CN115791606A - Stripping clamp suitable for interface stripping test and interface stripping test method - Google Patents
Stripping clamp suitable for interface stripping test and interface stripping test method Download PDFInfo
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- CN115791606A CN115791606A CN202211478361.8A CN202211478361A CN115791606A CN 115791606 A CN115791606 A CN 115791606A CN 202211478361 A CN202211478361 A CN 202211478361A CN 115791606 A CN115791606 A CN 115791606A
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Abstract
The invention discloses a stripping clamp suitable for an interface stripping test, which comprises a traction rope, a height controller, an angle controller and a clamp assembly, wherein the traction rope is connected with the height controller; the angle controller comprises a guide rail, a first upright post and a rotation limiting structure, wherein one end of the guide rail is rotatably connected with the upper end of the first upright post, and the rotation limiting structure is used for realizing rotation limiting of the guide rail relative to the first upright post; the clamp assembly clamps and peels off the test piece and mounts on guide rail; the height controller comprises a fixed pulley; one end of the traction rope is connected with the clamp assembly, and the other end of the traction rope is connected with the loading device by winding the fixed pulley; the loading device applies stripping load to the stripping material in the stripping test piece, and simultaneously drives the clamping material in the stripping test piece to move along the guide rail through the traction rope, so that the stripping of the stripping material and the clamping material in the stripping test piece is realized. The invention also discloses an interface peeling test method. The invention can meet the requirement of a stripping test of a continuous stripping angle and is beneficial to carrying out the stripping test on each interface of the solid rocket engine.
Description
Technical Field
The invention relates to a stripping clamp, in particular to a stripping clamp suitable for an interface stripping test of a combustion chamber of a solid rocket engine and an interface stripping test method, and belongs to the technical field of engine tests.
Background
In the field of safety research of solid engines, the exploration of interface performance is often complex and indispensable, a peeling test is an effective test means for evaluating and checking the interface performance of the engine, and the test method is that different special holders are arranged on a peeling tester according to different peeling angles required by the test, and then a loading device moves along a fixed direction to realize interface peeling. The special gripper in the test is a key device for realizing different stripping angles, so the special gripper is required to be capable of keeping an included angle between a stripped interface and a stripping load direction constant all the time and measuring the interface stripping performance under different stripping angles.
The existing stripping clamp generally adopts different special strippers according to different stripping angles, and the current common special strippers are a special clamp for 90-degree stripping and a special clamp for 180-degree stripping. Such a test apparatus is suitable for a peel test with a constant peel angle, but requires a different special stripper depending on the peel angle during the test, making the preparation work before the test cumbersome. And when the complex working condition peeling test of continuous angle peeling needs to be carried out on the test piece, the clamp special for 90-degree peeling and the clamp special for 180-degree peeling are not applicable any more.
Disclosure of Invention
The invention aims to overcome the defects and provides a stripping clamp suitable for an interface stripping test and an interface stripping test method, and solves the technical problems that the traditional stripping clamp cannot be suitable for a stripping test of a continuous stripping angle and a special stripping clamp needs to be continuously replaced.
In order to achieve the above purpose, the invention provides the following technical scheme:
the invention provides a novel stripping clamp holder aiming at a stripping test of a continuous angle, which mainly comprises a clamp assembly, an angle controller, a height controller, a traction rope and the like. The working principle is that a test piece is fixed by a clamp assembly, the included angle between the interface of the test piece and the peeling load is adjusted by using an angle controller, and then the position of a fixed pulley is changed by using a pulley height controller, so that the traction rope is parallel to the interface of the test piece. After the peeling test is started, the peeling material moves at a constant speed along the fixed direction, and the interface of the test piece is peeled. At the moment, the lower clamp is tensioned by the traction rope and moves on the guide rail, so that the included angle between the interface of the test piece and the stripping load is kept unchanged. After the test is finished, the clamp does not need to be taken down, the included angle between the test piece interface and the stripping load is further changed through the angle controller according to the requirement, and the position of the fixed pulley is changed through the pulley height controller, so that the traction rope is parallel to the test piece interface, and the next stripping test can be continuously carried out. The test of 0 degree peeling and 180 degrees peeling does not need the haulage rope, and the haulage rope only needs to be taken down before the test and then the test can.
