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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.

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.

vibration resistance, sinusoidal vibrations, fatigue damage, oscillating frequency, damage summation

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