High-speed water impact simulation test system and method

Abstract

The invention discloses a high-speed water impact simulation test system and method. The system comprises a test piece, a high-pressure water gun and a water impact test device, and the water impact test device comprises a water gun fixing frame, a lifting table and a pressing plate; the test piece is of a box-shaped structure without a cover, and the outer edge of a bottom plate of the test piece is bent upwards and then is connected with a side plate of the test piece; the high-pressure water gun is fixed on the water gun fixing frame and can change the impact angle of the high-pressure water gun; the test piece is arranged on the lifting platform, and the pressing plate is arranged above the test piece and can move up and down to fix the test piece.

Description

Technical Field

[0001] The invention belongs to the technical field of water impact simulation testing, and in particular relates to a high-speed water impact simulation testing system and method. Background Art

[0002] Water navigation equipment will be affected by the impact of water flow during entry and driving. The faster the speed, the greater the impact force. However, since water navigation equipment is made of different panels, the joints are mostly bonded and sealed with adhesives or bolts / rivets + sealants. When impacted by high-speed water, these joints will crack and leak due to excessive impact force, causing danger.

[0003] The prior art does not have a suitable device to evaluate the feasibility of a certain adhesive / sealant in sealing the seams of water navigation equipment at different speeds. Summary of the invention

[0004] Purpose of the Invention

[0005] In order to evaluate the feasibility of applying a certain adhesive / sealant to the sealing joints of water navigation equipment at different speeds, the present invention provides a high-speed water impact simulation test system and method.

[0006] Inventing technical solutions

[0007] A high-speed water impact simulation test system comprises a test piece, a high-pressure water gun, and a water impact test device, wherein the water impact test device comprises a water gun fixing frame, a lifting platform, and a pressing plate; the test piece is a box-shaped structure without a cover, and the outer edge of the bottom plate of the test piece is bent upward and connected to the side plate of the test piece; the high-pressure water gun is fixed on the water gun fixing frame and can change the impact angle of the high-pressure water gun; the test piece is set on the lifting platform, and the pressing plate is set above the test piece and can move up and down to fix the test piece.

[0008] Preferably, the outer edges of each side of the bottom plate are bent upward, and the bent portion is located on the outer side of the side plate of the test piece.

[0009] Preferably, the upward bending portion of the bottom plate and the side plate on the corresponding side are sealed with adhesive; or the upward bending portion of the bottom plate and the side plate on the corresponding side are sealed with adhesive and fixed by the connecting piece 5.

[0010] Preferably, the folding height of each side of the bottom plate is not less than 10% of the height of the test piece, and the minimum folding height is not less than 10 mm. If the bending part is punched, the folding height must not be less than 3 times the hole diameter in addition to meeting the above requirements.

[0011] Preferably, it also includes a circulating water tank for storing and collecting water sprayed by the high-pressure water gun. The circulating water tank is an open container, and the water gun fixing bracket is arranged at the opening of the circulating water tank.

[0012] Preferably, it also includes a cylinder arranged on the water gun fixing frame, and the pressure plate can move up and down driven by the cylinder.

[0013] Preferably, both ends of at least one horizontal rod on the water gun fixing bracket are arranged in a slide groove, and the slide groove has a horizontal section and a vertical section.

[0014] Preferably, both the horizontal section and the vertical section of the slideway are provided with scales.

[0015] A high-speed water impact simulation test method comprises the following steps: after preparing a test piece, placing a box-shaped connection structure test piece on a lifting platform, fixing a high-pressure water gun on a water gun fixing frame, with the outlet of the high-pressure water gun facing the connection part between the bottom plate and the side plate of the test piece, adjusting the angle of the high-pressure water gun to a desired test angle, and then adjusting the lifting platform so that the connection part between the bottom plate and the side plate of the test piece is in a straight line with the impact direction of the high-pressure water gun, pressing down a pressure plate to fix the test piece, turning on the high-pressure water gun, and performing a water impact test according to the water flow velocity and test time specified in the test.