The invention relates to a stripping clamp suitable for an interface stripping test, which comprises a traction rope, a height controller, an angle controller and a clamp assembly, wherein the traction rope is connected with the height controller;
the angle controller comprises a guide rail, a first upright post and a rotation limiting structure, wherein one end of the guide rail is rotatably connected with the upper end of the first upright post, and the rotation limiting structure is used for realizing rotation limiting of the guide rail relative to the first upright post;
the clamp assembly is arranged on the guide rail and used for clamping and stripping clamping materials in the test piece;
the height controller comprises a fixed pulley and a supporting mechanism for mounting the fixed pulley, and the height of the supporting mechanism is adjustable;
the first end of the traction rope is connected with the clamp assembly, and the second end of the traction rope rounds the fixed pulley and is connected with the loading device;
the loading device is arranged above the guide rail, exerts stripping load on the stripping material in the stripping test piece, and drives the clamping material in the stripping test piece to move along the guide rail through the traction rope, so that the stripping of the stripping material and the clamping material in the stripping test piece is realized.
Furthermore, the rotation limiting structure comprises a first bolt and a limiting block;
the limiting block is fixedly arranged at the upper end of the first upright post, an arc-shaped opening is formed in the limiting block, and the circle center corresponding to the arc-shaped opening is positioned on the rotating shaft when the guide rail rotates relative to the first upright post;
when the guide rail rotates to preset position relative to the first stand column, the first bolt is utilized to be fixedly connected with the guide rail through the arc-shaped opening, and meanwhile, the first bolt is clamped in the arc-shaped opening, so that the guide rail is limited relative to the rotation of the first stand column.
Furthermore, one end of the guide rail is connected with the upper end of the first upright post through a bearing.
Furthermore, a first upright post in the height controller and a supporting mechanism in the angle controller are both arranged on the frame of the testing machine.
Further, the supporting mechanism in the height controller comprises a shaft, a U-shaped structure, a second upright post and a second bolt;
the lower end of the second upright post is fixed on the frame of the testing machine, the U-shaped structure is arranged at the upper end of the second upright post through a second bolt, and the height of the U-shaped structure is adjusted by rotating the second bolt;
the U-shaped structure is opened upwards, and the fixed pulley is arranged in the U-shaped structure by a shaft.
Further, the part of the traction rope between the fixed pulley and the clamp assembly is parallel to the direction of the guide rail.
Further, the clamp assembly comprises an upper clamp, a lower clamp and a clamp hold-down bolt/nut; and the clamping material for stripping the test piece is arranged between the upper clamp and the lower clamp and is fixed by utilizing the clamp compression bolt.
An interface peeling test method is realized by adopting the peeling clamp, and comprises the following steps:
s1, clamping and stripping a clamping material in a test piece by using a clamp assembly;
s2, mounting the clamp assembly on the guide rail;
s3, connecting a first end of the traction rope with the clamp assembly, and connecting a second end of the traction rope with the loading device by bypassing the fixed pulley;
s4, adjusting the included angle between the guide rail and the stripping load applied by the loading device to be equal to a stripping angle theta (see figure 5), wherein theta is larger than 0 degree and smaller than 180 degrees, and realizing the rotation limiting of the guide rail relative to the first upright post by utilizing a rotation limiting structure;
s5, adjusting the height of the supporting mechanism to enable the part, located between the fixed pulley and the clamp assembly, of the traction rope to be parallel to the direction of the guide rail;
s6, applying a stripping load to the stripping material in the stripping test piece by the loading device, driving the clamping material in the stripping test piece to move along the guide rail through the traction rope, and stripping the stripping material in the stripping test piece and the clamping material at a stripping angle theta.
Further, the interface peeling test method further comprises the step of repeating the steps S1 to S6 to realize the peeling test of the next peeling angle.
