A clamp and mounting method for high-temperature vibration test of composite material plate

Abstract

The application discloses a kind of high temperature vibration test fixture for composite material plate, including vibration table fixed base, ceramic column base, ceramic clamp cover plate, bolt, environmental chamber, clamp water cooling device and air-tight device, the high temperature part where the fixture is ceramic component, more resistant to high temperature, can provide higher temperature test environment for vibration test, the present application is directly improved and installed ceramic component in vibration table fixed base, saves cost;The application designs multiple centering, positioning device, to ensure that test piece can be quickly centered, positioned during installation process, ensure the accurate transmission of vibration excitation during test process;The overall structure of the application is simple, low in cost, and has strong compatibility for the shape, thickness of composite material plate and experimental equipment, and the application is simple to assemble, can easily realize centering, positioning, can meet the vibration test under different temperature environments, and ensure the accuracy of test.

Description

TECHNICAL FIELD

[0001] The present application relates to high-temperature vibration test of various atmosphere environments, and belongs to the technical field of reliability evaluation of aviation composite materials, in particular to a clamp for high-temperature vibration test of composite material plates. BACKGROUND

[0002] With the continuous progress and development of aero-engine science and technology, the hot end components of the aero-engine are also required to move forward in the direction of higher thrust, higher pressure ratio and higher reliability. The materials for preparing aero-engine components need to withstand higher temperatures and have good structural properties. Currently, the materials used in aero-engines are mainly high-temperature alloys, and the highest working temperature can only reach about 1100℃. However, with the progress of aviation technology, the turbine inlet temperature of the engine needs to continue to increase, and will be as high as about 2000℃.

[0003] New composite materials mainly composed of ceramic matrix composites have higher modulus and higher strength, and can better resist ablation and thermal shock, and are currently the better choice for making hot end components of aero-engines. In order to evaluate the safety and reliability of composite materials in the field of aerospace application, it is necessary to conduct complex and variable vibration test tests under high temperature and various atmosphere environments such as oxygen and non-oxygen.

[0004] Currently, the clamps used in various high-temperature vibration tables are all alloys, and the highest working temperature can only reach about 1100℃. Such clamps cannot provide higher temperature environments for vibration tests, and are prone to oxidation, fatigue and creep damage under long-term high-temperature environments, resulting in inaccurate vibration test results.

[0005] Therefore, it is necessary to design a clamp for high-temperature vibration test of composite material plates under various atmosphere environments. SUMMARY

[0006] The purpose of the present application is to provide a clamp for high-temperature vibration test of composite material plates under various atmosphere environments, to solve the problems of the prior art in the background art, and to enable high-temperature vibration test above 1300℃.

[0007] To achieve the above purpose, the present application adopts the following technical solutions:

[0008] The utility model provides a kind of fixture for high temperature vibration test of composite material board, including vibration table fixed base, vibration table fixed base is located at the bottom of environmental box, vibration table fixed base lower end penetrates the bottom of environmental box and is placed outside environmental box, vibration table fixed base lower end is sleeved with airtight rubber ring, airtight rubber ring upper end is fixed on the sealing disc outside environmental box by sealing ring, airtight rubber ring lower end is fixed on the bottom end of vibration table fixed base disc-shaped bottom by sealing ring, vibration table fixed base upper end surface is provided with positioning slot, positioning slot is matched with the positioning boss of ceramic columnar base lower end, ceramic columnar base upper end is provided with test piece positioning slot, test piece is placed in test piece positioning slot, and it is fixed on the upper end of ceramic columnar base by ceramic clamp cover plate.

[0009] Further, the positioning boss on the lower end of the ceramic columnar base is also provided with a raised positioning column, and the upper end of the vibration table fixing base is provided with a vibration table positioning hole matching the positioning column.

