Ultrasonic imaging device for compression strength of laminated board opening

Abstract

The invention discloses a laminated board trepanning compression strength ultrasonic imaging device which comprises an ultrasonic imaging assembly and a laminated board clamp assembly. The laminated board clamp assembly comprises a first clamp assembly and a second clamp assembly which are oppositely arranged, a windowing observation opening is formed in the first clamp assembly and / or the second clamp assembly, and a laminated board sample is locked and fixed between the first clamp assembly and the second clamp assembly; the ultrasonic imaging assembly comprises an ultrasonic probe and a wedge block assembly; the wedge block assembly comprises a T-shaped wedge block and a rubber sheath, the T-shaped wedge block comprises a cylindrical section matched with the windowing observation opening, a top plate is arranged at the first end of the cylindrical section, and the ultrasonic probe is attached to the top plate and enables ultrasonic waves to vertically enter the T-shaped wedge block; the cylindrical section is sleeved with the rubber sheath, the rubber sheath wraps the end face and the outer wall of the second end of the cylindrical section, a sound cavity is formed between the rubber sheath and the cylindrical section, and the sound cavity is connected with the ultrasonic coupling agent circulation pressure maintaining system; the cylindrical section extends into the windowing observation opening and enables the rubber sheath to be attached to the laminated board.

Description

Technical Field

[0001] The invention belongs to the technical field of ultrasonic nondestructive testing, and specifically relates to an ultrasonic imaging device for the compressive strength of a laminate opening. Background Art

[0002] Advanced composite materials are widely used in primary and secondary structural parts of the aerospace industry due to their high specific strength, high specific stiffness, excellent tolerance in environments such as high temperature, fatigue and corrosion, shock absorption and damage resistance, safety and reliability, and strong designability. As the use of composite materials in aerospace structures continues to increase, the stability and reliability of composite structures directly affect the safe, efficient and long-term operation of aerospace structures. Currently, since mechanical fasteners such as rivets, pins and bolts are commonly used to connect composite laminates, open-hole compression tests are required to determine the ultimate compressive strength of the laminate, the ratio of the specimen passing through the hole to the hole diameter, and the bending percentage. ASTM D6484 is a test standard for measuring the open-hole compressive strength of multi-directional polymer-based composite laminates.

[0003] ASTM D6484 has two different test procedures. In Procedure A, the laminate surface is supported by a bolted test fixture, the end of which is clamped in a hydraulic wedge fixture to transmit force in a shear manner. In Procedure B, the compression plate needs to compress the specimen in the end-loaded test fixture. During the test, the laminate sample is squeezed by a hydraulic press to apply a compressive force to the laminate sample until the laminate sample fails. During the test, the entire failure process is visually observed through the window observation port, the laminate sample is removed to observe the fracture morphology and structure, and the relevant hydraulic pressure is recorded. These data are then used to analyze and confirm the open-hole compression strength of the multi-directional polymer-based composite laminate.

[0004] However, unlike metal materials, composite materials contain a large number of nonlinear and dispersed structural factors, making the strength and failure modes of the structure itself difficult to predict. In addition, damage to composite materials is hidden, and many damage conditions, such as delamination damage caused by impact and internal microcracks, cannot be judged and analyzed through external observation. Therefore, the current testing method has the following shortcomings: (1) There are a large number of nonlinear and dispersed structural factors inside the composite material. The strength of the structure itself and the failure mode are difficult to predict. Many damage conditions, such as delamination damage caused by impact and internal microcracks, cannot be judged and analyzed through external observation.

[0005] (2) If there are tiny cracks and damages inside the composite laminate sample to be tested, it will have a great impact on the accuracy of the entire test result. Generally, in order to improve the accuracy of the test results, it is necessary to prepare multiple samples for multiple tests.

[0006] (3) During the test, a series of process change data such as crack generation and crack expansion cannot be monitored in real time. Instead, the product can only be analyzed and studied by observing the fracture surface after the test is completed and the product fails. Summary of the Invention

[0007] In view of this, the purpose of the present invention is to provide an ultrasonic imaging device for the compressive strength of laminate openings, which can study the interaction between various parameters of the laminate and analyze the failure mechanism, so as to better guide the processing and design of composite laminates.