An interface peeling test method is realized by adopting the peeling clamp, and comprises the following steps:
s1, clamping and stripping a clamping material in a test piece by using a clamp assembly;
s2, mounting the clamp assembly on the guide rail;
s3, adjusting an included angle between the guide rail and a stripping load applied by the loading device to be equal to a stripping angle theta, wherein theta =180 degrees or 0 degree;
and S4, applying a stripping load to the stripping material in the stripping test piece by the loading device, and stripping the stripping material in the stripping test piece and the clamping material at a preset stripping angle theta.
Compared with the prior art, the invention has at least one of the following beneficial effects:
(1) The invention creatively provides a stripping clamp holder, which can realize the stripping test requirement of continuous stripping angles by utilizing a stripping angle adjusting device and avoid the complicated work of replacing special clamp holders with different stripping angles;
(2) According to the invention, the test fixture suitable for composite materials and the like is designed according to the interface characteristics of the solid rocket engine combustion chamber, so that the stripping test of each interface of the solid rocket engine is facilitated;
(3) According to the invention, through the height controller and the traction rope, the traction test moves along the preset direction while the loading device applies a loading load, so that the peeling angle is ensured not to change;
(4) The invention designs a rotation limiting structure, and realizes stable rotation limiting of the guide rail by adopting a simple structure.
Drawings
FIG. 1 is a schematic view of the construction of the stripper clamp of the present invention; wherein, (a) is a side view, and (b) is a perspective view;
FIG. 2 is a schematic view of a clamp assembly of the present invention;
FIG. 3 is a schematic view of an angle controller according to the present invention;
FIG. 4 is a schematic view of the height controller of the present invention;
FIG. 5 is a schematic view of an interfacial peel test of the present invention;
FIG. 6 is a schematic view of the geometry of the components during height adjustment according to an embodiment of the present invention;
in the figure, 1-the tester frame; 2-a traction rope; 3-stripping the test piece; 5-a height controller; 6-an angle controller; 8-a clamp assembly; 9-a loading device;
81-upper clamp; 82-lower clamp; 83-clamp hold down bolt/nut; 31-a clamping material; 32-a release material;
61-a guide rail; 62-a rotation limiting structure; 63-a first upright; 64-a bearing; 65-a first bolt;
51-axis; a 52-U-shaped structure; 53-a second upright; 54-a second bolt; 55-fixed pulley.
Detailed Description
The features and advantages of the present invention will become more apparent and appreciated from the following detailed description of the invention.
The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
The existing 90-degree stripping special clamp and 180-degree stripping special clamp cannot be suitable for stripping tests of continuous stripping angles, and the stripping special clamp needs to be continuously replaced according to different test requirements. In order to overcome the technical problem, the invention adopts the stripping clamp device with the angle controller and the pulley height controller, and the stripping clamp device is matched with the adjustment of the height of the fixed pulley and the clamp assembly suitable for clamping composite materials and the like in a mode of adjusting the included angle between the interface of a test piece and a stripping load in the test, so that the problem of continuously controllable stripping angle is solved, and the damage to the test piece of the engine interface in the test is avoided.
The structural design of the stripping tester is shown in figure 1, a stripping clamp capable of adjusting a stripping angle is arranged on a tester frame 1, the stripping clamp is adjusted before an interface stripping test, so that a certain included angle is formed between a test piece interface and a stripping load direction, a loading device is started to carry out the stripping test, and the interface stripping test of any stripping angle can be completed.
The stripping clamp structure of the stripping tester is shown in fig. 2 and comprises an angle controller 6, a height controller 5, a traction rope 2, a clamp assembly 8 and the like.
The jig assembly 8 is composed of an upper jig 81, a lower jig 82, and a jig hold-down bolt/nut 83, as shown in fig. 3, and is used to hold down the peeling test piece 3, the peeling test piece 3 including the holding material 31 and the peeling material 32. A certain gap is left between the upper clamp and the lower clamp, and the test piece is firmly fixed by screwing the compression bolt and the nut.
The angle controller 6 is composed of a guide rail 61, a rotation limiting structure 62, a first upright post 63 and a bearing 64, wherein the rotation limiting structure 62 comprises a first bolt 65 and a limiting block provided with an arc-shaped opening, as shown in fig. 4, the bearing 64 is used for connecting the guide rail 61 and the first upright post 63, and the arc-shaped opening is matched with the bolt to control the angle theta.
