Ultrasonic detection and comparison device for T-shaped stiffened wallboards and preparation method of ultrasonic detection and comparison device

Abstract

The invention provides a T-shaped stiffened wallboard ultrasonic detection and comparison device and a preparation method thereof, the structure of the T-shaped stiffened wallboard ultrasonic detection and comparison device is formed by gluing a T-shaped stringer and a skin, and a group of artificial defects are respectively pre-buried at the interface of the T-shaped stringer and the skin, the interface of a T-shaped stringer twisting area and an R area, and different depth positions of a T-shaped stringer stud and the skin; each group of artificial defects comprises at least three groups of polytetrafluoroethylene sheets with different sizes. The preparation method of the reference block mainly comprises the following steps: unfolding the T-shaped stringer and the skin into a plane pattern, cutting a paving layer material sheet according to the unfolded pattern, paving the T-shaped stringer and pre-burying defects, twisting the T-shaped stringer and pre-burying the defects, carrying out bag making and curing on the T-shaped stringer, paving the skin and pre-burying the defects, preassembling the T-shaped stringer and pre-burying the defects, carrying out bag making and curing on the stiffened plate and the like. When the prepared reference block is used for equipment calibration and defect evaluation of an ultrasonic detection method, the defect part and type of a part can be accurately and quickly detected.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of non-destructive testing of composite materials, and in particular to a T-stiffened panel ultrasonic testing contrast device and a preparation method thereof. BACKGROUND

[0002] With the progress of science and technology, composite T-stiffened panels are increasingly widely used in the field of aerospace. They are formed by bonding the skin and T-stringers through adhesive at high temperature, and have the advantages of light weight, high strength, corrosion resistance, and good fatigue resistance. The skin and T-stringers are both composite laminates. Due to the multiple layers and large thickness of the stiffened panel, defects such as delamination, debonding, and excessive porosity may occur during the preparation process. These defects not only affect the mechanical properties of the part, but also relate to the reliability and safety of the project.

[0003] To improve the efficiency and accuracy of ultrasonic testing, a T-composite stiffened panel ultrasonic testing contrast block can be prepared for calibration and defect evaluation of the testing equipment. Artificial defects are pre-embedded in the contrast block to simulate quality defects such as delamination and debonding. During testing, the ultrasonic testing equipment is used to scan the composite part and the contrast block respectively. Through waveform comparison and analysis, the defect position and type of the part can be quickly and accurately tested, thereby improving the accuracy and efficiency of testing.

[0004] Currently, some patents have proposed contrast blocks for ultrasonic testing and their preparation methods. For example, patent CN113702512A proposes a contrast block for functional honeycomb composite non-destructive testing and its preparation method, which is characterized by pre-setting artificial defects between the adhesive and the skin, and between the adhesive and the honeycomb core. Patent CN113720664B introduces a contrast block manufacturing method for detecting delamination defects in composite laminate structures, which is characterized by designing contrast block drawings based on the detected object, designing and manufacturing artificial defect positioning templates, and then laying and curing the prepreg. There is a lack of a contrast block specifically used for T-stiffened panel ultrasonic testing in the prior art. Therefore, it is urgent to develop a non-destructive contrast block suitable for this structure. SUMMARY

[0005] The present application aims to provide a T-stiffened panel ultrasonic testing contrast device and a preparation method thereof, which is used for calibration and defect evaluation of the ultrasonic testing method, and can solve the problem that the contrast block cannot accurately and quickly detect the defect position and type of the part.

