SU979987A1

SU979987A1 - Method of checking bonds in multi-layer structures

Info

Publication number: SU979987A1
Application number: SU813297364A
Authority: SU
Inventors: Марк Павлович Тонконогов; Камбар Мухитович Омаров; Борис Иванович Ворожцов
Original assignee: Карагандинский Ордена Трудового Красного Знамени Политехнический Институт
Priority date: 1981-06-08
Filing date: 1981-06-08
Publication date: 1982-12-07

Description

(54) СПОСОБ КОНТРОЛЯ СОЕДИНЕНИЙ В МНОГОСЛОЙНЫХ КОНСТРУКЦИЯХ(54) METHOD OF CONTROL OF COMPOUNDS IN MULTILAYER STRUCTURES

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Изобретение относитс к неразруи1ающему кошролю и может быть использовано при ультразвуковом контроле прошости склеивани сложных неметаллических конструкций.The invention relates to a non-destructive coating and can be used in the ultrasonic testing of the bonding prosthesis of complex non-metallic structures.

Известен способ контрол соединений в мнотослойных конструкци х, заключаюиишс в том, что в контролируемом изделии возбуждают ультразвуковую волну, измер ют импеданс нагрузки при излучении и по этому импедансу суд т о наличии расслоени 1 .A known method for controlling connections in multilayer structures implies that an ultrasonic wave is excited in a controlled product, the load impedance is measured during radiation, and the presence of a bundle 1 is judged by this impedance.

Однако этот способ не позвол ет контролировать издели , один из слоев которых вьшолнен из материала с большим затуханием ультразвуковых колебаний.However, this method does not allow control of products, one of the layers of which is made of a material with a large attenuation of ultrasonic vibrations.

Наиболее близким к изобретению по Texiniческой сущности и достигаемому результату вл етс способ контрол соединений в многослойных конструкци х, заключающийс в том, что в ко1гтролируемом изделии возбуждают ультразвуковую волну и фиксируют волны Лэмба, возникающие при наличии отслоени 2.The closest to the invention in terms of the Texist essence and the achieved result is a method for controlling joints in multilayer structures, which consists in the excitation of an ultrasonic wave in the co-ordinated product and in the presence of peeling 2 Lamb waves.

Однако зтот способ не позвол ет получать данные о механической прочности клеевого соединени и обнаруживать места слабой адгезионНОЙ или когезнонной св зи, с цельно оторакопки изделий;.However, this method does not allow to obtain data on the mechanical strength of the adhesive joint and to detect weak adhesion or cohesive bonding points, with the complete development of products ;.

Целью изобретенн вл етс повгтизение информативностк контрол .The purpose of the invented approach is to provide information control.

Поставлшша цель достигаетс тем. что в способе контрол соедииентй в многослойных конструкци х, заключающемс в том., что в контролируемом изделии возб},,); ультразг уковую волну и фиксируют изл)ченне, B03nviic3joщее при отслоени , перед контролем издели Delivered goal achieved by. that in the method of controlling compounds in multilayer structures, consisting in the fact that in a controlled product there is voz},); ultrasonic wave and fix the irregularity of the B03nviic3jo in the process of detachment before the control of the product

10 ввод т в клей о.щгодомеииые частлшл ссгпетоэлектрнческих кристаллов, в качестве излучени фиксируютэлектромапп)тную ВОЛЕГ/. злуаемую однодоменпымн частицами, а по И ггеис.нзности и диаграмме направлен.чосги этого излу15 чени определ ют механическую пропость соединени и местонахождение отслоени .10 are inserted into the glue with the help of randomized part of sgpetoelektricheskikh crystals, as the radiation is fixed electromotive volga. degraded by single-domain particles, and by mechanical radiation and a diagram of the direction of this radiation, the mechanical loss of the joint and the location of the detachment are determined.

Способ контрол соединений в многослЗнных конструкщ х осуществл етс следз/тош м образом .The method of controlling compounds in multi-structural constructions is carried out in a squirrel / nauseous manner.

2020

Claims

In the controlled zhlsni excite ultrasonic vibrations in raztshpnyh wheelbarrows surface. In places; where there are weak adhesion bonds between the layers, their 3979 vibration occurs. In places of weakened communication, single-domain particles of segeoelectric crystals, previously introduced into the glue (2-3% of the total weight), also oscillate. Since there are spontaneously formed charges on the surface of the domains, they, accelerating upon oscillation, produce electromagnet radiation. This radiation is significant because the oscillations of the layers are carried out at a resonant frequency. Electromagnetic waves excited by domain oscillations are captured by the probe. The weaker the bond between the layers, the greater the intensity is radiated, the magnitude of which can determine the mechanical strength of the joint. In each case, the radiation pattern of the electromagnetic radiation is determined by non-glueing by moving the probe. According to this diagram, the location of the detached is judged. The method of clapgrol compounds in multilayer structures makes it possible to increase the information content of the control, since the intensity of the electromagnetic radiation that occurs in places of detachment due to oscillations of one domain particle of ferroelectric crystals is much more sensitive to the mechanical strength of the compound. This allows a more accurate assessment of the defectiveness of the product. DETAILED DESCRIPTION OF THE INVENTION A method for controlling compounds in multi-layered structures is that an ultrasonic wave is excited in a controlled product and the radiation detected during delamination is different in that, in order to increase the information content, a scroll is inserted into an adhesive or odometesh particles of ferroelectric crystals, the radiation is recorded by an electromagnetic wave emitted by a single domain by 1 particles, and the intensity is determined by the intensity and radiation pattern of this radiation; 0g ECK the bond strength and the location of delamination. Istoshiki information taken in shmaniyu during the examination 1. Yu. Yu. V. Acoustic meyud; non-destructive testing of compounds in multilayer structures, Defectoscopy, 1974. N 5, p. 70-79.

2. Ermolov, I. N., Methods of Ultrasonic Flaw Detection., Part 2, M., MGI, 1968, p. 9394 (prototype).