[0008] In order to achieve the above object, the present invention provides the following technical solutions: An ultrasonic imaging device for laminate opening compression strength includes an ultrasonic imaging assembly and a laminate clamp assembly; The laminate clamp assembly includes a first clamp assembly and a second clamp assembly arranged opposite to each other, the first clamp assembly and / or the second clamp assembly is provided with a window observation port, a laminate sample is locked and fixed between the first clamp assembly and the second clamp assembly, and the circular hole provided on the laminate sample is located in the window observation port; The ultrasonic imaging assembly includes an ultrasonic probe and a wedge assembly; the ultrasonic probe is connected to an ultrasonic excitation system and an ultrasonic signal acquisition system, and the ultrasonic excitation system and the ultrasonic signal acquisition system are connected to an ultrasonic signal processing imaging system; The wedge assembly includes a T-shaped wedge and a rubber sheath. The T-shaped wedge includes a cylindrical section adapted to the window observation port. A top plate is provided at the first end of the cylindrical section. The ultrasonic probe is attached to the top plate so that ultrasonic waves are vertically incident on the T-shaped wedge. The rubber sheath is sleeved over the cylindrical section and wraps around the second end surface and outer wall of the cylindrical section, forming an acoustic cavity between the rubber sheath and the cylindrical section. The acoustic cavity is connected to an ultrasonic coupling agent circulation and pressure maintaining system. The cylindrical section extends into the windowed viewing port and allows the rubber sheath to fit the laminate.

[0009] Furthermore, there is a gap between the bottom surface of the cylindrical segment and the two opposite ends located in the first direction and the rubber sheath to form the sound cavity, and the two opposite ends of the cylindrical segment located in the second direction are tightly fitted with the rubber sheath; the first direction and the second direction are perpendicular to each other, and both the first direction and the second direction are perpendicular to the axis of the cylindrical segment.

[0010] Furthermore, the area of ​​the rubber sheath corresponding to the bottom surface of the cylindrical section is a thin-walled area.

[0011] Furthermore, a water valve connector is installed on the rubber sheath, the inner end of the water valve connector is communicated with the acoustic cavity, and the outer end is connected to the coupling agent tube.

[0012] Furthermore, the ultrasonic probe adopts an ultrasonic array probe, and the ultrasonic array probe adopts a two-dimensional array chip arrangement so that the distance for the sound beam emitted by each channel to reach the laminate sample is equal.

[0013] Furthermore, the first fixture assembly includes a first laminating plate, a first extrusion plate and a first supporting plate, and the first laminating plate is fixedly connected to the first extrusion plate; The second clamp assembly includes a second laminating plate, a second extrusion plate and a second support plate, and the second laminating plate is fixedly connected to the second extrusion plate; The first laminating plate and the second laminating plate are respectively laminated to the two side surfaces of the laminate sample, and the first extruded plate and the second extruded plate are respectively located at the two ends of the laminate sample; the first supporting plate is fixedly mounted on the first extruded plate and slidably cooperates with the second laminating plate, and the second supporting plate is mounted on the second extruded plate and slidably cooperates with the first laminating plate; The window observation port is arranged on the first bonding plate and / or the second bonding plate.

[0014] Furthermore, a first pad is provided between the first support plate and the first extrusion plate, and a second pad is provided between the second support plate and the second extrusion plate.

[0015] Furthermore, the first extruded plate is provided with a first protrusion protruding toward the laminate sample at one end facing the laminate sample, and a first recessed portion is provided on the first plywood corresponding to the first protrusion; and / or, the second extruded plate is provided with a second protrusion protruding toward the laminate sample at one end facing the laminate sample, and a second recessed portion is provided on the second plywood corresponding to the second protrusion.

[0016] Furthermore, the wedge block assembly also includes a U-shaped mounting frame, the closed end of the U-shaped mounting frame is sleeved outside the rubber sheath, and the open end of the U-shaped mounting frame is installed with an L-shaped connecting plate, the first end of the L-shaped connecting plate is fixedly connected to the T-shaped wedge block or the rubber sheath, and the second end is fixedly connected to the first bonding plate or the second bonding plate; the outer peripheral wall of the rubber sheath is provided with a groove that cooperates with the closed end of the U-shaped mounting frame.