[0006] The purpose of the present application is achieved by the following technical solutions: In a first aspect, the application provides a T-stiffened panel ultrasonic detection contrast device, comprising a T-stringer (1), a skin (2), a glue film (3), a T-stringer twisting area (4), and a polytetrafluoroethylene sheet (5), wherein: The T-stringer (1) is in a T-shaped structure, and the bottom edge of the T-stringer (1) is glued to the skin (2) through the glue film (3). Artificial defects are embedded in the glue joint surface of the T-stringer (1) and the skin (2), the interface between the T-stringer twisting area (4) and the R area, and the glue joint surface of the T-stringer stud and the skin (2), respectively. A group of artificial defects are embedded between the first layer and the second layer on the left side of the T-stringer stud, a group of artificial defects are embedded in the middle layer of the T-stringer stud, and a group of artificial defects are embedded between the outermost layer and the next outer layer on the right side of the T-stringer stud. A group of artificial defects are embedded in the interface between the T-stringer twisting area (4) and the R area on both sides. A group of artificial defects are embedded between the upper surface and the second layer of the skin (2), a group of artificial defects are embedded in the middle layer of the skin (2), and a group of artificial defects are embedded between the outermost layer and the next outer layer of the lower surface of the skin (2). A group of artificial defects are embedded in the upper surface of the glue film at the glue joint surface of the T-stringer (1) and the skin (2), and a group of artificial defects are embedded in the lower surface.

[0007] Preferably, the T-stringer (1) and the skin (2) are glued together through the glue film (3); and the T-stringer (1) and the skin (2) are both composite laminated structures.

[0008] Preferably, the artificial defect material is a polytetrafluoroethylene sheet, including a first polytetrafluoroethylene sheet 51, a second polytetrafluoroethylene sheet 52, a third polytetrafluoroethylene sheet 53, a fourth polytetrafluoroethylene sheet 54, a fifth polytetrafluoroethylene sheet 55, and a sixth polytetrafluoroethylene sheet 56.

[0009] Preferably, each group of artificial defect polytetrafluoroethylene sheets is at least three groups of different sizes, and are placed in a staggered and non-overlapping manner.

[0010] Preferably, the first polytetrafluoroethylene sheet 51, the second polytetrafluoroethylene sheet 52, and the third polytetrafluoroethylene sheet 53 are circular in shape and increase in size in order.

[0011] Preferably, the fourth polytetrafluoroethylene sheet 54, the fifth polytetrafluoroethylene sheet 55, and the sixth polytetrafluoroethylene sheet 56 are rectangular in shape and increase in size in order.

[0012] Preferably, the T-shaped stringer (1) and the skin (2) are pre-pressed once in a hot press tank during the process of laying up the layers of the material pieces.

[0013] Preferably, the pre-pressing pressure is 0.4 Mpa-0.7 Mpa, and the pressure holding time is not less than 30 min.

[0014] In a second aspect, the application provides a preparation method of the T-shaped stiffened panel ultrasonic detection contrast device, which is applied to the T-shaped stiffened panel ultrasonic detection contrast device as described above, and comprises the following steps: Step one, the T-shaped stringer (1) and the skin (2) in the T-shaped stiffened panel ultrasonic detection contrast device are unfolded into planar graphs according to the shapes and sizes of the parts; Step two, the composite material prepreg is cut according to the planar graphs to obtain the T-shaped stringer (1) layer material piece and the skin (2) layer material piece; Step three, the T-shaped stringer (1) layer material piece is laid up according to the design layer, and a group of polytetrafluoroethylene pieces are placed between the first layer and the second layer of the vertical stringer of the T-shaped stringer (1), the middle layer of the T-shaped stringer (1), and the outermost layer and the second outermost layer of the right side of the T-shaped stringer (1); Step four, after the T-shaped stringer (1) is laid up and the film is combined, a group of polytetrafluoroethylene pieces are pre-buried at the junctions of the T-shaped stringer twist area (4) and the two sides R area, and then a twist strip is placed in the twist area; Step five, a vacuum bag is made for the T-shaped stringer (1), the T-shaped stringer (1) is pressurized and solidified in a hot press tank, and then the T-shaped stringer (1) is trimmed after being taken out of the tank; Step six, the skin (2) layer material piece is laid up according to the design layer, and a group of polytetrafluoroethylene pieces are placed between the first layer and the second layer on the upper surface of the skin (2), the middle layer of the skin (2), and the outermost layer and the second outermost layer on the lower surface of the skin (2); Step seven, the T-shaped stringer (1) is pre-assembled, a layer of adhesive film is laid up between the T-shaped stringer (1) and the skin (2), and a group of polytetrafluoroethylene pieces are placed on the upper and lower surfaces of the adhesive film (3); Step eight, after the pre-assembly is completed, a vacuum bag is made, the T-shaped stringer (1) is pressurized and solidified in a hot press tank, and then the T-shaped stringer (1) is trimmed after being taken out of the tank to obtain the T-shaped stiffened panel ultrasonic detection contrast device.

