SU1226301A1 - Method of determining depth of surface cracks - Google Patents

Abstract

The invention relates to non-destructive testing and can be used for ultrasonic testing of products using surface waves. The aim of the invention is to expand the technological capabilities of the control. In the proposed method, an ultrasonic transducer excites a pulse of a Rayleigh wave in a controlled product in the direction of an open crack. The pulses of Rayleigh waves reflected from the near edge and the tip of the crack are received, the time interval between the moments of their arrival is measured, and the depth of the crack is determined using the proposed formula. This method allows you to expand the technological capabilities of the control, since the control can be carried out in the case of unilateral access to the crack, 1 Il. i

Description

I1226;

 1 :: curetment refers to the indemnity fxiii :: 4y control K should not be used. o for y, :: ultrasonic control, using surface wolf

.Cjib keob1 / e-ge; infrared-raspgk L: gcheekl; of potentialities to -h5t oyoShecheny

I kzdply at odnosto

: - (to three days. Ja drawing of the image of the way of the method. / piratzovkova transform Releezku causes; LH, 1:, 3 and i of the Rayleigh E ps. vpeiiiKH is implemented in a manner.

(We are talking about the company; 1, paai ieDreKHoro jBepXoccTH we control E: - about the product in the direction; ь: that fissures; impulse p; 5LeE

i 2 “In the meantime, the transducer of osu-:;, sts: to receive 3-nm pulses of 3 Eol-g, reflected from the third; ; - a.Pg prippk; "ats nmpug (3)

CG - cracks, and then - r-pulse: in - ;; Y (: r ;; th wave; reflected from; s cracks. Ipterva measured: between the arrival of the impulse he 3 ii 1: | -wavy waves. Depth of elk; et by usoDMyjfe

five

eleven

i - is the time interval between the impulse reflected from the three-sided edge, and the impulse: ohm, reflecting from its chip.

The depth of the transducer is determined unfavorably on the flaw detector screen, the signal to which is received from the ultrasonic transducer 1. For this preliminary deflector, the deflector is adjusted by: reference (samples so that the distance on its screen between pulses of Rayleigh waves corresponds to half of the difference of these pulses. Then the depth of the measured log line corresponds to the distance - I5HG n ;;. The screen between the pulses 3 I-4,

The method of determining the depth of surface cracks allows spreading the technological capabilities of the control, since it is possible to measure cracks in the case; one-way access to them. The invention of the method for determining the lip of the surface of jiocTHbix cracks, which consists in the following: in the product under control in the direction of the opened excitation crack (T) Cycle of the Rzle wave, in T - l I; so that, with the expansion of the technological capabilities of the control, they take the Rayleigh wave pulses reflected from the near edge and the tip of the crack, measure the time interval d between the peaks, and determine the depth H of the crack using the formula

 0

M v

Rayleigh velocity 3 of the material under study.

V j

Compiled by G.Fyodorov

Editor I. Derbak Tehred L. Oleynk Proofreader

Order 2123/41 Circulation: 778

VNIIPI USSR State Committee

for inventions and discoveries 1GYu35, Moscow, Zh-35, Raushsk nab., 4/5

Production

- printing enterprise, Uzhgorod, Project.St. four

Claims (1)

Form. And a invention A method for determining the depth of surface cracks, which consists in the fact that a pulse of a Rayleigh wave is excited in the controlled product from the direction of the opened crack, which consists in the fact that, in order to expand the technological capabilities of the control, they accept reflected from the near edge and peaks of trash, otherwise the pulses of the Rayleigh wave, measure the time interval & ΐ between them and determine the depth H of the crack according to the skolostg formula! Rayleigh tonne in the studied material; N - 0.5 C _q d Y 40 where O., the speed of the Rayleigh wave in the material under study.