[0016] Advantages of the present invention: the device and method have a simple structure, low cost, high safety and stability, can be used to evaluate the water impact resistance of adhesives / sealants, can be used for water impact tests at the adhesive / sealant joints of box-shaped connection structures, and can perform water impact tests on joints at different angles and different speeds, thereby evaluating the water impact resistance of the box-shaped connection structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the adhesive box-shaped connection structure.

[0018] Figure 2 Schematic diagram of a bolt / rivet + sealant box connection.

[0019] Figure 3 It is a schematic diagram of the overall structure of a high-speed water impact simulation test system of the present invention.

[0020] Figure 4 It is a structural schematic diagram of the chute.

[0021] In the figure: 1-side panel, 2-bottom panel 2, 3-adhesive, 4-sealant, 5-connector, 6-test piece, 7-high-pressure water gun, 8-water gun fixing bracket, 9-slide, 10-lifting platform, 11-pressing plate, 12-circulating water tank, 13-joining part. DETAILED DESCRIPTION

[0022] The present invention is achieved through the following technical solutions.

[0023] A high-speed water impact simulation test system includes a test piece 6 for simulating the seams of water navigation equipment, a high-pressure water gun 7 for providing high-speed water flow for water impact test, and a water impact test device. The water flow speed is controlled according to the outlet size and flow rate of the high-pressure water gun 7.

[0024] Test piece 6 is a box-shaped structure without a cover. The size of the box body is adjustable. The materials of the side panels and bottom panel of the box body are determined by actual conditions. The four sides of the bottom panel are bent upward by 90° to a certain height. The upward bending part of the bottom panel is parallel to the side panel and is located outside the corresponding side panel. The upward bending part of the bottom panel is bonded and sealed with an adhesive (such as Figure 1 ), the upwardly bent portion of the bottom plate and the side plate on the corresponding side can also be sealed with adhesive and fixed through a connecting piece 5 (such as Figure 2 ), the connecting member 5 can be bolts, rivets, etc. The folding height of each side of the bottom plate shall not be less than 10% of the height of the test piece 6, and the minimum folding height shall not be less than 10mm. If the bending part is perforated, the folding height must not be less than 3 times the hole diameter in addition to meeting the above requirements.

[0025] The water impact test device includes a water gun fixing frame 8, a chute 9, a lifting platform 10, a pressing plate 11 and a circulating water tank 12. The circulating water tank 12 is an open container, and the water gun fixing frame 8 is arranged at the opening of the top surface of the circulating water tank 12. The lifting platform 10 is arranged at the lower part of the water gun fixing frame 8. The test piece 6 is fixed on the lifting platform 10. A pressing plate 11 is arranged above the test piece 6. The pressing plate 11 can move up and down under the drive of the cylinder, and the test piece 6 is fixed by the up and down movement of the pressing plate 11. The cylinder is arranged on the water gun fixing frame 8.

[0026] The water gun fixing frame 8 is a frame structure formed by connecting a number of horizontal bars and vertical bars, and the high-pressure water gun 7 is fixed on the water gun fixing frame 8 by metal buckles and the like. In this embodiment, the horizontal bar on the upper part of the water gun fixing frame 8 away from the test piece can move in the chute 9 on the water gun fixing frame 8. The chute 9 is L-shaped, and the chute is composed of a horizontal section and a vertical section. The horizontal section and the vertical section are both marked with scales. By fixing the high-pressure water gun 7 on the horizontal bar that can move in the chute, and sliding the horizontal bar to a suitable position to change the angle of the high-pressure water gun 7, the impact angle of the high-pressure water gun can be freely rotated within 0° to 90°. After adjusting in place, the two ends of the horizontal bar are fastened by screws or metal buckles. In order to make the high-pressure water gun stable, the other parts of the high-pressure water gun 7 can be reinforced and fixed to the water gun fixing frame 8 after adjusting the angle of the high-pressure water gun 7. The angle of the high-pressure water gun 7 can also be changed by fixing the high-pressure water gun to different positions of the water gun fixing frame 8.

[0027] The lifting platform 10 fixes the test piece 6 and enables the test piece 6 to move horizontally and vertically.

[0028] The circulating water tank 12 is used to store and collect water sprayed by the high-pressure water gun 7 for recycling.