The height controller 5 is composed of a shaft 51, a U-shaped structure 52, a second upright 53, and a second bolt 54, and is used to adjust the height of the fixed pulley 55 as shown in fig. 5, where P is a peeling load and θ is a peeling angle in fig. 5. One end of the traction rope 2 on the fixed pulley 55 is connected with the loading device 9, and the loading device 9 exerts a tensioning effect on the traction rope 2; one end of the lower clamp 82 is connected, tensile force generated by the loading device 9 is transmitted to the lower clamp 82 through the traction rope 2, and the lower clamp 82 is pulled to slide along the guide rail 61.
Before the test, the stripping test piece 3 is fixed and installed on the guide rail 61 through the clamp assembly 8, and the angle controller 6 and the height controller 5 are adjusted, so that the guide rail 61 (test piece interface) and the traction rope 2 are parallel to each other and form a fixed included angle (stripping angle) with the stripping load direction. In the test, the traction rope 2 is pulled by the loading device 9, and the lower clamp 82 is pulled by the fixed pulley 55 to move along the guide rail 61. The distance that the lower clamp 82 moves is consistent with the height at which the release material 32 is pulled (i.e., the distance that the loading device 9 moves), achieving that the release angle remains constant during the test. For the 0 degree peel and 180 degree peel tests, the traction rope 2 is not needed, and the traction rope is taken down before the tests and then the tests are carried out.
The test device has the advantages that: (1) The peeling angle adjusting device is added, so that the requirements of any peeling angle can be tested, the requirements of testing different interface performances of the engine can be met, special clamping devices do not need to be replaced according to different peeling angles, and complicated work of preparation tests is avoided. (2) According to the characteristics of the solid rocket engine combustion chamber interface, the test fixture which can not damage composite materials and the like is designed, and the peeling test of each interface of the solid rocket engine is facilitated.
Example 1:
an interface peel test method comprising the steps of:
s1, transporting a testing machine frame, a loading device, an angle controller, a height controller and the like to a testing field;
s2, mounting a platform of the testing machine frame on a ground bolt of the ground of the testing field;
s3, completing the installation of the test loading device;
s4, mounting the stripping test piece between the upper clamp and the lower clamp, and fixing and pressing the upper clamp and the lower clamp through clamp pressing bolts/nuts;
s5, assembling the lower clamp on the guide rail;
s6, adjusting an angle controller to enable a guide rail (a test piece interface) and the stripping load direction to form a fixed included angle theta (a stripping angle);
s7, adjusting the height controller to enable the traction rope and the guide rail (test piece interface) to form a fixed included angle theta.
S8, starting the loading device to complete the peeling test;
s9, repeating the steps S4-S8, and realizing the peeling test of any peeling angle;
and S10-degree stripping and 180-degree stripping tests are carried out, a traction rope is not needed, and the traction rope is taken down before the tests and then the tests are carried out.
Example 2
First, θ is measured 0 The state at =90 ° is set as the reference state. The peeling angle is theta =120 degrees, the distance between the angle controller upright post and the height controller upright post is l =100mm, and the average peeling tensile load is
Maximum peel load P max =0.3N, minimum peel load P max For example, =0.1N and the interface width b =25mm of the test piece, the test procedure will be described:
(1) The height of the fixed pulley is adjusted to be h = ltan (theta-theta) from the reference state 0 ) =57.74mm, the geometrical relationship is shown in fig. 6. In fig. 6, assuming that the spatial position of the projection intersection point of the section a of the pulling rope and the extension line of the clamping material is unchanged, l is specifically defined as the distance between the section a of the pulling rope and the projection intersection point of the axis of the height controller and the axis of the stripping section of the stripping test piece in the reference state, and h is the position movement distance of the projection intersection point of the section a of the pulling rope and the axis of the height controller.