[0015] In summary, the application provides a T-shaped stiffened panel ultrasonic detection contrast device and a preparation method thereof, which has the beneficial effects that: 1. Three different sizes of polytetrafluoroethylene pieces are pre-buried at the positions where defects are prone to occur, such as the junction of the T-shaped stringer and the skin, the junction of the T-shaped stringer twist area and the R area, and the junction of the T-shaped stringer vertical stringer and the skin, so that the defect position distribution is comprehensive and convenient for later detection and analysis.

[0016] 2. By using the comparison test block of the present invention, it is possible to achieve calibration and defect assessment of ultrasonic testing instruments, ensuring the accuracy and reliability of test results.

[0017] 3. A pre-compaction process was added during the paving of the comparison test blocks, which avoided problems such as delamination, debonding and excessive porosity caused by excessive paving, and improved the processing quality of the comparison test blocks. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Cross-sectional diagram showing the distribution of embedded defects in the adhesive joint between the skin and the T-type long stringer Figure 2 Planar diagram of the location distribution of embedded defects in the skin Figure 3 Distribution diagram of defects in pre-embedded reinforcement Figure 4 The distribution diagram of the embedded defects at the interface between the twisting zone and the R zone of the T-type long stringer Figure 5 Cross-sectional view of the embedded defect position at the interface between the twisting zone and the R zone of the T-type long stringer Explanation of numbers in the figure: 1-T-type long stringer, 2-skin, 3-adhesive film, 4-T-type long stringer twisting zone, 5-polytetrafluoroethylene sheet, 51-first polytetrafluoroethylene sheet, 52-second polytetrafluoroethylene sheet, 53-third polytetrafluoroethylene sheet, 54-fourth polytetrafluoroethylene sheet, 55-fifth polytetrafluoroethylene sheet, 56-sixth polytetrafluoroethylene sheet. DETAILED DESCRIPTION

[0019] The technical solution of the present invention is further described in detail below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the following. In order to make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution of the embodiments of the present invention is clearly and completely described below with reference to the accompanying drawings in the present invention. The described embodiment is a part of the embodiment of the present invention, not all of the embodiments.

[0020] Example 1 like Figures 1-5 As shown, the present application provides a T-shaped reinforced wall panel ultrasonic detection and comparison device, comprising a T-shaped long stringer (1), a skin (2), a film (3), a T-shaped long stringer twisting area (4), and a polytetrafluoroethylene sheet (5), wherein: The T-shaped long stringer (1) is a T-shaped structure, and the bottom edge of the T-shaped long stringer (1) is bonded to the skin (2) by means of a film (3); like Figure 1 As shown, artificial defects are pre-embedded at the bonding surface between the T-shaped long stringer (1) and the skin (2), the interface between the twisting zone (4) and the R zone of the T-shaped long stringer, and the bonding surface between the vertical reinforcement of the T-shaped long stringer and the skin (2); A group of artificial defects are embedded between the first and second layers on the left side of the T-shaped long truss reinforcement, a group of artificial defects are embedded in the middle layer of the T-shaped long truss reinforcement, and a group of artificial defects are embedded between the outermost layer and the second outer layer on the right side of the T-shaped long truss reinforcement. Figure 3 This is a schematic diagram of the distribution of artificial defects embedded in the T-shaped long truss reinforcement; like Figures 4-5 As shown, a set of artificial defects are embedded in the interface between the twisting area (4) of the T-shaped long stringer and the R areas on both sides; like Figures 1-2 As shown, a group of artificial defects are embedded between the upper surface of the skin (2) and the second layer, a group of artificial defects are embedded in the middle layer of the skin (2), and a group of artificial defects are embedded between the outermost layer and the second outer layer of the lower surface of the skin (2); A group of artificial defects are embedded in the upper surface of the adhesive film at the adhesive joint surface between the T-shaped long stringer (1) and the skin (2), and a group of artificial defects are embedded in the lower surface of the adhesive film.

