CN110261480B - System and method for rapidly testing acoustic emission response performance of piezoelectric material - Google Patents

System and method for rapidly testing acoustic emission response performance of piezoelectric material Download PDF

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Publication number
CN110261480B
CN110261480B CN201910642532.8A CN201910642532A CN110261480B CN 110261480 B CN110261480 B CN 110261480B CN 201910642532 A CN201910642532 A CN 201910642532A CN 110261480 B CN110261480 B CN 110261480B
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pressure head
acoustic emission
signal
piezoelectric
signal acquisition
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CN110261480A (en
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田昕
甘海啸
付涛
梁晓辉
温茂萍
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Institute of Chemical Material of CAEP
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/04Analysing solids
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/22Details, e.g. general constructional or apparatus details
    • G01N29/223Supports, positioning or alignment in fixed situation

Abstract

The invention discloses a system for rapidly testing acoustic emission response performance of a piezoelectric material, which comprises a testing device, an excitation signal generating device and a signal acquisition device, wherein the excitation signal generating device is connected with the testing device; the testing device comprises a supporting seat, a metal pressure head, a metal base and a spring, wherein the supporting seat comprises a bottom plate and a support, the support is arranged on the bottom plate, the metal base is arranged on the bottom plate, and the metal pressure head is in an inverted H shape and comprises a first pressure head, a connecting rod and a second pressure head. The system of the invention can realize rapid test of the response performance of the system to acoustic emission signals without plating electrodes, packaging and signal extraction on the piezoelectric polymer material.