[0010] Further, the ceramic clamp cover plate and the test piece are fixed on the ceramic columnar base by long bolts, the ceramic columnar base is internally provided with a step-shaped through hole penetrating up and down, the step-shaped through hole includes a step-shaped through hole stud segment and a step-shaped through hole threaded segment, the diameter of the step-shaped through hole stud segment is slightly larger than the diameter of the stud segment of the long bolt, the step-shaped through hole threaded segment is threadedly matched with the threaded segment of the long bolt, the upper end of the vibration table fixing base is provided with a vibration table fixing base threaded hole identical to the step-shaped through hole threaded segment, the long bolt is screwed into the step-shaped through hole threaded segment through the step-shaped through hole stud segment and then into the vibration table fixing base threaded hole, the length of the threaded segment of the long bolt is identical to the length of the step-shaped through hole threaded segment and the vibration table fixing base threaded hole added together, the depth of the threaded segment of the long bolt screwed into the vibration table fixing base threaded hole is adjusted according to the thickness of the test piece, the ceramic clamp cover plate is provided with a ceramic clamp cover plate positioning hole, the ceramic clamp cover plate positioning hole is identical to the step-shaped through hole, and the part of the test piece fixed in the test piece positioning slot is provided with a test piece positioning hole identical to the ceramic clamp cover plate positioning hole.

[0011] Further, the number of long bolts, step-shaped through holes, vibration table fixing base threaded holes, ceramic clamp cover plate positioning holes and test piece positioning holes is identical and at least 2.

[0012] Further, the bottom end of the vibration table fixing base disc-shaped bottom is provided with radially penetrating water cooling holes, which cooperate with external water circulation cooling machines to cool the vibration table fixing base and long bolts during experiments.

[0013] Further, the number of water cooling holes is at least 2.

[0014] Further, the sealing disc is fixed integrally with the environment box outside, the upper end of the sealing ring clamping the airtight rubber ring is fixed with the sealing disc through the sealing ring connecting bolt, the lower end of the sealing ring clamping the airtight rubber ring is fixed on the bottom end of the vibration table fixed base disc through the sealing ring connecting bolt, the upper and lower ends of the sealing ring, the sealing disc and the airtight rubber ring are provided with upper and lower through sealing ring connecting bolt holes corresponding to the sealing ring connecting bolt, and the lower end of the vibration table fixed base is not in direct contact with the environment box wall, the airtight rubber ring and the sealing disc.

[0015] Further, the ceramic columnar base and the ceramic clamp cover plate are both made of zirconia ceramic material.

[0016] The application also provides a mounting method of the clamp for high-temperature vibration test of composite material plates.

[0017] S1: connect the external water circulation cooler to the water cooling hole, and sequentially put the airtight rubber ring and the sealing ring into the lower end of the vibration table fixed base, use the sealing ring connecting bolt to pass through the sealing ring connecting bolt holes of the sealing ring, the lower end of the airtight rubber ring and the bottom end of the vibration table fixed base disc, and tightly screw the sealing ring;

[0018] S2, put the environment box into the vibration table fixed base, use the sealing ring connecting bolt to pass through the sealing ring connecting bolt holes of the sealing ring, the upper end of the airtight rubber ring and the sealing disc, and tightly screw the sealing ring, so that the vibration table fixed base and the environment box are connected as a whole;

[0019] S3, install the ceramic columnar base on the vibration table fixed base, so that the positioning boss is matched and positioned with the positioning groove, and the positioning column is matched and positioned with the vibration table positioning hole;

[0020] S4, fix one end of the test piece provided with a test piece positioning hole in the test piece positioning groove, cover the ceramic clamp cover plate, use the long bolt to pass through the ceramic clamp cover plate positioning hole and the test piece positioning hole and then put into the stepped through hole, and then screw the threaded section of the stepped through hole and the threaded hole of the vibration table fixed base, so that the test piece is fixed on the ceramic columnar base;

[0021] S5, check the connection and fastening of the test piece, the ceramic columnar base and the vibration table fixed base, ensure that each component does not shake in any direction, cover the lid of the environment box and tighten it with a bolt;

[0022] S6, turn on the power of the external water circulation cooler, check whether the water cooling connection leaks, then turn on the air pump and observe the air pressure gauge to detect the air tightness, turn on the high-temperature furnace, wait until the environment in the environment box reaches the predetermined environment, and then turn on the vibration table to start the test.