[0021] Specifically, the T-shaped long stringer (1) and the skin (2) are bonded together by means of an adhesive film (3).

[0022] Specifically, the T-shaped long stringer (1) and the skin (2) are both composite material laminated structures.

[0023] The twisting zone (4) of the T-shaped long stringer is a corner transition zone where the bottom edge of the long stringer is connected to the vertical reinforcement of the T-shaped long stringer.

[0024] The interface of the R zone is the arc transition area where the T-type long stringer twisting zone (4) is connected to the T-type long stringer vertical reinforcement.

[0025] Furthermore, the artificial defect material is a polytetrafluoroethylene sheet.

[0026] It should be noted that artificial defects are standard defect samples artificially created in a controlled manner during the sample preparation process to simulate defects in composite material parts (such as delamination, inclusions, etc.) and are used to calibrate testing equipment and verify the reliability of testing methods.

[0027] Specifically, the artificial defects include a first polytetrafluoroethylene sheet 51 , a second polytetrafluoroethylene sheet 52 , a third polytetrafluoroethylene sheet 53 , a fourth polytetrafluoroethylene sheet 54 , a fifth polytetrafluoroethylene sheet 55 , and a sixth polytetrafluoroethylene sheet 56 .

[0028] Furthermore, each group of artificial defect polytetrafluoroethylene sheets has at least three groups of sizes, and are staggered and non-overlapping when placed.

[0029] Furthermore, the first polytetrafluoroethylene sheet 51 , the second polytetrafluoroethylene sheet 52 and the third polytetrafluoroethylene sheet 53 are circular in shape and their sizes increase successively, so as to simulate defects of different sizes.

[0030] Further, the fourth polytetrafluoroethylene sheet 54, the fifth polytetrafluoroethylene sheet 55 and the sixth polytetrafluoroethylene sheet 56 are rectangular in shape and increase in size in sequence, and are used to simulate defects of different sizes.

[0031] Further, the pre-compaction pressure is 0.4Mpa-0.7Mpa, and the pressure holding time is not less than 30min.

[0032] Further, the pre-compaction pressure is 0.4Mpa-0.7Mpa, and the pressure holding time is not less than 30min.

[0033] Example two The application provides a preparation method of a T-shaped stiffened wallboard ultrasonic detection comparison device structure, comprising the following steps: Step one, the T-shaped stiffened wallboard ultrasonic detection comparison device is unfolded into a planar graph according to the part shape and size.

[0034] Step two, the composite material prepreg is cut according to the planar graph to obtain T-shaped stringer (1) and skin (2) prepreg; It should be noted that the number of layers and the angle of the prepreg are the same as the design of the T-shaped stiffened wallboard ultrasonic detection comparison device. Step three, the T-shaped stringer (1) prepreg is laid according to the design of the prepreg, and a group of polytetrafluoroethylene sheets are placed between the first layer and the second layer of the T-shaped stringer (1) vertical stiffener, the middle layer of the T-shaped stringer (1), and the outermost layer and the second outermost layer of the right side of the T-shaped stringer (1).

[0035] Specifically, the prepreg is pre-compacted once in a hot press tank every time the prepreg is laid for not more than 40 layers, the pre-compaction pressure is 0.4Mpa-0.7Mpa, and the pressure holding time is not less than 30min.

[0036] Step four, after the T-shaped stringer (1) is laid and the film is combined, a group of polytetrafluoroethylene sheets are embedded at the junction of the T-shaped stringer twist area (4) and the two side R areas, and then a twist strip is placed in the twist area. Step five, a vacuum bag is made for the T-shaped stringer (1), and the T-shaped stringer (1) is pressure cured in a hot press tank, and then the T-shaped stringer (1) is trimmed after being taken out of the tank.

