CN210982082U - Detection apparatus for coating crack initiation toughness - Google Patents
Detection apparatus for coating crack initiation toughness Download PDFInfo
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- CN210982082U CN210982082U CN201921733358.XU CN201921733358U CN210982082U CN 210982082 U CN210982082 U CN 210982082U CN 201921733358 U CN201921733358 U CN 201921733358U CN 210982082 U CN210982082 U CN 210982082U
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Abstract
A device for detecting the cracking toughness of a coating comprises an acoustic emission processing module and an impact test module; the impact test module performs an impact test of the coating. And the acoustic emission processing module detects the acoustic emission energy of the coating impacted by the drop hammer. The acoustic emission processing module comprises an acoustic emission sensor (15), a preamplifier (17), a data acquisition processor (19) and a display (21). The impact test module comprises a top plate (1), a steel wire rope (2), an electromagnet (3), a steel ball pressure head (4), a protective cover (5), a support frame (6), a pressing plate (8), an objective table (9), a bottom plate (10), a base (11), a transverse moving button (13) and a longitudinal moving button (14). The utility model discloses the device, it is convenient to implement, easy operation easily realizes the detection of coating fracture toughness, has the function perfect, and detection efficiency is high is showing the advantage.
Description
Technical Field
The utility model relates to a detection apparatus for coating fracture toughness belongs to coating detection technology field.
Background
Impact performance is an important indicator for evaluating safety, reliability and effectiveness during loading. The impact cracking behaviour of coatings has been a difficult point to study, and the damage mechanism with respect to the analysis of their cracking is of crucial importance for the production of alloy coatings with excellent service performance. At present, the impact toughness of common impact experiment devices is evaluated according to the observation of the surface and the interface of a coating sample, the cracking condition of the interface cannot be monitored in real time, and the defects of high analysis cost, long detection period and the like exist.
Publication No. CN109283085 discloses a coating material thermal shock performance detection experimental device and an experimental auxiliary device thereof, and comprises a transfer device for transferring a workpiece coated with a coating material back and forth at a heating station and a water quenching station; the transfer device comprises a support frame and an automatic rotating device arranged on the support frame, wherein a clamping device for clamping a workpiece is arranged on a rotating shaft of the automatic rotating device. But the device cannot detect the toughness and the cracking condition of the coating.
Disclosure of Invention
The utility model aims at providing a, in order to monitor the coating interface fracture condition fast, confirm coating fracture toughness, provide a detection device of coating fracture toughness.
Realize the technical scheme of the utility model as follows, a detection apparatus of coating fracture toughness, including acoustic emission processing module and impact test module. The impact test module performs an impact test of the coating; and the acoustic emission processing module detects the acoustic emission energy of the coating impacted by the drop hammer.
The acoustic emission processing module comprises an acoustic emission sensor, a preamplifier, a data acquisition processor and a display; the acoustic emission sensor is connected with the input end of the preamplifier; the output end of the preamplifier is connected with the input end of the data acquisition processor; the output end of the data acquisition processor is connected with the display.
The impact test module comprises a top plate, a steel wire rope, an electromagnet, a steel ball pressure head, a protective cover, a supporting frame, a pressing plate, an objective table, a bottom plate, a base, a transverse moving button and a longitudinal moving button; the protective cover is arranged on the bottom plate through a supporting frame; the protective cover is vertically installed, a top plate is arranged at the upper end of the protective cover, and a measuring scale is carved on the wall of the protective cover; a steel wire rope is arranged in the center below the top plate, and an electromagnet is arranged below the steel wire rope; an objective table is arranged at the center below the protective cover; a transverse moving button and a longitudinal moving button are arranged on the side edge of the objective table, a pressing plate is arranged on the objective table, and the acoustic emission sensor is also arranged on the side edge of the objective table; the whole set of impact test module including the base plate is placed on the base.
The acoustic emission sensor is used for receiving stress waves of the coating sample caused by impact of the steel ball press; the preamplifier is used for amplifying the acoustic emission signal; the data acquisition processor is used for processing the acoustic emission signals; the display is used to display the detected energy count.
The electromagnet is used for sucking or releasing the steel ball pressure head and carrying out an impact test on the coating sample; the transverse moving button and the longitudinal moving button are used for adjusting the horizontal position of the objective table, changing the impact position and conveniently carrying out repeated tests.