[0029] A high-speed water impact simulation test method, according to Figure 1 and Figure 2 Prepare a box-shaped connection structure test piece, and after curing it according to the curing process of relevant adhesives and sealants, place the box-shaped connection structure test piece 6 on the lifting platform, fix the high-pressure water gun 7 on the water gun fixing frame 8, with the water gun outlet facing the joint part 13 of the test piece 6, adjust the angle of the high-pressure water gun 7 to the required test angle, and then adjust the lifting platform 10 so that the joint part 13 of the test piece 6 and the impact direction of the high-pressure water gun 7 are in a straight line, press down the pressing plate 11 to fix the test piece, and after the circulating water tank 12 is filled with water, place the water inlet of the high-pressure water gun 7 in the circulating water tank 12, turn on the high-pressure water gun motor, and perform a water impact test according to the water flow rate and test time specified in the test.

[0030] Embodiment 1:

[0031] Box-shaped connection structure test piece type: Adhesive box-shaped connection structure test piece.

[0032] Side panel test substrate: aluminum alloy plate, size 200mm×196mm.

[0033] Bottom plate test substrate: aluminum alloy plate, size 200mm×200mm, folding height 20mm.

[0034] Adhesive: Epoxy adhesive MF1325G.

[0035] The thickness of the seam is 1mm.

[0036] Preparation of adhesive box-shaped connection structure test piece:

[0037] The area to be bonded was polished with 120-grit sandpaper and cleaned with anhydrous ethanol. Masking tape was used to protect the area to be bonded. Components A and B of MF1325G were weighed in proportion and mixed. The adhesive was then applied to the area to be bonded 3. Ten steel beads with a diameter of 1 mm were evenly sprinkled between the folded part of the side panel and the bottom panel for bonding and fixing. A 45° fillet was performed between the joint surface and the inside of the side panel to seal. After finishing, the masking tape was removed and the area was cured at (23±2)℃ and (50±5)% for 7 days.

[0038] Embodiment 2:

[0039] Box-shaped connection structure test piece type: Adhesive box-shaped connection structure test piece.

[0040] Side panel test substrate: carbon fiber board, size 200mm×196mm.

[0041] Bottom plate test substrate: aluminum alloy plate, size 200mm×200mm, folding height 20mm.

[0042] Adhesive: Epoxy adhesive MF1325G.

[0043] The thickness of the seam is 1mm.

[0044] Preparation of adhesive box-shaped connection structure test piece:

[0045] The area to be bonded was polished with 120-grit sandpaper and cleaned with anhydrous ethanol. Masking tape was used to protect the area to be bonded. Components A and B of MF1325G were weighed in proportion and mixed. The adhesive was then applied to the area to be bonded 3. Ten steel beads with a diameter of 1 mm were evenly sprinkled between the folded part of the side panel and the bottom panel for bonding and fixing. A 45° fillet was performed between the joint surface and the inside of the side panel to seal. After finishing, the masking tape was removed and the area was cured at (23±2)℃ and (50±5)% for 7 days.

[0046] Embodiment 3:

[0047] Box-shaped connection structure test piece type: screwed box-shaped connection structure test piece.

[0048] Side panel test substrate: aluminum alloy plate, size 200mm×196mm.

[0049] Bottom plate test substrate: aluminum alloy plate, size 200mm×200mm, folding height 20mm.

[0050] Sealant: MF8402T.

[0051] The bolts are HB1-103 M5 (tolerance grade f9), the washers are GB 848 5, and the nuts are GB 1337M5.

[0052] The thickness of the seam is 1mm.

[0053] Preparation of adhesive box-shaped connection structure test piece:

[0054] Punch two pre-set holes evenly at the bonding parts of the bottom plate and each side plate, then polish the bonding parts with 120-grit sandpaper and clean them with anhydrous ethanol, use masking tape to protect the area to be bonded, weigh the A and B components of MF8402T in proportion, mix them, and apply glue to the bonding area 4, and evenly sprinkle 10 steel beads with a diameter of 1mm in the middle of the folded part of the side plate and the bottom plate, fix them with bolts 5, and seal the joint surface with a 45° fillet inside the side plate. After finishing, remove the masking tape and cure at (23±2)℃, (50±5)% for 7d.