It should be noted that, in practice, the bearing 64 is used as a rotating shaft of the angle controller, the position of the bearing is unchanged, and the spatial position of the projection intersection point of the segment a of the hauling rope and the extension line of the clamping material changes with different stripping angles; similarly, the relative position of the intersection of the section a of the pull-cord with the projection of the height controller axis and the shaft 51 is also not constant. This example is somewhat simplified.
(2) Peeling the release material from the adhesive substrate at a constant speed;
(3) Recording the tensile force P and the peeling distance L when the peeling reaches a stable state in the test, and taking the interface length of the test piece from the beginning to the end of the stable state of the tensile force as the effective peeling length L of the peeling test P ；
(4) For maximum peeling load P in effective peeling range max And minimum peel load P min Recording is performed and the average peel load of the effective peel portion is calculated
(5) The bonding energy of the interface can be obtained by the following formula:
wherein b is the width of the interface of the tested piece.
Respectively calculating the average bonding energy, the maximum bonding energy and the minimum bonding energy of the interface according to the average peeling load, the maximum peeling load and the minimum peeling load:
average bonding energy
Maximum bonding energy
Minimum binding energy
In a solid engine interface stripping performance test, when the engine interface performance is measured, the stripping clamp can change the included angle between the stripping load direction and the test piece interface through the angle controller, and further measure the stripping performance of the engine interface under any stripping angle.
The invention has been described in detail with reference to specific embodiments and illustrative examples, but the description is not intended to be construed in a limiting sense. Those skilled in the art will appreciate that various equivalent substitutions, modifications or improvements may be made to the technical solution of the present invention and its embodiments without departing from the spirit and scope of the present invention, which fall within the scope of the present invention. The scope of the invention is defined by the appended claims.
Those skilled in the art will appreciate that those matters not described in detail in the present specification are well known in the art.
Claims (10)
1. A stripping clamp holder suitable for an interface stripping test is characterized by comprising a traction rope (2), a height controller (5), an angle controller (6) and a clamp assembly (8);
the angle controller (6) comprises a guide rail (61), a first upright post (63) and a rotation limiting structure (62), one end of the guide rail (61) is rotatably connected with the upper end of the first upright post (63), and the rotation limiting structure (62) is used for realizing rotation limiting of the guide rail (61) relative to the first upright post (63);
the clamp assembly (8) is arranged on the guide rail (61), and the clamp assembly (8) is used for clamping and stripping the clamping material (31) in the test piece (3);
the height controller (5) comprises a fixed pulley (55) and a supporting mechanism for mounting the fixed pulley (55), and the height of the supporting mechanism is adjustable;
the first end of the traction rope (2) is connected with the clamp assembly (8), and the second end of the traction rope (2) is connected with the loading device (9) by passing through the fixed pulley (55);
the loading device (9) is arranged above the guide rail (61), the loading device (9) applies stripping load to the stripping material (32) in the stripping test piece (3), and meanwhile the traction rope (2) drives the clamping material (31) in the stripping test piece (3) to move along the guide rail (61), so that the stripping of the stripping material (31) and the clamping material (32) in the stripping test piece (3) is realized.
2. The stripper clamp adapted for interfacial stripping testing of claim 1, wherein the rotation limiting structure (62) comprises a first bolt (65) and a limiting block;
the limiting block is fixedly arranged at the upper end of the first upright post (63), an arc-shaped opening is formed in the limiting block, and the circle center corresponding to the arc-shaped opening is positioned on the rotating shaft when the guide rail (61) rotates relative to the first upright post (63);
when the guide rail (61) rotates to a preset position relative to the first upright post (63), the first bolt (65) is fixedly connected with the guide rail (61) through the arc-shaped opening, and meanwhile, the first bolt (65) is clamped in the arc-shaped opening, so that the rotation limiting of the guide rail (61) relative to the first upright post (63) is realized.
3. Stripping gripper suitable for interfacial peeling tests according to claim 2, characterized in that one end of the guide rail (61) is connected to the upper end of the first upright (63) by means of a bearing (64).
4. The stripper clamp suitable for the interfacial stripping test according to claim 1, wherein the first upright (63) of the height controller (5) and the support mechanism of the angle controller (6) are mounted on the frame (1) of the testing machine.