[0023] The application provides a high-temperature vibration experiment device with atmosphere and an experiment method.

[0024] 1、The high-temperature part of the clamp is a ceramic part, which is more resistant to high temperature, can provide a higher temperature test environment for the vibration test, and the alloy part of the test piece clamp and the vibration table are provided with a water cooling device, and the actual test verifies that, in the case that the temperature of the high-temperature equipment is heated to 1200 DEG C and constant, the temperature of the environmental box and the vibration table fixed base is only 45 DEG C under the action of the design, the sealing ring, the water pump power of 0.09 kW, the maximum flow of 15 L / min and the compressor power of 0.85 kW water cooler, the highest circulating water temperature of the water cooler is 42 DEG C, which will not damage the vibration table equipment, at the same time, reduces the damage of the test clamp caused by oxidation and thermal fatigue, saves the cost, prolongs the service life of the machine, improves the test accuracy;

[0025] 2、The application is improved and ceramic parts are added to the vibration table fixed base, thereby saving the cost;

[0026] 3、The application designs multiple positioning devices to ensure that the test piece can be quickly centered and positioned during installation, and the external box and the air-tight device are not directly in contact with the vibration table, thereby avoiding interference with the vibration table and ensuring accurate transmission of vibration excitation during the test;

[0027] 4、The application has simple overall structure and low cost, is strong in compatibility with the shape and thickness of the composite material plate and the experimental equipment, is simple to assemble, can easily realize centering and positioning, can meet the vibration test under different temperature environments, and ensures the accuracy of the test. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is the overall and schematic diagram of the application (the environmental box is a sectional view);

[0029] Figure 2 It is the schematic diagram of the vibration table fixed base of the application;

[0030] Figure 3 It is the schematic diagram of the sealing disc and the sealing ring structure of the application;

[0031] Figure 4 It is the overall schematic diagram of the air-tight device of the application;

[0032] Figure 5 It is the schematic diagram of the ceramic columnar base of the application;

[0033] Figure 6 It is the matching sectional view of the ceramic columnar base and the vibration table fixed base of the application;

[0034] Figure 7 This is a schematic diagram of the test specimen for the present invention;

[0035] Figure 8 This is a schematic diagram of the ceramic clamp cover plate of the present invention;

[0036] Figure 9 This is a schematic diagram of the long bolt of the present invention;

[0037] Figure 10 This is a schematic diagram of the environmental chamber of the present invention;

[0038] Figure 11 This is a schematic diagram of the airtight rubber ring of the present invention;

[0039] Figure 12 This is a complete installation diagram of the present invention;

[0040] The components include: vibration table fixed base-1, environmental chamber-2, airtight rubber ring-3, sealing ring-4, sealing disc-5, positioning groove-6, ceramic column base-7, positioning boss-8, test piece positioning groove-9, test piece-10, ceramic fixture cover plate-11, positioning post-12, vibration table positioning hole-13, long bolt-14, stepped through hole-15, stepped through hole stud section-15a, stepped through hole threaded section-15b, stud section-16, threaded section-17, vibration table fixed base threaded hole-18, ceramic fixture cover plate positioning hole-19, test piece positioning hole-20, water cooling hole-21, sealing ring connecting bolt-22, and sealing ring connecting screw hole-23. Detailed Implementation

[0041] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0042] like Figure 1 The diagram shown is a cross-sectional view of the environmental chamber, illustrating the overall design of this invention. A fixture for high-temperature vibration testing of composite material sheets includes a vibration table fixing base 1 located at the bottom of the environmental chamber 2. The lower end of the vibration table fixing base 1 penetrates the bottom of the environmental chamber 2 and is positioned outside the environmental chamber 2. An airtight rubber ring 3 is fitted onto the lower end of the vibration table fixing base 1. The upper end of the airtight rubber ring 3 is fixed to a sealing disc 5 outside the environmental chamber 2 via a sealing ring 4. The lower end of the airtight rubber ring 3 is fixed to the disc-shaped bottom end of the vibration table fixing base 1 via the sealing ring 4. The vibration table fixing base 1 has no direct contact with the environmental chamber 2 and the sealing disc 5. A positioning groove 6 is formed on the upper surface of the vibration table fixing base 1. The positioning groove 6 matches a positioning boss 8 at the lower end of a ceramic columnar base 7. A test piece positioning groove 9 is formed on the upper end of the ceramic columnar base 7. The test piece 10 is placed in the test piece positioning groove 9 and fixed to the upper end of the ceramic columnar base 7 by a ceramic fixture cover plate 11.