Description

System and method for rapidly testing acoustic emission response performance of piezoelectric material
Technical Field
The invention relates to the technical field of acoustic emission sensing, in particular to a system and a method for rapidly testing acoustic emission response performance of piezoelectric materials.
Background
The acoustic emission detection technology is widely applied to nondestructive detection of materials, and the acoustic emission sensor is a key device for acoustic emission detection, wherein the piezoelectric sensor is the acoustic emission sensor which is most popular and widely applied at present. Piezoelectric polymers (such as PVDF and its copolymers) are a class of piezoelectric materials of great interest because of their light weight, ease of molding, flexibility, and the like. However, since the piezoelectric polymer belongs to a dielectric material, electrodes are plated on the surface of the piezoelectric polymer, the piezoelectric polymer is packaged and a signal wire is led out when the piezoelectric polymer is subjected to performance test in the prior art, and the process is complex, tedious, time-consuming and labor-consuming, and brings more inconvenience for material-level research.
Disclosure of Invention
The invention aims to overcome the defects in the background art, and provides a system and a method for rapidly testing acoustic emission response performance of a piezoelectric polymer material, which can rapidly test the response performance of the piezoelectric polymer material to acoustic emission signals without plating electrodes, packaging and signal extraction.
In order to achieve the technical effects, the invention adopts the following technical scheme:
a system for rapidly testing acoustic emission response performance of piezoelectric materials comprises a testing device, an excitation signal generating device and a signal acquisition system; the testing device comprises a supporting seat, a metal pressure head, a metal base and a spring, wherein the supporting seat comprises a bottom plate and a support, the support is arranged on the bottom plate, the metal base is arranged on the bottom plate, the metal pressure head is in an inverted H shape and comprises a first pressure head, a connecting rod and a second pressure head, the two ends of the connecting rod after passing through the support are respectively connected with the first pressure head and the second pressure head, the second pressure head is in pressure connection with the metal base, and the spring with the two ends respectively abutted against the second pressure head and the support is sleeved on the connecting rod; the second pressure head can be applied with a certain pretightening force through the spring, so that a sample to be measured is better clamped between the second pressure head and the metal base, the excitation signal generating device acts on the bottom plate to generate an excitation signal, the excitation signal is transmitted to the sample to be measured through the bottom plate, the signal acquisition system is respectively and electrically connected with the metal pressure head and the metal base, wherein the metal pressure head is used as positive electrode output to be connected with the signal acquisition system, the metal base is used as negative electrode output to be connected with the signal acquisition system, and the signal acquisition system is used for acquiring a voltage response signal generated by the sample to be measured and displaying and analyzing data.
Further, the support of the support seat is L-shaped, and/or the bottom plate and the support are integrally formed.
Further, the support base is made of an insulating material.
Further, the support base is made of plexiglas, phenolic resin or fiber reinforced composite material.
Further, the signal acquisition system comprises a signal acquisition device and a preamplifier, wherein the signal acquisition device is an acoustic emission signal acquisition instrument or an oscilloscope, and the signal acquisition device is directly realized by adopting the existing acoustic emission signal acquisition instrument or oscilloscope.
Further, the signal acquisition device is connected with the output end of the pre-amplifier through a coaxial cable, the input end of the pre-amplifier is respectively connected with the metal pressure head and the metal base through the coaxial cable, specifically, the output end of the pre-amplifier is connected with the acoustic emission signal acquisition instrument through the coaxial cable, and the input end of the pre-amplifier is respectively electrically connected with the metal pressure head and the metal base through the positive electrode and the negative electrode of the coaxial cable.
Further, the excitation signal generating device comprises a signal generator and a piezoelectric ceramic sensor, wherein the signal generator is electrically connected with the piezoelectric ceramic sensor, and the piezoelectric ceramic sensor is arranged on the bottom plate.
Further, the piezoelectric ceramic sensor is adhered to the bottom plate.
Meanwhile, the invention also discloses a method for rapidly testing the acoustic emission response performance of the piezoelectric material, which is realized by the system for rapidly testing the acoustic emission response performance of the piezoelectric material and specifically comprises the following steps:
A. the signal acquisition system is electrically connected with the metal pressure head and the metal base respectively;
B. clamping a piezoelectric polymer sample to be tested on the second pressure head and the metal base;
C. generating an excitation signal on a bottom plate of the supporting seat through an excitation signal generating device;
D. transmitting an excitation signal to a piezoelectric polymer sample to be tested by a bottom plate, and enabling the piezoelectric polymer sample to be tested to generate voltage response;
E. and the signal acquisition system acquires a voltage response signal generated by the piezoelectric polymer sample, so that the response performance of the piezoelectric polymer sample to be tested to the acoustic emission signal is analyzed.
Further, in the step C, the excitation signal may be generated by a lead breaking, ball falling or signal generator, and/or the signal acquisition system includes a signal acquisition device and a preamplifier, and the step E specifically includes: the voltage response generated by the piezoelectric polymer sample to be tested is amplified by the preamplifier and then transmitted to the signal acquisition device, so that the response performance of the piezoelectric polymer sample to be tested to the acoustic emission signal is analyzed.
Compared with the prior art, the invention has the following beneficial effects:
the system and the method for rapidly testing the acoustic emission response performance of the piezoelectric material can rapidly test the response performance of the piezoelectric polymer material to the acoustic emission signal without plating electrodes, packaging and signal extraction, and the testing device in the system has the advantages of simple structure and convenient use, and can greatly save cost and development time.
Drawings
FIG. 1 is a front view of a testing device in one embodiment of the invention.
FIG. 2 is a top view of a test device in one embodiment of the invention.
Fig. 3 is a schematic diagram of a system for rapidly testing the acoustic emission response performance of a piezoelectric material in accordance with the present invention.
Reference numerals: 11-supporting seat, 12-metal pressure head, 13-metal base, 14-spring, 111-bottom plate, 112-support, 121-first pressure head, 122-connecting rod, 123-second pressure head, 21-signal generator, 22-piezoceramics sensor, 31-acoustic emission signal acquisition instrument, 32-display, 33-preamplifier, 4-coaxial cable, 200-piezoceramics polymer sample to be tested.
Detailed Description
The invention is further illustrated and described below in connection with the following examples of the invention.
Examples:
embodiment one:
a system for rapidly testing acoustic emission response performance of piezoelectric materials comprises a testing device, an excitation signal generating device and a signal acquisition system.