5. Stripping gripper suitable for interfacial stripping tests according to claim 4, characterized in that the support mechanism in the height controller (5) comprises a shaft (51), a U-shaped structure (52), a second upright (53) and a second bolt (54);
the lower end of the second upright post (53) is fixed on the testing machine frame (1), the U-shaped structure (52) is installed at the upper end of the second upright post (53) through a second bolt (54), and the height of the U-shaped structure (52) is adjusted by rotating the second bolt (54);
the U-shaped structure (52) is opened upward, and the fixed pulley (55) is mounted in the U-shaped structure (52) by a shaft (51).
6. The stripper clamp adapted for interfacial stripping tests according to claim 1, wherein the portion of the pull-cord (2) between the crown block (55) and the clamp assembly (8) is parallel to the direction of the guide rail (61).
7. The stripper clamp adapted for interfacial stripping testing of claim 1, wherein the clamp assembly (8) comprises an upper clamp (81), a lower clamp (82), and a clamp hold-down bolt/nut (83); the holding material of the peeling test piece (3) is placed between an upper jig (81) and a lower jig (82), and fixed by a jig hold-down bolt (83).
8. An interfacial peel test method, which is carried out using the peel gripper according to any one of claims 1 to 7, comprising:
s1, clamping and stripping a clamping material (31) in a test piece (3) by using a clamp assembly (8);
s2, mounting the clamp assembly (8) on the guide rail (61);
s3, connecting a first end of the traction rope (2) with the clamp assembly (8), and connecting a second end of the traction rope (2) with the loading device (9) by passing through the fixed pulley (55);
s4, adjusting an included angle between the guide rail (61) and a stripping load applied by the loading device (9) to be equal to a stripping angle theta, wherein theta is more than 0 degree and less than 180 degrees, and realizing rotation limiting of the guide rail (61) relative to the first upright post (63) by utilizing a rotation limiting structure (62);
s5, adjusting the height of the supporting mechanism to enable the part, located between the fixed pulley (55) and the clamp assembly (8), of the traction rope (2) to be parallel to the direction of the guide rail (61);
s6, the loading device (9) applies stripping load to the stripping material (32) in the stripping test piece (3), meanwhile, the traction rope (2) drives the clamping material (31) in the stripping test piece (3) to move along the guide rail (61), and the stripping material (32) in the stripping test piece (3) is stripped from the clamping material (31) at a stripping angle theta.
9. The method of claim 8, further comprising repeating steps S1-S6 to perform a peel test at a next peel angle.
10. An interfacial peel test method, carried out using the peel gripper of any one of claims 1-7, comprising:
s1, clamping and stripping a clamping material (31) in a test piece (3) by using a clamp assembly (8);
s2, mounting the clamp assembly (8) on the guide rail (61);
s3, adjusting the included angle between the guide rail (61) and the peeling load applied by the loading device (9) to be equal to a peeling angle theta, wherein theta =180 degrees or 0 degrees;
s4, the loading device (9) applies stripping load to the stripping material (32) in the stripping test piece (3), and the stripping material (32) in the stripping test piece (3) is stripped from the clamping material (31) at a preset stripping angle theta.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211478361.8A CN115791606A (en) | 2022-11-23 | 2022-11-23 | Stripping clamp suitable for interface stripping test and interface stripping test method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211478361.8A CN115791606A (en) | 2022-11-23 | 2022-11-23 | Stripping clamp suitable for interface stripping test and interface stripping test method |
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| CN115791606A true CN115791606A (en) | 2023-03-14 |
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| CN202211478361.8A Pending CN115791606A (en) | 2022-11-23 | 2022-11-23 | Stripping clamp suitable for interface stripping test and interface stripping test method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117433985A (en) * | 2023-08-24 | 2024-01-23 | 苏州尚实豪精密机械科技有限公司 | Adhesive force testing jig |
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2022
- 2022-11-23 CN CN202211478361.8A patent/CN115791606A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117433985A (en) * | 2023-08-24 | 2024-01-23 | 苏州尚实豪精密机械科技有限公司 | Adhesive force testing jig |
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