[0043] like Figure 2As shown, the upper surface of the vibration table fixed base 1 has a positioning groove 6 and Figure 5 As shown, the positioning boss 8 at the lower end of the ceramic columnar base 7 cooperates to realize positioning, and the middle has a vibration table positioning hole 13 and Figure 6 As shown, the positioning column 12 of the ceramic columnar base 7 cooperates to realize centering. The disc-shaped bottom end of the vibration table fixed base 1 with water cooling holes 21 is connected to the lower end of the air-tight rubber ring 3 through the sealing ring connecting bolt 22, and the two water cooling holes 21 realize cooling of the vibration table fixed base 1 and the long bolt 14 through the water circulation cooling machine outside.

[0044] As shown, Figure 3 As shown, the sealing ring 4 and the sealing disc 5 are connected through the upper and lower through sealing ring connecting bolt holes 23 opened on the surface.

[0045] As shown, Figure 4 As shown, the sealing disc 5 is a sealing part integrated with the environmental box 2, and the upper end of the air-tight rubber ring 3 is clamped by the sealing ring 4, so as to realize the gas sealing protection of the clamp as a whole. Among them, the inner diameter size of the sealing ring 4, the sealing disc 5 and the air-tight rubber ring 3 is greater than the outer diameter size of the vibration table fixed base 1, so as to ensure that the vibration table is not disturbed during the test process.

[0046] As shown, Figure 5 As shown, the upper surface of the ceramic columnar base 7 has a test piece positioning groove 9 for cooperating with the test piece 10 to realize rapid installation, and the ceramic columnar base 7 is provided with an upper and lower through stepped through hole 15 for inserting the long bolt 14 for assembly.

[0047] As shown, Figure 6 As shown, the stepped through hole screw column section 15a of the ceramic columnar base 7 and the screw column section 16 of the long bolt 14 have the same length but slightly larger radius, so as to ensure that the centering and positioning are avoided while the long bolt 14 is expanded in the high temperature environment. The length of the threaded section 17 of the long bolt 14 is the sum of the length of the stepped through hole threaded section 15b of the ceramic columnar base 7 and the length of the vibration table fixed base threaded hole 18, so as to adapt to test pieces of different thicknesses.

[0048] As shown, Figure 7 , Figure 8 As shown, four through holes are opened on the test piece 10 as test piece positioning holes 20, and four through holes are opened on the ceramic clamp cover plate 11 as ceramic clamp cover plate positioning holes 19, and the shape and size of the through holes are the same as the cross section of the screw column section 16 of the long bolt 14. All the positioning parts and through holes of the clamp are for centering and positioning, so as to accurately conduct the vibration excitation force of the vibration table and strengthen the accuracy of the test.

[0049] As Figure 9 The figure shows the schematic diagram of the long bolt 14 of the present application, the upper half is the stud section 16, and the lower half is the threaded section 17.

[0050] As Figure 10 The figure shows that the environmental box 2 has a box cover connected with the box body through bolts, and the internal space of the environmental box is the placement of the clamp and test piece of the present application, and provides high temperature and various atmosphere environments.