As shown in fig. 1 and 2, the testing device includes a supporting seat 11, a metal pressure head 12, a metal base 13 and a spring 14, wherein the supporting seat 11 includes a bottom plate 111 and a bracket 112, the bracket 112 is disposed on the bottom plate 111, the metal base 13 is mounted on the bottom plate 111, in this embodiment, the metal pressure head 12 is in an inverted H-shape and specifically includes a first pressure head 121, a connecting rod 122 and a second pressure head 123, two ends of the connecting rod 122 after passing through the bracket 112 are respectively connected with the first pressure head 121 and the second pressure head 123, the second pressure head 123 is in pressure connection with the metal base 13, and the spring 14 with two ends respectively abutting against the second pressure head 123 and the bracket 112 is sleeved on the connecting rod 122; a certain pretightening force can be applied to the second pressure head 123 through the spring 14, so that the sample to be measured is better clamped between the second pressure head 123 and the metal base 13.
Preferably, in the present embodiment, the supporting seat 11 is made of an insulating material, such as organic glass, phenolic resin or fiber reinforced composite material, and the bracket 112 of the supporting seat 11 is L-shaped, and the bottom plate 111 and the bracket 112 are integrally formed.
The excitation signal generating device acts on the base plate 111 to generate an excitation signal, so that the excitation signal is transmitted to the sample to be tested through the base plate 111, the excitation signal can be generated by a lead breaking mode, a ball falling mode or a mode of emitting by the signal generator 21, in the embodiment, the excitation signal generating device comprises the signal generator 21 and the piezoelectric ceramic sensor 22, the signal generator 21 and the piezoelectric ceramic sensor 22 are all existing mature products, the signal generator 21 is electrically connected with the piezoelectric ceramic sensor 22, and the piezoelectric ceramic sensor 22 is adhesively mounted on the base plate 111.
The signal acquisition system is electrically connected with the metal pressure head 12 and the metal base 13 respectively and is used for acquiring voltage response signals generated by a sample to be tested and displaying and analyzing data. In this embodiment, the signal acquisition system is specifically composed of a preamplifier and a signal acquisition device, the signal acquisition device is an acoustic emission signal acquisition instrument 31 or an oscilloscope, and the signal acquisition device is directly an acoustic emission signal acquisition instrument 31 or an oscilloscope, and as an optimization, in this embodiment, the signal acquisition device is specifically realized through the acoustic emission signal acquisition instrument 31 and a matched display 32 thereof, the acoustic emission signal acquisition instrument 31 is specifically connected with an output end of the preamplifier 33 through a coaxial cable 4, an input end of the preamplifier 33 is specifically connected with the metal pressure head 12 and the metal base 13 through the coaxial cable 4, and specifically, when in use, a voltage signal generated by the piezoelectric polymer sample 200 to be measured is transmitted to the preamplifier 33 through the metal pressure head 12 and the metal base 13, and is transmitted to the acoustic emission signal acquisition instrument 31 after being amplified through the preamplifier 33, and the data are displayed through the acoustic emission signal acquisition instrument 31 and the display 32.
As shown in fig. 3, when in use, the input end of the preamplifier 33 of the present embodiment is connected with the metal pressure head 12 as the positive electrode and the metal base 13 as the negative electrode respectively through the coaxial cable 4, the output end of the preamplifier 33 is connected with the acoustic emission signal acquisition instrument 31 through the coaxial cable 4, then the piezoelectric polymer sample 200 to be tested is clamped on the second pressure head 123 and the metal base 13, the piezoelectric polymer sample 200 to be tested can be clamped between the second pressure head 123 and the metal base 13 relatively firmly through the thrust exerted by the spring 14 on the second pressure head 123, then the piezoelectric ceramic sensor 22 is adhered on the bottom plate 111, and the piezoelectric ceramic sensor 22 is connected with the signal generator 21 through the signal wire, thus the signal generator 21 can be started, the voltage signal is generated by the signal generator 21 and transmitted to the piezoelectric ceramic sensor 22, the piezoelectric ceramic sensor 22 converts the voltage signal into mechanical output, so that an excitation signal is generated on the bottom plate 111, the excitation signal is transmitted to the piezoelectric polymer sample 200 to be tested by the bottom plate 111, the piezoelectric polymer sample 200 to be tested generates a voltage response signal, the voltage response signal generated by the piezoelectric polymer sample 200 to be tested is transmitted to the preamplifier 33 by the metal pressure head 12 and the metal base 13 through the coaxial cable 4 for signal amplification, the signal is transmitted to the acoustic emission signal acquisition instrument 31 after being amplified by the preamplifier 33, and the voltage response signal acquired by the acoustic emission signal acquisition instrument 31 is displayed by the display 32, so that the response performance of the piezoelectric polymer sample 200 to be tested to the acoustic emission signal is analyzed.
Specifically, in this embodiment, the acoustic emission signal acquisition instrument 31 is selected from the following types: the model of the piezoelectric ceramic sensor 22 selected for the Express8 acoustic emission system of the american Physical Acoustic Company (PAC) is: a PACWD acoustic emission sensor from american Physical Acoustic Corporation (PAC) selected for the model number of signal generator 21 is: agilent 33250A signal generator, the model of the pre-amplifier 33 is: PACAE5A preamplifier from America Physical Acoustic Co (PAC).
Example two
The method for rapidly testing the acoustic emission response performance of the piezoelectric material is realized by the system for rapidly testing the acoustic emission response performance of the piezoelectric material, and specifically comprises the following steps:
step one: the signal acquisition system is electrically connected with the metal pressure head 12 and the metal base 13 respectively.
The signal acquisition system in this embodiment is composed of a preamplifier 33 and a signal acquisition device, the signal acquisition device is an acoustic emission signal acquisition instrument 31 and a display 32 matched with the acoustic emission signal acquisition instrument 31, the acoustic emission signal acquisition instrument 31 is specifically connected with the output end of the preamplifier 33 through a coaxial cable 4, and the input end of the preamplifier 33 is connected with the metal pressure head 12 and the metal base 13 through the coaxial cable 4.
Step two: the piezoelectric polymer sample 200 to be measured is clamped on the second indenter 123 and the metal base 13.
Step three: the excitation signal is generated on the bottom plate 111 of the support 11 by excitation signal generating means.
Specifically, the excitation signal may be generated by a lead breaking, ball falling or signal generator 21, and in this embodiment, the excitation signal generating device is implemented by the signal generator 21 and the piezoceramic sensor 22 connected to each other, so that the excitation signal is generated by the signal generator 21 and transmitted to the piezoceramic sensor 22, and the piezoceramic sensor 22 converts the voltage signal into a mechanical output, thereby generating the excitation signal on the base plate 111.
Step four: the excitation signal is transmitted to the piezoelectric polymer sample 200 to be measured by the base plate 111, and the piezoelectric polymer sample 200 to be measured is made to generate a voltage response.
Step five: the voltage response generated by the piezoelectric polymer sample 200 to be tested is amplified by the pre-amplifier 33 and then transmitted to the signal acquisition device, so that the response performance of the piezoelectric polymer sample to be tested to the acoustic emission signal is analyzed, namely, the signal is amplified by the pre-amplifier 33 and then transmitted to the acoustic emission signal acquisition instrument 31, and the voltage response signal acquired by the acoustic emission signal acquisition instrument 31 is displayed by the display 32, so that the response performance of the piezoelectric polymer sample 200 to be tested to the acoustic emission signal is analyzed.
It is to be understood that the above embodiments are merely illustrative of the application of the principles of the present invention, but not in limitation thereof. Various modifications and improvements may be made by those skilled in the art without departing from the spirit and substance of the invention, and are also considered to be within the scope of the invention.