The steel wire rope can be stretched and contracted through control and is used for controlling the steel ball pressure head and adjusting the height by referring to the measuring scale so as to change the impact energy.
The protective cover is used for safety protection during impact experiments; the coating sample was fixed on the stage by a platen.
The utility model discloses an theory of operation as follows, the impact test module carries out the impact test, and the steel ball pressure head is attracted by the electro-magnet, and when the steel ball pressure head was attracted the take the altitude, the electro-magnet lost the electricity, and the steel ball pressure head falls and assaults the experiment, and experiment back electro-magnet 3 attracts steel ball pressure head 4 once more to set for the height. When the impact energy is changed, the height of the steel ball pressure head needs to be adjusted by means of a measuring scale. After the sample is subjected to an impact experiment, the acoustic emission sensor receives an acoustic emission signal caused by stress waves, the signal is amplified by the preamplifier, the acoustic reflection signal is processed by the data acquisition processor, and finally the energy detected by the analysis of the recording and displaying system is counted. After the experiment of every time falling hammer, accessible lateral shifting button and vertical shifting button change the position that the experiment was strikeed to the falling hammer next time, conveniently carry out the repetition test many times.
The beneficial effects of the utility model are that, the utility model discloses based on the sound emission in the intact and different principles of energy meter under the condition of ftractureing of coating in order to reach the purpose of confirming the coating fracture toughness, it is perfect to have the function, and detection efficiency is high is showing the advantage. The utility model discloses the device, it is convenient to implement, easy operation, it is reliable still to have the detection principle, the experimental apparatus's of being convenient for popularization and application easily to realize.
Drawings
FIG. 1 is a schematic structural view of a device for detecting cracking toughness of a coating according to the present invention;
in the drawings, 1 is a top plate; 2 is a steel wire rope; 3 is an electromagnet; 4 is a steel ball pressure head; 5 is a protective cover; 6 is a support frame; 7 is a sample; 8 is a platen; 9 is an object stage; 10 is a base plate; 11 is a base; 12 is a measuring tape; 13 is a lateral movement button; 14 is a longitudinal movement button; 15 is an acoustic emission sensor; 16 is a wire; 17 is a preamplifier; 18 is a wire; 19 is a data acquisition processor; 20 is a wire; and 21 is a display.
Detailed Description
The specific embodiment of the present invention is shown in fig. 1. FIG. 1 is a schematic structural diagram of an experimental apparatus for realizing cracking toughness of a coating provided by the present invention,
the device for detecting the cracking toughness of the coating comprises a top plate 1, a steel wire rope 2, an electromagnet 3, a steel ball pressure head 4, a protective cover 5, a support frame 6, a sample 7, a pressure plate 8, an objective table 9, a bottom plate 10, a base 11, a measuring scale 12, a transverse moving button 13, a longitudinal moving button 14, an acoustic emission sensor 15, a lead 16, a preamplifier 17, a lead 18, a data acquisition processor 19, a lead 20 and a display 21.
The steel ball pressure head 4 is attracted by the electromagnet 3, when the steel ball pressure head is attracted to a certain height by the electromagnet, the electromagnet is powered off, and the steel ball pressure head falls down to perform an impact experiment; the energy released after impact generates elastic waves, the acoustic emission sensor 15 receives the generated elastic wave signals and converts the elastic wave signals into electric signals, the electric signals are output to the preamplifier 17, the electric signals are amplified by the preamplifier 17 and then processed by the signal acquisition processor 19, and finally the energy count obtained by analysis is recorded and displayed by the display 21. Each time a particular altitude is reached, an energy count number is displayed. The energy count reflects the energy released by the coating sample undergoing elastoplastic deformation upon impact.
When the impact energy is changed, the height of the steel ball pressure head is required to be adjusted by means of the measuring scale 12; after the experiment, the electromagnet 3 attracts the steel ball pressure head 4 to the set height again, and the experiment is carried out again. After each drop hammer experiment, the position of the next drop hammer impact experiment can be changed through the transverse moving button 13 and the longitudinal moving button 14, and repeated experiments can be conveniently carried out.