[0037] Step six, the skin (2) prepreg is laid according to the design of the prepreg, and a group of polytetrafluoroethylene sheets are placed between the first layer and the second layer on the upper surface of the skin (2), the middle layer of the skin (2), and the outermost layer and the second outermost layer of the lower surface of the skin (2). Specifically, the laying process is pre-pressed once in a hot pressing tank for each laying of not more than 40 layers of the laying sheet, the pre-pressing pressure is 0.4 Mpa-0.7 Mpa, and the pressure maintaining time is not less than 30 min.

[0038] Step seven, pre-installing the T-shaped stringer (1), laying a layer of adhesive film between the T-shaped stringer (1) and the skin (2), and placing a set of polytetrafluoroethylene sheets on the upper and lower surfaces of the adhesive film (3). Step eight, after the pre-installation is completed, a vacuum bag is prepared, and the T-shaped stringer wall plate ultrasonic detection comparison device is obtained after the tank is taken out and trimmed. Example three A certain type of carbon fiber composite material reinforced plate ultrasonic detection comparison test block The reinforced plate ultrasonic comparison test block includes two secondary parts, a T-shaped stringer (1) and a skin (2), and is formed by gluing the T-shaped stringer (1) and the skin (2) through the adhesive film (3). The T-shaped stringer (1) and the skin (2) are both carbon fiber unidirectional tape laminated structures, the T-shaped stringer (1) has a thickness of 10 mm (80 layers of laying), and the skin (2) has a thickness of 6 mm (48 layers of laying).

[0039] As shown in Figures 1-5 The first layer between the left side of the T-shaped stringer and the second layer, the middle layer of the T-shaped stringer, and the outermost layer between the right side of the T-shaped stringer and the next outer layer are respectively pre-buried with a set of artificial defect polytetrafluoroethylene sheets (5), each set of which is 51, 52, and 53 in size. A set of artificial defect polytetrafluoroethylene sheets (5) are pre-buried at the interface between the T-shaped stringer twist area (4) and the two sides R area, each set of which is 54, 55, and 56 in size. The first layer between the upper surface of the skin (2) and the second layer, the middle layer of the skin (2), and the outermost layer between the lower surface of the skin (2) and the next outer layer are respectively pre-buried with a set of artificial defect polytetrafluoroethylene sheets (5), each set of which is 51, 52, and 53 in size. A set of artificial defect polytetrafluoroethylene sheets (5) are pre-buried on the upper and lower surfaces of the adhesive film at the gluing surface between the T-shaped stringer (1) and the skin (2), each set of which is 51, 52, and 53 in size.

[0040] The ultrasonic detection comparison test block preparation method provided by the present application will be further described below in combination with the drawings, so that the present application can be better understood. The implementation steps are as follows: Step one, spread the T-shaped stringer (1) and the skin (2) in the composite material reinforced plate ultrasonic detection comparison test block into a planar graph according to the part shape and size.

[0041] Step two, cut the composite material prepreg according to the planar graph obtained in step one to obtain the laying sheet of the T-shaped stringer (1) and the skin (2), and the number of layers and the angle of the laying sheet are the same as the design structure of the part. Step three, lay T-shaped stringer (1). The T-shaped stringer (1) cut in step two is laid according to the designed layer angle and number, and a group of polytetrafluoroethylene sheets (5) are placed between the first layer and the second layer on the left side of the T-shaped stringer, between the middle layer (between the 40th layer and the 41st layer) of the T-shaped stringer, and between the outermost layer and the next outer layer on the right side of the T-shaped stringer, each group being 51, 52, and 53 in size, with specific sizes of 51 being Φ3mm, 52 being Φ6mm, and 53 being Φ9mm. During the laying process, the laid material is pre-compacted once in the autoclave for every 40 layers or less, with a pre-compaction pressure of 0.4Mpa-0.7Mpa and a pressure holding time of no less than 30min.