[0017] Furthermore, the top of the rubber sheath is fixedly connected to the top plate; the rubber sheath is fitted with the inner wall of the window observation port, and the outer wall of the rubber sheath is provided with a limiting step that limits the corresponding first fitting plate or second fitting plate.

[0018] The beneficial effects of the present invention are: The ultrasonic imaging device for compressive strength of laminate openings of the present invention aims at detecting the compressive strength of laminate openings of multi-directional polymer-based composite materials. By setting a laminate clamping assembly, on the one hand, the laminate sample can be locked and fixed, and on the other hand, an extrusion force can be applied to the laminate in combination with external hydraulic presses and other equipment; by setting an ultrasonic imaging assembly, and connecting an ultrasonic excitation system, an ultrasonic signal acquisition system and an ultrasonic signal processing imaging system to the ultrasonic probe, and a rubber sheath is sleeved on the cylindrical section of the T-shaped wedge to form an acoustic cavity, and an ultrasonic coupling agent circulating pressure maintaining system is connected to the acoustic cavity; in this way, the cylindrical section is extended into the window observation port and the rubber sheath is fitted with the laminate, and the ultrasonic imaging assembly can be used to perform ultrasonic imaging on the laminate sample. Specifically: before applying extrusion force to the laminate sample, the ultrasonic imaging assembly can be used to The pressed plate sample is scanned to detect whether there are tiny cracks and damage inside the laminate sample. If the laminate sample is unqualified, the unqualified sample can be replaced in advance; in the process of testing the laminate sample, an extrusion pressure is applied to the laminate sample until the laminate sample fails and breaks, and the ultrasonic imaging component is used to collect and process the ultrasonic data of the laminate sample at different stages under the action of the extrusion pressure in real time. It can monitor a series of process change data such as crack generation and crack expansion of the laminate sample during the test in real time, which can not only detect the delamination damage, internal microcracks and other damage caused by the extrusion pressure of the laminate sample, but also realize the analysis and research of the failure process, so as to study the law of interaction between the various parameters of the laminate and analyze the failure mechanism, so as to better guide the processing and design of composite laminates. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to make the purpose, technical solutions and beneficial effects of the present invention more clear, the present invention provides the following drawings for illustration: Figure 1 A schematic structural diagram of an embodiment of an ultrasonic imaging device for laminate opening compression strength according to the present invention; Figure 2 is a schematic structural diagram of an ultrasound imaging component; Figure 3 Schematic diagram of the structure of the laminate clamping assembly.

[0020] Description of reference numerals: 10 - Ultrasonic imaging assembly; 11 - Ultrasonic probe; 111 - Piezoelectric wafer; 112 - Matching layer; 113 - Backing; 114 - Cable; 115 - Housing; 12 - Ultrasonic excitation system; 13 - Ultrasonic signal acquisition system; 14 - Ultrasonic signal processing and imaging system; 15 - T-shaped wedge; 151 - Column segment; 152 - Top plate; 16 - Rubber sheath; 17 - Acoustic cavity; 18 - Ultrasonic couplant circulation and pressure-maintaining system; 181 - Water valve connector; 182 - Couplant tube; 19 - U-shaped mounting frame; 191 - Closed end; 192 - Open end; 193 - L-shaped connecting plate; 20 - laminate fixture assembly; 21 - window observation port; 22 - first laminating plate; 221 - first recessed portion; 23 - first extrusion plate; 231 - first protrusion; 24 - first support plate; 25 - second laminating plate; 26 - second extrusion plate; 27 - second support plate; 28 - first pad; 29 - second pad; 30-Laminate sample; 31-Threaded fastener. DETAILED DESCRIPTION

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it. However, the embodiments are not intended to limit the present invention.

[0022] like Figure 1 As shown, the laminate opening compressive strength ultrasonic imaging device of this embodiment includes an ultrasonic imaging component 10 and a laminate clamp component 20.

[0023] Specifically, the laminate clamp assembly 20 of this embodiment includes a first clamp assembly and a second clamp assembly that are relatively arranged. A window observation port 21 is provided on the first clamp assembly and / or the second clamp assembly. A laminate sample 30 is locked and fixed between the first clamp assembly and the second clamp assembly, and a circular hole 31 provided on the laminate sample 30 is located in the window observation port 21.