The device of the embodiment detects the cracking toughness of the coating, and specifically operates as follows:
(1) various coating samples were prepared by a spray coating process.
(2) And fixing the pressure plate on an objective table to well test the coating, performing a drop hammer impact test on a steel ball pressure head with the mass of m from low height, and recording the energy count of the acoustic emission detection at the moment.
(3) The impact position is changed by moving the button transversely and longitudinally, the height of the drop hammer is raised, and the energy count of the acoustic emission detection is recorded.
(4) When the energy of acoustic emission detection is increased until the energy is stable, the corresponding drop hammer height at the beginning of a stable state is h, and then the mass m of the falling steel ball pressure head and the falling acceleration g of the steel ball pressure head are multiplied, so that the fracture initiation toughness value mgh can be obtained.
(5) The impact position is changed by moving the button transversely and longitudinally, and the process is repeated for a plurality of times to obtain the fracture toughness value.
The design concept of the steps is as follows: the acoustic emission records different energy counts for the coating in intact and cracked conditions, so that the crack initiation toughness of the coating can be determined from the change in the energy counts.
Claims (7)
1. The device for detecting the cracking toughness of the coating is characterized by comprising an acoustic emission processing module and an impact testing module; the impact test module performs an impact test of the coating; and the acoustic emission processing module detects the acoustic emission energy of the coating impacted by the drop hammer.
2. The apparatus for detecting the cracking toughness of a coating according to claim 1, wherein said acoustic emission processing module comprises an acoustic emission sensor, a preamplifier, a data acquisition processor and a display; the acoustic emission sensor is connected with the input end of the preamplifier; the output end of the preamplifier is connected with the input end of the data acquisition processor; the output end of the data acquisition processor is connected with the display.
3. The device for detecting the cracking toughness of the coating, according to claim 1, wherein the impact test module comprises a top plate, a steel wire rope, an electromagnet, a steel ball pressure head, a protective cover, a supporting frame, a pressing plate, an object stage, a bottom plate, a base, a transverse moving button and a longitudinal moving button; the protective cover is arranged on the bottom plate through a supporting frame; the protective cover is vertically installed, a top plate is arranged at the upper end of the protective cover, and a measuring scale is carved on the wall of the protective cover; a steel wire rope is arranged in the center below the top plate, and an electromagnet is arranged below the steel wire rope; an objective table is arranged at the center below the protective cover; a transverse moving button and a longitudinal moving button are arranged on the side edge of the objective table, a pressing plate is arranged on the objective table, and the acoustic emission sensor is also arranged on the side edge of the objective table; the whole set of impact test module including the base plate is placed on the base.
4. The apparatus of claim 1, wherein the acoustic emission processing module detects the cracking toughness of the coating by using computer-detected energy counts.
5. The device for detecting the cracking toughness of the coating according to claim 2, wherein the acoustic emission sensor is used for receiving stress waves of the coating sample caused by impact of a steel ball press; the preamplifier is used for amplifying the acoustic emission signal; the data acquisition processor is used for processing the acoustic emission signals; the display is used to display the detected energy count.
6. The device for detecting the cracking toughness of the coating according to claim 3, wherein the electromagnet is used for sucking or releasing the steel ball pressure head to perform an impact test on the coating sample; the transverse moving button and the longitudinal moving button are used for adjusting the horizontal position of the objective table, changing the impact position and conveniently carrying out repeated tests.
7. The device for detecting the cracking toughness of the coating according to claim 3, wherein the steel wire rope is used for controlling the steel ball pressure head and adjusting the height by referring to the measuring scale so as to change the impact energy.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921733358.XU CN210982082U (en) | 2019-10-16 | 2019-10-16 | Detection apparatus for coating crack initiation toughness |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921733358.XU CN210982082U (en) | 2019-10-16 | 2019-10-16 | Detection apparatus for coating crack initiation toughness |
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| CN210982082U true CN210982082U (en) | 2020-07-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114544782A (en) * | 2022-02-28 | 2022-05-27 | 天津大学 | Sensor calibration device based on embedded PVDF piezoelectric film and calibration method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114544782A (en) * | 2022-02-28 | 2022-05-27 | 天津大学 | Sensor calibration device based on embedded PVDF piezoelectric film and calibration method thereof |
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