[0051] The installation process of the present application for high temperature vibration test under various atmosphere environments is as follows:

[0052] 1) Connect the external water circulating cooler to the water cooling hole 21, and sequentially put the air-tight rubber ring 3 and the sealing ring 4 into the lower end of the vibration table fixed base 1, and tighten them with the sealing ring connecting bolts 22;

[0053] 2) Put the environmental box 2 into the vibration table fixed base 1, and connect the sealing ring 4 and the sealing disc 5 with the sealing ring connecting bolts 22;

[0054] 3) Sequentially install the ceramic columnar base 7 on the vibration table fixed base 1;

[0055] 4) Place the test piece 10 and the ceramic clamp cover plate 11 on the ceramic columnar base 7 by using the test piece positioning groove 9, the ceramic clamp cover plate positioning hole 19, and the test piece positioning hole 20;

[0056] 5) Put the long bolt 14 through the ceramic clamp cover plate positioning hole 19, the test piece positioning hole 20, and the stepped through hole 15 in sequence, ensure that the long bolt 14 is tightened with the stepped through hole threaded section 15b and the vibration table fixed base threaded hole 18, and ensure that the components do not shake in any direction, cover the box cover of the environmental box 2 and tighten it with bolts;

[0057] 6) Turn on the power of the external water circulating cooler, check if the water cooling connection is leaking, turn on the air pump and observe the air pressure gauge, detect the air tightness, turn on the high temperature furnace, and start the test when the predetermined environment is reached.

[0058] The above is only the preferred embodiment of the present application, and the protection scope of the present application is not limited to the above-mentioned embodiments, and any technical solution belonging to the idea of the present application is within the protection scope of the present application. It should be noted that for ordinary technical personnel in the technical field, some improvements and decorations without departing from the principle of the present application should be considered as the protection scope of the present application.

Claims

1. A fixture for high temperature vibration test of composite material panels, comprising a vibration table fixed base (1), characterized in that, The vibration table fixed base (1) is located at the bottom of the environmental box (2), the lower end of the vibration table fixed base (1) penetrates the bottom of the environmental box (2) and is placed outside the environmental box (2), the lower end of the vibration table fixed base (1) is sleeved with an airtight rubber ring (3), the upper end of the airtight rubber ring (3) is fixed on the sealing disc (5) outside the environmental box (2) through the sealing ring (4), the lower end of the airtight rubber ring (3) is fixed on the disc-shaped bottom end of the vibration table fixed base (1) through the sealing ring (4), the upper end surface of the vibration table fixed base (1) is provided with a positioning groove (6), the positioning groove (6) is matched with the positioning boss (8) at the lower end of the ceramic columnar base (7), the upper end of the ceramic columnar base (7) is provided with a test piece positioning groove (9), the test piece (10) is placed in the test piece positioning groove (9) and is fixed on the upper end of the ceramic columnar base (7) through the ceramic clamp cover plate (11); The ceramic clamp cover plate (11) and the test piece (10) are fixed on the ceramic columnar base (7) through the long bolt (14), the ceramic columnar base (7) is internally provided with a step-shaped through hole (15) penetrating up and down, the step-shaped through hole (15) comprises a step-shaped through hole threaded section (15b) and a step-shaped through hole threaded section (15b), the diameter of the step-shaped through hole threaded section (15a) is slightly larger than the diameter of the threaded section (16) of the long bolt (14), the step-shaped through hole threaded section (15b) is threadedly matched with the threaded section (17) of the long bolt (14), the upper end of the vibration table fixed base (1) is provided with a vibration table fixed base threaded hole (18) which is the same as the step-shaped through hole threaded section (15b), the long bolt (14) is screwed into the step-shaped through hole threaded section (15b) and then screwed into the vibration table fixed base threaded hole (18) through the step-shaped through hole threaded section (15a), the length of the threaded section (17) of the long bolt (14) is the same as the length of the step-shaped through hole threaded section (15b) and the vibration table fixed base threaded hole (18) added together, the depth of the threaded section (17) of the long bolt (14) screwed into the vibration table fixed base threaded hole (18) is adjusted according to the thickness of the test piece (10), the ceramic clamp cover plate (11) is provided with a ceramic clamp cover plate positioning hole (19), the ceramic clamp cover plate positioning hole (19) is the same as the step-shaped through hole (15), the part of the test piece (10) fixed in the test piece positioning groove (9) is provided with a test piece positioning hole (20), the test piece positioning hole (20) is the same as the ceramic clamp cover plate positioning hole (19); The disc-shaped bottom end of the vibration table fixed base (1) is provided with a radial water cooling hole (21), the water cooling hole (21) is matched with an external water circulation cooling machine to cool the vibration table fixed base (1) and the long bolt (14) during the experiment.