[0055] Embodiment 4:

[0056] Box-shaped connection structure test piece type: screwed box-shaped connection structure test piece.

[0057] Side panel test substrate: carbon fiber board, size 200mm×196mm.

[0058] Bottom plate test substrate: aluminum alloy plate, size 200mm×200mm, folding height 20mm.

[0059] Sealant: MF8402T.

[0060] The bolts are HB1-103 M5 (tolerance grade f9), the washers are GB 848 5, and the nuts are GB 1337M5.

[0061] The thickness of the seam is 1mm.

[0062] Preparation of adhesive box-shaped connection structure test piece:

[0063] Punch two pre-set holes evenly at the bonding parts of the bottom plate and each side plate, then polish the bonding parts with 120-grit sandpaper and clean them with anhydrous ethanol, use masking tape to protect the area to be bonded, weigh the A and B components of MF8402T in proportion, mix them, and apply glue to the bonding area 4, and evenly sprinkle 10 steel beads with a diameter of 1mm in the middle of the folded part of the side plate and the bottom plate, fix them with bolts 5, and seal the joint surface with a 45° fillet inside the side plate. After finishing, remove the masking tape and cure at (23±2)℃, (50±5)% for 7d.

[0064] Test example:

[0065] Combined with the actual use requirements, salt spray test and water impact test were carried out on Examples 1 to 4 after curing. The salt spray test is used to evaluate the tolerance of materials under salt spray corrosion, and the test is carried out in accordance with GJB150.11-2009 "Military Equipment Laboratory Environmental Test Method Part 11: Salt Spray Test", with the test points being 240h, 480h, 720h, and 960h, and a 10-minute watertight test and a water impact test are required after each test.

[0066] The water impact test is used to evaluate the water impact resistance of the material, and is performed using the test method of the present invention, with the test point being after each salt spray test.

[0067] Test conditions: The high-pressure water gun outlet is at an angle of 30° to the side plate of the box-shaped connection structure, the water gun outlet flow rate is 45m / s, and each test time is 7.5min

[0068] The specific implementation is as follows:

[0069] According to the outlet water flow velocity of 45m / s and the nozzle area of ​​the water gun of 6.325mm 2 Determine the flow rate of the high-pressure water gun. After calculation, the flow rate is 1.025m 3 / h.

[0070] according to Figure 1 or Figure 2 Prepare the box-shaped connection structure test piece, and after curing it according to the curing process of the relevant adhesives and sealants, place the box-shaped connection structure test piece 6 on the lifting platform, fix the high-pressure water gun 7 on the water gun fixing frame 8, with the water gun outlet facing the joint part 13 of the test piece 6, rotate the rotating shaft 9 to make the water gun outlet form a 30° angle with the side plate of the box-shaped connection structure, and then adjust the lifting platform 10 to make the joint part 13 of the test piece 6A surface and the impact direction of the water gun in a straight line, press down the pressing plate 11 to fix the test piece, and after the circulating water tank is filled with water, place the water inlet of the high-pressure water gun in the circulating water tank, turn on the water gun and start the water pump, and adjust the flow rate to 1.025m 3 / h, start timing, turn off the water pump after 7.5min of water shock, and remove the test piece. Replace test surfaces B, C, and D, and repeat the above steps. After all four test surfaces of the test piece are tested, conduct a visual inspection of the test piece to check whether the adhesive layer of the test piece is debonded, and record the appearance of the test piece. Fill the test piece with water and let it stand for 10min to observe whether it is watertight or leaking.

[0071] The specific test results are shown in Table 1.