[0024] The ultrasonic imaging assembly 10 of this embodiment includes an ultrasonic probe 11 and a wedge assembly. Specifically, the ultrasonic probe 11 is connected to an ultrasonic excitation system 12 and an ultrasonic signal acquisition system 13. The ultrasonic excitation system 12 and the ultrasonic signal acquisition system 13 are connected to an ultrasonic signal processing and imaging system 14. Specifically, the ultrasonic excitation system 12 excites the ultrasonic probe to generate ultrasonic waves, the signal acquisition system 13 receives the reflected echo signal from the ultrasonic probe 11, and the signal processing and imaging system 14 processes the echo signal and performs graphic imaging analysis. Specifically, the ultrasonic probe 11 includes a piezoelectric chip 111, a matching layer 112, a backing 113, a cable 114, a housing 115, and a plug. In this embodiment, the ultrasonic probe 11 is an ultrasonic array probe, which uses a two-dimensional array chip arrangement to ensure that the distance from each channel to the laminate sample is equal. Specifically, in this embodiment, the center frequency of the ultrasonic probe 11 is 5 MHz, the number of channels is 16 rows and 8 columns, totaling 128 array elements, with a row spacing of 1.0 mm and a column spacing of 1.0 mm.

[0025] The wedge assembly of this embodiment includes a T-shaped wedge 15 and a rubber sheath 16. The T-shaped wedge 15 includes a cylindrical section 151 adapted to fit the windowed observation port 21. A top plate 152 is provided at the first end of the cylindrical section 151. The ultrasonic probe 11 is attached to the top plate 152 so that ultrasonic waves are incident vertically into the T-shaped wedge 15. The rubber sheath 16 is sleeved over the cylindrical section 151 and wraps around the second end face and outer wall of the cylindrical section 151. An acoustic cavity 17 is formed between the rubber sheath 16 and the cylindrical section 151. The acoustic cavity 17 is connected to an ultrasonic coupling agent circulation and pressure-maintaining system 18. In this embodiment, the T-shaped wedge 15 is made of a polymer compound material. Preferably, the polymer compound material can be polystyrene, organic glass, polyimide, etc. The T-shaped wedge 15 of this embodiment is made of polystyrene. In this embodiment, the cylindrical section 151 is in the shape of a square column, and the top plate 152 extends in a direction perpendicular to the axis of the cylindrical section 151 and forms a top surface with an area larger than the cross-sectional area of ​​the cylindrical section 151 .

[0026] In this embodiment, the cylindrical section 151 extends into the window viewing port 21 and allows the rubber sheath 16 to fit the laminate 30 .

[0027] Thus, the laminate opening compressive strength ultrasonic imaging device of this embodiment addresses the problem of testing the opening compressive strength of multi-directional polymer-based composite laminates. By providing a laminate clamping assembly 20, the laminate sample 30 can be locked and fixed, and an external hydraulic press or other equipment can be used to apply a compressive force to the laminate 30. The ultrasonic imaging assembly 10 is provided, and an ultrasonic excitation system 12, an ultrasonic signal acquisition system 13, and an ultrasonic signal processing imaging system 14 are connected to the ultrasonic probe 11. A rubber sheath 16 is provided on the cylindrical section 151 of the T-shaped wedge 15 to form an acoustic cavity 17, and an ultrasonic coupling agent circulation pressure maintenance system 18 is connected to the acoustic cavity 17. In this way, the cylindrical section 151 is extended into the window observation port 21 and the rubber sheath 16 is fitted with the laminate 30, and the ultrasonic imaging component 10 can be used to perform ultrasonic imaging on the laminate sample 30. Specifically: before applying the extrusion force to the laminate sample 30, the laminate sample 30 can be scanned by the ultrasonic imaging component 10 to detect whether there are tiny cracks and damages inside the laminate sample 30. If the laminate sample 30 is unqualified, the unqualified sample can be replaced in advance; in the process of testing the laminate sample 30, the extrusion force is applied to the laminate sample 30 until the laminate sample 30 is unqualified. 30 fails and fractures, and the ultrasonic imaging component 10 is used to collect and process the ultrasonic data of the laminate sample 30 at different stages under the extrusion pressure in real time, so that a series of process change data such as the generation and expansion of cracks in the laminate sample 30 during the test can be monitored in real time. It can not only detect the delamination damage, internal microcracks and other damages caused by the extrusion pressure of the laminate sample 30, but also analyze and study the failure process, so as to study the law of interaction between the various parameters of the laminate and analyze the failure mechanism, so as to better guide the processing and design of composite laminates.