[0042] Step four, after the T-shaped stringer 1 is laid and the film is combined, a group of polytetrafluoroethylene sheets (5) are placed in the twist area (4) of the T-shaped stringer and on both sides of the R area, each group being 54, 55, and 56 in size, with specific sizes of 54 being 3mm×3mm, 55 being 6mm×6mm, and 56 being 9mm×9mm, and a twist is then placed.

[0043] Step five, a vacuum bag is made for the T-shaped stringer (1), which is then pressurized and cured in the autoclave, and after being taken out of the autoclave, the T-shaped stringer 1 is demolded and trimmed. Step six, lay the skin (2) of the comparison test block. The skin (2) cut in step two is laid according to the designed layer angle and number, and a group of polytetrafluoroethylene sheets (5) are placed between the first layer and the second layer on the upper surface of the skin (2), between the middle layer (between the 24th layer and the 25th layer) of the skin (2), and between the outermost layer and the next outer layer on the lower surface of the skin (2), each group being 51, 52, and 53 in size, with specific sizes of 51 being Φ3mm, 52 being Φ6mm, and 53 being Φ9mm. During the laying process, the laid material is pre-compacted once in the autoclave for every 40 layers or less, with a pre-compaction pressure of 0.4Mpa-0.7Mpa and a pressure holding time of no less than 30min. Step seven, pre-assemble the T-shaped stringer (1), and lay a layer of adhesive film (3) between the T-shaped stringer (1) and the skin (2), with a group of polytetrafluoroethylene sheets (5) placed on the upper and lower surfaces of the adhesive film (3), each group being 51, 52, and 53 in size, with specific sizes of 51 being Φ3mm, 52 being Φ6mm, and 53 being Φ9mm.

[0044] Step eight, after the pre-assembly is completed, a vacuum bag is made, which is then pressurized and cured in the autoclave, and after being taken out of the autoclave, the part is trimmed to obtain an ultrasonic detection comparison test block.

[0045] It should be noted that the above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the principles of the present application shall be included in the protection scope of the present application.

Claims

1. A T-shaped reinforced wall panel ultrasonic detection and comparison device, characterized in that: It comprises a T-shaped long stringer (1), a skin (2), a film (3), a T-shaped long stringer twisting area (4), and a polytetrafluoroethylene sheet (5), wherein: The T-shaped long stringer (1) is a T-shaped structure, and the bottom edge of the T-shaped long stringer (1) is bonded to the skin (2) by means of a film (3); Artificial defects are pre-embedded at the bonding surface between the T-shaped long stringer (1) and the skin (2), the interface between the T-shaped long stringer twisting zone (4) and the R zone, and the bonding surface between the T-shaped long stringer reinforcement and the skin (2); the R zone interface is the arc transition area where the T-shaped long stringer twisting zone (4) and the T-shaped long stringer reinforcement are connected; the T-shaped long stringer twisting zone (4) is the corner transition area where the bottom edge of the long stringer is connected to the T-shaped long stringer reinforcement; A set of artificial defects is embedded between the first and second layers on the left side of the T-shaped long truss reinforcement, a set of artificial defects is embedded in the middle layer of the T-shaped long truss reinforcement, and a set of artificial defects is embedded between the outermost layer and the second outermost layer on the right side of the T-shaped long truss reinforcement; A set of artificial defects are embedded in the interface between the twisting area (4) of the T-shaped long stringer and the R areas on both sides; A group of artificial defects are embedded between the upper surface and the second layer of the skin (2), a group of artificial defects are embedded in the middle layer of the skin (2), and a group of artificial defects are embedded between the outermost layer and the second outermost layer of the lower surface of the skin (2); A group of artificial defects are embedded in the upper surface of the adhesive film at the adhesive joint surface between the T-shaped long stringer (1) and the skin (2), and a group of artificial defects are embedded in the lower surface of the adhesive film.

2. The ultrasonic detection and comparison device for T-shaped reinforced wall panels according to claim 1, characterized in that: The T-shaped long stringer (1) and the skin (2) are bonded together by means of a film (3); the T-shaped long stringer (1) and the skin (2) are both composite material laminated structures.

