SU1427292A1 - Method of checking adhesive joints - Google Patents

Abstract

The invention relates to non-destructive testing and can be used to control adhesive joints using acoustic vibrations. The aim of the invention is to increase the reliability of control due to the complete polarization of the domains of ferro additives. According to the method of controlling glue joints, a ferroceramic powder is introduced into the adhesive, and this powder is applied to polarize the domains with a constant and alternating electric field and a field of elastic oscillations. Moreover, the frequencies of the alternating electric field and the field of elastic oscillations are the same and are pumped in the process of polarization. Then, ultrasonic vibrations are emitted into the controlled product. The electromagnetic field emitted by a ferroelectric powder under the action of ultrasonic vibrations is recorded. The intensity of the electromagnetic field is measured and the strength of the glued joint and the presence of peeling are determined by the intensity. 1 il. SS

Description

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The invention relates to non-destructive testing and can be used to control adhesive joints using acoustic signals.

The aim of the invention is to increase the reliability of control due to the complete polarization of the domains of ferro additives.

The drawing shows a device for implementing a method for controlling adhesive joints.

The device contains a source of 1 alternating electrical voltage, a source 2 of constant electrical voltage, a passage capacitance 3 and an inductance 4, an emitter 5 of ultrasound, two electrodes 6 and 7 superimposed on the structures 9,

prine After 2-3 minutes, turn off the source of alternating voltage 1 and smoothly decrease the voltage of direct current source 2 to zero for 30-60 s.

Polarizing the domains with a constant electric field component while simultaneously operating ultrasound vibrations on the adhesive layer, whose frequencies are equal and swinging, 10 also provides a high residual polarization of the additive domains at a lower constant electric field component by shifting the domain boundaries by resonant oscillations . At the same time, polarizations are achieved at lower energy costs compared to constant forces, since they affect only those processes that occur at these frequencies, as a result of which a larger number of domains are reoriented over the field created by

consisting of parts glued together by an adhesive layer 10.

The method of controlling adhesive joints is carried out as follows.

A ferroelectric powder is added to the glue. The use of a 20 component as an additive due to the coincidence of a ferroelectric ceramic powder, particles of resonances and their search by rocking a partial one is an aggregate segment-one. In order to improve the relaxation of free charges arising in the structure, the electrodes 6 and 7 are not disconnected from the voltage sources for 20-60 minutes. It also increases the residual polarization of ferroelectric powders due to the elimination of the polarization effect by the electric field created by free charges. After polarization, the ultrasound radiates into the product.

non-electric monocrystalline grains provides a high residual polarization of the domains, since such particles, regardless of orientation in space after polarization, do not have zero dipole moment, which occurs at angles between the polarization axis of the single crystal particle to the polarizing field, close to or equal to 90 or .Q 270 °, and the combination of ferroelectric single-crystal grains reduces the effect of domain misorientation by a double electric layer at the single-crystal – polymer boundaries due to the presence of large The number of boundaries between the grains of the particles, which compensate for the single crystal - polymer boundary. Glue the parts 8 and 9 designs with this glue. The adhesive layer 10 is allowed to polymerize and the product is placed in an alternating constant electric field with the simultaneous action of ultrasonic vibrations. For this purpose, metal electrodes 6 and 7 are applied to the structure, to which a constant voltage source 2 is connected through passage inductance 4 with a working voltage chosen so that the electric field on the adhesive layer is not more than 1000 V / mm. The alternating voltage source 1 is connected to the electrode 6 through the passage capacitance 3 with an amplitude of oscillations in such a way that the variable component of the electric field strength on the adhesive layer is not more than 50 V / mm. Through electrode 7, connected to earth, in const40

which affect the adhesive layer 10, activated ferroelectric powder. Under the action of ultrasound, a polarized ferroelectric ceramic powder emits electromagnetic waves, which register radiation. The intensity of the electromagnetic field is measured and the strength of the adhesive joint and the presence of peeling are determined by the intensity.

Claims (1)

Invention Formula The method of controlling adhesive joints is that, when gluing a structure, ferro-additives are added to the glue, ferro-additives are applied to polarize their domains with a constant electric field, ultrasonic vibrations are emitted into the product, and the electromagnetic field radiated by the ferro-additives under the action of ultrasonic vibrations, the amplitude of the electromagnetic field is measured, and the strength of the adhesive joint and the presence of peeling are determined by the amplitude, characterized in that, in order to increase the reliability l, as segnetodobavki administered segnetokeramichesky powder at floor polarization dopol45 50 The operation with the help of the emitter 5 ultra-55 is acted upon by alternating electri- um, emitting an ultrasonic oscillating field and a field of elastic oscillating polarization time. The emitter 5 is excited from a variable source 1, whose frequencies are equal and vary relative to a predetermined frequency. prine After 2-3 minutes, turn off the source of alternating voltage 1 and smoothly decrease the voltage of direct current source 2 to zero for 30-60 s. Polarizing the domains with a constant electric field component while simultaneously operating ultrasound vibrations on the adhesive layer, the frequencies of which are equal and swinging, also ensures a high residual polarization of the additive domains at a lower constant electric field component by shifting the domain boundaries by resonant oscillations. . At the same time, polarizations are achieved at lower energy costs compared to constant forces, since they affect only those processes that take place at these frequencies, as a result, a larger number of domains are reoriented over the field created by This is due to the coincidence of the resonances and their sweeping by oscillation of the frequencies. In order to improve the relaxation of free charges arising in the structure, the electrodes 6 and 7 are not disconnected from the voltage sources for 20-60 minutes. It also increases the residual polarization of ferroelectric powders due to the elimination of the polarization effect by the electric field created by free charges. After polarization, the ultrasound radiates into the product. Q 0 which affect the adhesive layer 10, activated ferroelectric powder. Under the action of ultrasound, the polarized ferroceramic powder emits electromagnetic waves, which are registered. The intensity of the electromagnetic field is measured and the strength of the adhesive joint and the presence of peeling are determined by the intensity. Invention Formula The method of controlling adhesive joints is that, when gluing a structure, ferro-additives are added to the glue, ferro-additives are applied to polarize their domains with a constant electric field, ultrasonic vibrations are emitted into the product, and the electromagnetic field radiated by the ferro-additives under the action of ultrasonic vibrations, the amplitude of the electromagnetic field is measured, and the strength of the adhesive joint and the presence of peeling are determined by the amplitude, characterized in that, in order to increase the reliability l, as segnetodobavki administered segnetokeramichesky powder at floor polarization dopol5 0 whose frequencies are equal and vary relative to a given frequency. F Sp Y /////////////// 7 ////////////// A A V /////////// 7 // 7 ////////////// U 9 /