2. The fixture for high temperature vibration testing of composite panels according to claim 1, wherein The positioning boss (12) is arranged on the positioning boss (8) of the lower end of the ceramic columnar base (7), and the upper end of the vibration table fixing base (1) is provided with a vibration table positioning hole (13) matched with the positioning boss (12).

3. The fixture for high temperature vibration testing of composite panels according to claim 1, wherein, The number of the long bolts (14), the stepped through holes (15), the vibration table fixing base threaded holes (18), the ceramic clamp cover plate positioning holes (19) and the test piece positioning holes (20) is same and at least two.

4. The fixture for high temperature vibration testing of composite panels according to claim 1, wherein, The number of the water cooling holes (21) is at least two.

5. The fixture for high temperature vibration testing of composite panels according to claim 1, wherein, The sealing disc (5) is fixed to the environment box (2) as a whole, the upper end of the sealing ring (4) clamping the air-tight rubber ring (3) is fixed to the sealing disc (5) through the sealing ring connecting bolt (22), the lower end of the sealing ring (4) clamping the air-tight rubber ring (3) is fixed to the disc-shaped bottom end of the vibration table fixing base (1) through the sealing ring connecting bolt (22), the upper and lower ends of the sealing ring (4), the sealing disc (5) and the air-tight rubber ring (3) and the disc-shaped bottom end of the vibration table fixing base (1) are respectively provided with upper and lower through sealing ring connecting bolt holes (23) corresponding to the sealing ring connecting bolt (22), and the lower end of the vibration table fixing base (1) is not in direct contact with the environment box (2) wall, the air-tight rubber ring (3) and the sealing disc (5).

6. The fixture for high temperature vibration testing of composite panels according to claim 1, wherein, The ceramic columnar base (7) and the ceramic clamp cover plate (11) are both made of zirconia ceramic material.

7. A method of installing a fixture for high temperature vibration testing of composite panels as claimed in any one of claims 1 to 6, characterised in that, The method comprises the following steps: S1: connecting the external water circulation cooler to the water cooling hole (21), and sequentially sleeving the air-tight rubber ring (3) and the sealing ring (4) to the lower end of the vibration table fixing base (1), and screwing the sealing ring connecting bolt (22) through the sealing ring connecting bolt holes (23) of the sealing ring (4), the lower end of the air-tight rubber ring (3) and the disc-shaped bottom end of the vibration table fixing base (1); S2: sleeving the environment box (2) to the vibration table fixing base (1), and screwing the sealing ring connecting bolt (22) through the sealing ring connecting bolt holes (23) of the sealing ring (4), the upper end of the air-tight rubber ring (3) and the sealing disc (5), and sealingly screwing the vibration table fixing base (1) and the environment box (2) as a whole; S3: installing the ceramic columnar base (7) on the vibration table fixing base (1), matching and positioning the positioning boss (8) and the positioning groove (6), and matching and positioning the positioning boss (12) and the vibration table positioning hole (13); S4: fixing one end of the test piece (10) provided with the test piece positioning hole (20) to the test piece positioning groove (9), covering the ceramic clamp cover plate (11), sequentially screwing the long bolt (14) through the ceramic clamp cover plate positioning hole (19) and the test piece positioning hole (20) into the stepped through hole (15), and sequentially screwing the threaded section (17) to the stepped through hole threaded section (15b) and the vibration table fixing base threaded hole (18), so that the test piece (10) is fixed to the ceramic columnar base (7). S5, check the connection fastening of the test piece (10), the ceramic column base (7) and the vibration table fixed base (1), ensure that each component does not produce shaking in any direction, cover the box cover of the environmental box (2) and tighten it with bolts; S6, turn on the power of the external water circulation cooling machine, check whether the water cooling connection leaks, then turn on the air pump and observe the air pressure gauge to detect the air tightness, turn on the high temperature furnace, wait until the environmental box (2) reaches the predetermined environment, and then turn on the vibration table to start the test.

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