3. The ultrasonic detection and comparison device for T-shaped reinforced wall panels according to claim 1, characterized in that: The artificial defect material is a polytetrafluoroethylene sheet, including a first polytetrafluoroethylene sheet 51, a second polytetrafluoroethylene sheet 52, a third polytetrafluoroethylene sheet 53, a fourth polytetrafluoroethylene sheet 54, a fifth polytetrafluoroethylene sheet 55, and a sixth polytetrafluoroethylene sheet 56.

4. The ultrasonic detection and comparison device for T-shaped reinforced wall panels according to claim 3, characterized in that: Each group of artificial defect polytetrafluoroethylene sheets shall consist of at least three groups of sizes and shall be staggered and non-overlapping when placed.

5. The ultrasonic detection and comparison device for T-shaped reinforced wall panels according to claim 3, characterized in that: The first polytetrafluoroethylene sheet 51 , the second polytetrafluoroethylene sheet 52 and the third polytetrafluoroethylene sheet 53 are circular in shape, and their sizes increase in sequence.

6. The ultrasonic detection and comparison device for T-shaped reinforced wall panels according to claim 3, characterized in that: The fourth polytetrafluoroethylene sheet 54 , the fifth polytetrafluoroethylene sheet 55 and the sixth polytetrafluoroethylene sheet 56 are rectangular in shape, and their sizes increase in sequence.

7. The ultrasonic detection and comparison device for T-shaped reinforced wall panels according to claim 1, characterized in that: During the laying process of the T-shaped long stringer (1) and the skin (2), the laying material sheets are pre-compacted once in the autoclave every time no more than 40 layers are laid.

8. The ultrasonic detection and comparison device for T-shaped reinforced wall panels according to claim 1, characterized in that: The pre-compaction pressure is 0.4Mpa~0.7Mpa, and the pressure holding time is not less than 30min.

9. A method for preparing an ultrasonic detection and comparison device for a T-shaped reinforced wall panel, characterized in that: The method is applied to the ultrasonic detection and comparison device for T-shaped reinforced wall panels according to claim 1, comprising: Step one, the T-shaped reinforced wall panel ultrasonic detection comparison device T-shaped long stringer (1), skin (2) according to the shape and size of the parts expanded into a plane graphic; Step 2: cutting the composite material prepregs according to the plane pattern shown to obtain T-shaped stringer (1) ply sheets and skin (2) ply sheets; Step three, the T-shaped long stringer (1) is laid in layers according to the design, and a group of polytetrafluoroethylene sheets are placed between the first and second layers of the vertical reinforcement of the T-shaped long stringer (1), the middle layer of the T-shaped long stringer (1), and the outermost layer and the second outer layer on the right side of the vertical reinforcement of the T-shaped long stringer (1); Step four, after the T-shaped long stringer (1) is laid and the membrane is completed, a set of polytetrafluoroethylene sheets are pre-embedded in the interface between the T-shaped long stringer twisting zone (4) and the R zone on both sides, and then the twist strips are placed in the twisting zone; Step five, the T-shaped long stringer (1) system vacuum bag, pressurized and cured in an autoclave, after the tank T-shaped long stringer (1) is trimmed; Step six, laying the skin (2) layer sheet according to the designed layering, and placing a group of polytetrafluoroethylene sheets between the first layer and the second layer of the upper surface of the skin (2), the middle layer of the skin (2), and the outermost layer and the second outermost layer of the lower surface of the skin (2); Step seven, pre-installed T-shaped long stringer (1), in the T-shaped long stringer (1) and the skin (2) between the laying of a layer of film, the film (3) on the upper and lower surfaces are placed a group of polytetrafluoroethylene sheet; Step eight, after the pre-assembly is completed, a vacuum bag is made, pressurized and cured in an autoclave, and trimmed after being taken out of the autoclave to obtain a T-shaped reinforced wall panel ultrasonic detection comparison device.

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