Claims (8)

1. The system for rapidly testing the acoustic emission response performance of the piezoelectric material is characterized by comprising a testing device, an excitation signal generating device and a signal acquisition system; the testing device comprises a supporting seat, a metal pressure head, a metal base and a spring, wherein the supporting seat comprises a bottom plate and a support, the support is arranged on the bottom plate, the metal base is arranged on the bottom plate, the metal pressure head is in an inverted H shape and comprises a first pressure head, a connecting rod and a second pressure head, the two ends of the connecting rod after passing through the support are respectively connected with the first pressure head and the second pressure head, the second pressure head is in pressure connection with the metal base, and the spring with the two ends respectively abutted against the second pressure head and the support is sleeved on the connecting rod;
the excitation signal generating device acts on the bottom plate to generate an excitation signal, and the signal acquisition system is respectively and electrically connected with the metal pressure head and the metal base; the supporting seat is made of an insulating material; the signal acquisition system comprises a signal acquisition device and a pre-amplifier, wherein the signal acquisition device is an acoustic emission signal acquisition instrument or an oscilloscope.
2. The system for rapidly testing acoustic emission response performance of piezoelectric materials according to claim 1, wherein the support of the support base is L-shaped and/or the base plate and the support are integrally formed.
3. The system for rapidly testing acoustic emission response properties of a piezoelectric material according to claim 1, wherein the support is made of plexiglas, phenolic resin or fiber reinforced composite material.
4. The system for rapidly testing acoustic emission response performance of piezoelectric materials according to claim 1, wherein the signal acquisition device is connected with the output end of the preamplifier through a coaxial cable, and the input end of the preamplifier is connected with the metal pressure head and the metal base through the coaxial cable respectively.
5. The system for rapidly testing acoustic emission response performance of piezoelectric materials according to claim 1, wherein the excitation signal generating device comprises a signal generator and a piezoelectric ceramic sensor, the signal generator is electrically connected with the piezoelectric ceramic sensor, and the piezoelectric ceramic sensor is mounted on the bottom plate.
6. The system for rapidly testing acoustic emission response properties of a piezoelectric material according to claim 5, wherein the piezoelectric ceramic sensor is bonded to the substrate.
7. A method for rapidly testing acoustic emission response performance of a piezoelectric material, which is realized by the system for rapidly testing acoustic emission response performance of a piezoelectric material according to claim 1, and specifically comprises the following steps:
A. the signal acquisition system is electrically connected with the metal pressure head and the metal base respectively;
B. clamping a piezoelectric polymer sample to be tested on the second pressure head and the metal base;
C. generating an excitation signal on a bottom plate of the supporting seat through an excitation signal generating device;
D. transmitting an excitation signal to a piezoelectric polymer sample to be tested by a bottom plate, and enabling the piezoelectric polymer sample to be tested to generate voltage response;
E. and the signal acquisition system acquires a voltage response signal generated by the piezoelectric polymer sample, so that the response performance of the piezoelectric polymer sample to be tested to the acoustic emission signal is analyzed.
8. The method according to claim 7, wherein in the step C, the excitation signal may be generated by a lead breaking, ball drop or signal generator, and/or the signal acquisition system comprises a signal acquisition device and a preamplifier, and the step E specifically comprises: the voltage response generated by the piezoelectric polymer sample to be tested is amplified by the preamplifier and then transmitted to the signal acquisition device, so that the response performance of the piezoelectric polymer sample to be tested to the acoustic emission signal is analyzed.
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