CS271094B1 - Method of fatigue cracks' kinetic parameters checking without failure - Google Patents

Abstract

This solution concerns non-destructive control using acoustic emission signals, and may be used for checking fatigue cracks in structures to test cyclic load. The purpose thereof is an increase in accuracy on the account of measuring moment standards of the fatigue cracks. In order to ensure a comparing ratio between the acoustic emission signals and tension or deformation coefficient, the sample subject to the comparison is burdened until the crack therein reaches critical dimensions (size), while acoustic emission signals are measured. The sample is statically finished and the coefficient of tension or destruction intensity is determined according to the measured increase of fatigue marks in a crack. Thereafter, the checked product is then loaded cyclically, and the tension or destruction intensity and acoustic emission signals are measured. A kinetic parameter of the product fatigue crack is then assessed.

Description

271 094

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βΟΡΜΥΛΛ H3OBPETEIIHSI

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P E · E P A T

CriOCOG ΗΕΡΛ3ΡΥΙΜΛΒΒ] ΕΓ0 KOIITTOJIH KWIETHHECKHXΠΛΡΑΜΕΤΡΟΟ yCTJUlOCTMIX TPEDIHII O H3AEJIMHX i

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ConyrcTByeiuHR ΐθρτβ *.

Claims (1)

5 271 094 OBJECT OF THE INVENTION A method for controlling the kinetic parameters of fatigue cracks in articles, comprising: • cyclic loading thereof and measuring acoustic emission signals, characterized in that, in order to increase accuracy on account, the measurement of momentary fatigue crack parameters is measured. in the product during loading, and the controlled parameters are assessed according to the ratio of acoustic emission and distortion signals or Intensity to voltage, taking into account the dependence of these values on the comparison product. 1 drawing