[0072] Table 1 Test results of test pieces

[0073]

[0074]

[0075] The data of the above examples show that:

[0076] Both Example 1 and Example 2 are adhesive box-shaped connection structure test pieces, but Example 1 uses an all-aluminum alloy test piece, and Example 2 uses a carbon fiber-aluminum alloy test piece. After aging in the salt spray test, the water impact resistance of Example 2 is better than that of Example 1; Example 3 and Example 4 are screwed box-shaped connection structure test pieces, but Example 1 uses an all-aluminum alloy test piece, and Example 2 uses a carbon fiber-aluminum alloy test piece. After aging in the salt spray test, the water impact resistance of Example 3 is better than that of Example 4. As the salt spray aging time of Examples 1, 2 and 4 increases, the number of water impacts increases, and the damage to the adhesive layer of the test pieces increases. Finally, Examples 1 and 2 leak and cause the test pieces to fail. It can be seen that the boxed connection structure simulated by this method can be used to evaluate the water impact resistance of adhesives / sealants for different bonding substrates, different connection structures and different weathering aging.

[0077] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable technicians familiar with the technical field to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent transformation or modification made according to the spirit and essence of the present invention should be included in the protection scope of the present invention. The technology, shape, and structure parts not described in detail in the present invention are all well-known technologies.

Claims

1. A high-speed water impact simulation test system, characterized in that: The invention comprises a test piece (6), a high-pressure water gun (7), and a water impact test device, wherein the water impact test device comprises a water gun fixing frame (8), a lifting platform (10), and a pressing plate (11); the test piece (6) is a box-shaped structure without a cover, and the outer edge of the bottom plate of the test piece (6) is bent upward and connected to the side plate of the test piece (6); the high-pressure water gun (7) is fixed on the water gun fixing frame (8) and can change the impact angle of the high-pressure water gun; the test piece (6) is arranged on the lifting platform (10), and the pressing plate (11) is arranged above the test piece (6) and can move up and down to fix the test piece.

2. A high-speed water impact simulation test system as claimed in claim 1, characterized in that: The outer edges of each side of the bottom plate are bent upwards, and the bent portion is located on the outer side of the side plate of the test piece (6).

3. A high-speed water impact simulation test system as claimed in claim 2, characterized in that: The upwardly bent portion of the bottom plate is sealed with the side plate on the corresponding side by using adhesive; or the upwardly bent portion of the bottom plate is sealed with the side plate on the corresponding side by using adhesive and fixed by a connecting piece (5).

4. A high-speed water impact simulation test system as claimed in claim 3, characterized in that: The folding height of each side of the bottom plate shall not be less than 10% of the height of the test piece (6), and the minimum folding height shall not be less than 10 mm. If the bending part is perforated, the folding height must not be less than 3 times the hole diameter in addition to meeting the above requirements.

5. A high-speed water impact simulation test system as claimed in claim 1, characterized in that: It also comprises a circulating water tank (12) for storing and collecting water sprayed by the high-pressure water gun (7); the circulating water tank (12) is an open container, and the water gun fixing frame (8) is arranged at the opening of the circulating water tank (12).

6. A high-speed water impact simulation test system as claimed in claim 1, characterized in that: It also includes a cylinder arranged on the water gun fixing frame (8), and the pressing plate (11) can move up and down under the drive of the cylinder.

7. A high-speed water impact simulation test system as claimed in claim 1, characterized in that: Both ends of at least one horizontal rod on the water gun fixing frame (8) are arranged in a slide groove (9), and the slide groove (9) has a horizontal section and a vertical section.

8. A high-speed water impact simulation test system as claimed in claim 7, characterized in that: The horizontal section and the vertical section of the slideway (9) are both provided with scales.

9. A method for testing using a high-speed water impact simulation test system as claimed in any one of claims 1 to 8, characterized in that: After the test piece is prepared, the box-shaped connection structure test piece (6) is placed on a lifting platform (10), and a high-pressure water gun (7) is fixed on a water gun fixing frame (8), with the outlet of the high-pressure water gun (7) facing the connection part of the bottom plate and the side plate of the test piece (6). The angle of the high-pressure water gun (7) is adjusted to the required test angle, and then the lifting platform (10) is adjusted so that the connection part of the bottom plate and the side plate of the test piece (6) is in a straight line with the impact direction of the high-pressure water gun (7). The pressing plate (11) is pressed down to fix the test piece (6), and the high-pressure water gun is turned on. The water impact test is performed according to the water flow rate and test time specified in the test.

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