[0028] Specifically, in this embodiment, the first clamp assembly includes a first laminating plate 22, a first extrusion plate 23 and a first support plate 24, and the first laminating plate 22 is fixedly connected to the first extrusion plate 23. The second clamp assembly includes a second laminating plate 25, a second extrusion plate 26 and a second support plate 27, and the second laminating plate 25 is fixedly connected to the second extrusion plate 26. The first laminating plate 22 and the second laminating plate 25 are respectively laminated to the side surfaces of the laminate sample 30, and the first extrusion plate 23 and the second extrusion plate 26 are respectively located at the two ends of the laminate sample 30; the first support plate 24 is fixedly mounted on the first extrusion plate 23 and slidably cooperates with the second laminating plate 25, and the second support plate 27 is mounted on the second extrusion plate 26 and slidably cooperates with the first laminating plate 22. In this embodiment, a first pad 28 is provided between the first support plate 24 and the first extrusion plate 23, and a second pad 29 is provided between the second support plate 27 and the second extrusion plate 28. The window observation port 21 is provided on the first plywood 22 and / or the second plywood 25. In this embodiment, the first plywood 22 and the second plywood 25 are provided with the window observation port 21 respectively. Of course, in some other embodiments, the window observation port 21 can also be provided only on the first plywood 22 or only on the second plywood 25, which will not be repeated here. In this way, by driving the first clamp assembly and the second clamp assembly to move in a direction parallel to the two side surfaces of the laminate sample 30, the first plywood 22 and the second plywood 25 can apply a friction force parallel to the two side surfaces of the laminate sample 30. At the same time, the first extrusion plate 23 and the second extrusion plate 26 can apply an extrusion force to the two ends of the laminate sample 30 respectively. Under the combined action of the friction force and the extrusion force, the laminate sample 30 is deformed until it breaks, which can meet the test requirements of the laminate opening compression strength.

[0029] In a preferred implementation of this embodiment, the end of the first extruded plate 23 facing the laminate sample 30 is provided with a first protrusion 231 protruding toward the laminate sample 30, and the first plywood 22 is provided with a first recessed portion 221 corresponding to the first protrusion 231. And / or, the end of the second extruded plate 26 facing the laminate sample 30 is provided with a second protrusion protruding toward the laminate sample 30, and the second plywood 25 is provided with a second recessed portion corresponding to the second protrusion. It is possible to better achieve the application of local extrusion force to the end of the laminate sample 30. Specifically, in this embodiment, the first extruded plate 23 and the second extruded plate 26 are respectively provided with a first protrusion 231 and a second protrusion. Of course, in some other embodiments, the first protrusion 231 may be provided only on the first extruded plate 23, or the second protrusion may be provided only on the second extruded plate 26.

[0030] In a preferred embodiment of this embodiment, the wedge assembly further includes a U-shaped mounting frame 19. A closed end sleeve 191 of the U-shaped mounting frame 19 is positioned outside the rubber sheath. An L-shaped connecting plate 193 is positioned at the open end 192 of the U-shaped mounting frame 19. The first end of the L-shaped connecting plate 193 is fixedly connected to the T-shaped wedge 15 or the rubber sheath 16, and the second end is fixedly connected to the first bonding plate 22 or the second bonding plate 25. In this embodiment, the outer peripheral wall of the rubber sheath 16 is provided with a groove that mates with the closed end of the U-shaped mounting frame 19. In this embodiment, the first end of the L-shaped connecting plate 193 is fixedly connected to the rubber sheath 16 via a threaded fastener, and the second end is fixedly connected to the first bonding plate 22 via a threaded fastener. In other words, in this embodiment, the portion of the rubber sheath 16 exposed to the windowed viewing port 21 is required to have a certain hardness requirement to meet the requirements of the mounting support. In this embodiment, the Shore A hardness of the portion of the rubber sheath 16 exposed to the windowed viewing port 21 is ≥ 80°. In this manner, the wedge assembly may be secured to the laminate clamp assembly 20 .

