhinskiy S.M. Sravnenie rezhimov stendovykh ispytaniy na vibroprochnost [Comparison of modes of bench tests for vibration resistance]. Vestnik mashinostroeniya [Bulletin of mechanical engineering], 2008, no. 10, pp. 22–25.
  9. State Standard 25.504-82. Raschety i ispytaniya na prochnost. Metody rascheta kharakteristik soprotivleniya ustalosti [Calculations and strength tests. Methods of calculation of fatigue resistance characteristics]. Minsk, Gosstandart Publ., Moscow, Standartov Publ., 1982. 81 p.
  10. State Standard 25.507-85. Raschety i ispytaniya na prochnost v mashinostroenii. Metody ispytaniy na ustalost pri ekspluatatsionnykh rezhimakh nagruzheniya. Obshchie trebovaniya [Calculations and strength tests in mechanical engineering. Methods of fatigue tests under operational loading conditions. General requirements]. Minsk, Gosstandart Publ., Moscow, Standartov Publ., 1985. 31 p.
  11. Dzerzhinskiy S.M., Surin V.M. Issledovanie modeli “slabogo zvena” statisticheskim modelirovaniem [Study of the “weak link” model by statistical modeling]. Problemy infokommunikatsiy [Problems of infocommunications], 2015, no. 2, pp. 48–50.
  12. Gadenin M.M. Issledovanie povrezhdaemosti i dolgovechnosti konstruktsiy pri odno i dvukhchastotnykh rezhimakh nagruzheniya na osnove deformatsionnykh i energeticheskikh podkhodov [Study of damage and durability of structures at one and two-frequency loading modes on the basis of deformation and energy approaches]. Zavodskaya laboratoriya. Diagnostika materialov [Industrial laboratory. Diagnostics of materials], 2017, vol. 83, no. 6, pp. 44–51.