[0031] In this embodiment, the rubber sheath 16 and the top plate 152 are positioned in a restrained manner, and the top of the rubber sheath 16 is fixedly connected to the top plate 152 via threaded fasteners, thereby securing the rubber sheath 16 to the T-shaped wedge 15. In this embodiment, the ultrasonic probe 11 is fixedly connected to the top plate 152 via threaded fasteners, ensuring that the ultrasonic probe 11 is in contact with the top surface of the top plate 152. Specifically, the housing 115 of the ultrasonic probe 11 is fixedly connected to the top plate 152 via screws.

[0032] In this embodiment, the rubber sheath 16 is in contact with the inner wall of the windowed observation port 21, and the outer wall of the rubber sheath 16 is provided with a stopper step that is locked with the corresponding first plywood 22 or second plywood 25 to ensure the positioning and installation of the rubber sheath 16. In this embodiment, the rubber sheath 16 is located within the windowed observation port 21 of the first plywood 22, that is, the stopper step is locked with the first plywood 22.

[0033] In a preferred embodiment of this invention, a gap exists between the bottom surface of the cylindrical section 151 and its two opposite ends in the first direction and the rubber sheath 16, forming an acoustic cavity 17. The opposite ends of the cylindrical section 151 in the second direction are tightly fitted with the rubber sheath 16. Specifically, the first and second directions are perpendicular to each other, and both directions are perpendicular to the axis of the cylindrical section 151. Thus, the acoustic cavity 17 comprises a central portion of the cylindrical section 151 and two end portions located at either end of the cylindrical section 151 in the first direction. These two end portions are connected through the central portion to facilitate couplant circulation and pressure maintenance via the ultrasonic couplant circulation and pressure maintenance system 18. Specifically, a water valve connector 181 is mounted on the rubber sheath 16. The inner end of the water valve connector 181 communicates with the acoustic cavity, while the outer end is connected to a couplant tube 182. Specifically, water valve connectors 181 are provided on either end of the acoustic cavity 17 in the second direction, serving as the couplant water inlet and outlet, respectively.

[0034] In the preferred embodiment of this invention, the area of ​​the rubber sheath 16 corresponding to the bottom surface of the cylindrical segment is a thin-walled region. The rubber sheath 16 in this thin-walled region is kept as thin as possible to improve ultrasonic wave transmittance. Specifically, the thickness of the rubber sheath 16 in this thin-walled region is required to be ≤ 0.5 mm. This allows for a certain amount of expansion under the pressure maintained by the ultrasonic coupling agent circulating pressure maintaining system 18, ensuring that the rubber sheath 16 can fully conform to the uneven surface of the composite laminate sample 30. In this embodiment, the distance between the bottom surface of the cylindrical segment 151 and the rubber sheath 16 is 0.3 mm to 2 mm.

[0035] In this embodiment, the coupling agent is an oily liquid substance, preferably degassing engine oil.

[0036] The above embodiments are merely preferred embodiments for the purpose of fully illustrating the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are within the scope of protection of the present invention. The scope of protection of the present invention shall be subject to the claims.

Claims

1. An ultrasonic imaging device for measuring the compressive strength of a laminate opening, characterized by: including an ultrasound imaging assembly and a laminate fixture assembly; The laminate clamp assembly includes a first clamp assembly and a second clamp assembly arranged opposite to each other, the first clamp assembly and / or the second clamp assembly is provided with a window observation port, a laminate sample is locked and fixed between the first clamp assembly and the second clamp assembly, and the circular hole provided on the laminate sample is located in the window observation port; The ultrasonic imaging assembly includes an ultrasonic probe and a wedge assembly; the ultrasonic probe is connected to an ultrasonic excitation system and an ultrasonic signal acquisition system, and the ultrasonic excitation system and the ultrasonic signal acquisition system are connected to an ultrasonic signal processing imaging system; The wedge assembly includes a T-shaped wedge and a rubber sheath. The T-shaped wedge includes a cylindrical section adapted to the window observation port. A top plate is provided at the first end of the cylindrical section. The ultrasonic probe is attached to the top plate so that ultrasonic waves are vertically incident on the T-shaped wedge. The rubber sheath is sleeved over the cylindrical section and wraps around the second end surface and outer wall of the cylindrical section, forming an acoustic cavity between the rubber sheath and the cylindrical section. The acoustic cavity is connected to an ultrasonic coupling agent circulation and pressure maintaining system. The cylindrical section extends into the windowed viewing port and allows the rubber sheath to fit the laminate.

2. The ultrasonic imaging device for laminate opening compressive strength according to claim 1, characterized in that: There is a distance between the bottom surface of the cylindrical segment and the two opposite ends located in the first direction and the rubber sheath to form the sound cavity, and the two opposite ends of the cylindrical segment located in the second direction are tightly fitted with the rubber sheath; the first direction and the second direction are perpendicular to each other, and the first direction and the second direction are both perpendicular to the axis of the cylindrical segment.

3. The ultrasonic imaging device for laminate opening compressive strength according to claim 2, characterized in that: The area of ​​the rubber sheath corresponding to the bottom surface of the cylindrical section is a thin-walled area.

4. The ultrasonic imaging device for laminate opening compressive strength according to claim 2, characterized in that: A water valve connector is installed on the rubber sheath, wherein the inner end of the water valve connector is communicated with the acoustic cavity and the outer end is connected to the coupling agent tube.

5. The ultrasonic imaging device for laminate opening compressive strength according to claim 1, characterized in that: The ultrasonic probe is an ultrasonic array probe, and the ultrasonic array probe is arranged with two-dimensional array chips so that the distance between the acoustic beam emitted by each channel and the laminate sample is equal.

6. The ultrasonic imaging device for laminate opening compressive strength according to any one of claims 1 to 5, characterized in that: The first fixture assembly includes a first laminating plate, a first extrusion plate and a first supporting plate, and the first laminating plate is fixedly connected to the first extrusion plate; The second clamp assembly includes a second laminating plate, a second extrusion plate and a second support plate, and the second laminating plate is fixedly connected to the second extrusion plate; The first laminating plate and the second laminating plate are respectively laminated to the two side surfaces of the laminate sample, and the first extruded plate and the second extruded plate are respectively located at the two ends of the laminate sample; the first supporting plate is fixedly mounted on the first extruded plate and slidably cooperates with the second laminating plate, and the second supporting plate is mounted on the second extruded plate and slidably cooperates with the first laminating plate; The window observation port is arranged on the first bonding plate and / or the second bonding plate.

7. The ultrasonic imaging device for laminate opening compressive strength according to claim 2, characterized in that: A first pad is provided between the first support plate and the first extrusion plate, and a second pad is provided between the second support plate and the second extrusion plate.

8. The ultrasonic imaging device for laminate opening compressive strength according to claim 2, characterized in that: The first extruded plate has an end facing the laminate sample provided with a first protrusion protruding toward the laminate sample, and the first plywood has a first recessed portion corresponding to the first protrusion; and / or the second extruded plate has an end facing the laminate sample provided with a second protrusion protruding toward the laminate sample, and the second plywood has a second recessed portion corresponding to the second protrusion.

9. The ultrasonic imaging device for laminate opening compressive strength according to claim 6, characterized in that: The wedge block assembly also includes a U-shaped mounting frame, the closed end of the U-shaped mounting frame is sleeved outside the rubber sheath, and an L-shaped connecting plate is installed at the open end of the U-shaped mounting frame, the first end of the L-shaped connecting plate is fixedly connected to the T-shaped wedge block or the rubber sheath, and the second end is fixedly connected to the first plywood or the second plywood; the outer peripheral wall of the rubber sheath is provided with a groove that cooperates with the closed end of the U-shaped mounting frame.

10. The ultrasonic imaging device for laminate opening compressive strength according to claim 6, characterized in that: The top of the rubber sheath is fixedly connected to the top plate; the rubber sheath is fitted with the inner wall of the window observation port, and the outer wall of the rubber sheath is provided with a limiting step that limits the corresponding first fitting plate or second fitting plate.

Images